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Abrosimov SV, Protsenko BO, Mannaa AS, Vlasenko VG, Guda SA, Pankin IA, Burlov AS, Koshchienko YV, Guda AA, Soldatov AV. Improving sensitivity of XANES structural fit to the bridged metal-metal coordination. J Synchrotron Radiat 2024; 31:S1600577524002091. [PMID: 38530834 DOI: 10.1107/s1600577524002091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Accepted: 03/03/2024] [Indexed: 03/28/2024]
Abstract
Hard X-ray absorption spectroscopy is a valuable in situ probe for non-destructive diagnostics of metal sites. The low-energy interval of a spectrum (XANES) contains information about the metal oxidation state, ligand type, symmetry and distances in the first coordination shell but shows almost no dependency on the bridged metal-metal bond length. The higher-energy interval (EXAFS), on the contrary, is more sensitive to the coordination numbers and can decouple the contribution from distances in different coordination shells. Supervised machine-learning methods can combine information from different intervals of a spectrum; however, computational approaches for the near-edge region of the spectrum and higher energies are different. This work aims to keep all benefits of XANES and extend its sensitivity towards the interatomic distances in the first and second coordination shells. Using a binuclear bridged copper complex as a case study and cross-validation analysis as a quantitative tool it is shown that the first 170 eV above the edge are already sufficient to balance the contributions of Cu-O/N scattering and Cu-Cu scattering. As a more general outcome this work highlights the trivial but often overlooked importance of using `longer' energy intervals of XANES for structural refinement and machine-learning predictions. The first 200 eV above the absorption edge still do not require parametrization of Debye-Waller damping and can be calculated within full multiple scattering or finite difference approximations with only moderately increased computational costs.
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Affiliation(s)
- S V Abrosimov
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russian Federation
| | - B O Protsenko
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russian Federation
| | - A S Mannaa
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russian Federation
| | - V G Vlasenko
- Institute of Physics, Southern Federal University, Stachki Ave 194, 344090 Rostov-on-Don, Russian Federation
| | - S A Guda
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russian Federation
| | - I A Pankin
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russian Federation
| | - A S Burlov
- Institute of Physical and Organic Chemistry, Stachki Ave 194/2, 344090 Rostov-on-Don, Russian Federation
| | - Y V Koshchienko
- Institute of Physical and Organic Chemistry, Stachki Ave 194/2, 344090 Rostov-on-Don, Russian Federation
| | - A A Guda
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russian Federation
| | - A V Soldatov
- The Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russian Federation
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Bishop BA, Alam MS, Flynn SL, Chen N, Hao W, Ramachandran Shivakumar K, Swaren L, Gutierrez Rueda D, Konhauser KO, Alessi DS, Robbins LJ. Rare Earth Element Adsorption to Clay Minerals: Mechanistic Insights and Implications for Recovery from Secondary Sources. Environ Sci Technol 2024; 58:7217-7227. [PMID: 38588505 DOI: 10.1021/acs.est.4c00974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
The energy transition will have significant mineral demands and there is growing interest in recovering critical metals, including rare earth elements (REE), from secondary sources in aqueous and sedimentary environments. However, the role of clays in REE transport and deposition in these settings remains understudied. This work investigated REE adsorption to the clay minerals illite and kaolinite through pH adsorption experiments and extended X-ray absorption fine structure (EXAFS). Clay type, pH, and ionic strength (IS) affected adsorption, with decreased adsorption under acidic pH and elevated IS. Illite had a higher adsorption capacity than kaolinite; however, >95% adsorption was achieved at pH ∼7.5 regardless of IS or clay. These results were used to develop a surface complexation model with the derived binding constants used to predict REE speciation in the presence of competing sorbents. This demonstrated that clays become increasingly important as pH increases, and EXAFS modeling showed that REE can exist as both inner- and outer-sphere complexes. Together, this indicated that clays can be an important control on the transport and enrichment of REE in sedimentary systems. These findings can be applied to identify settings to target for resource extraction or to predict REE transport and fate as a contaminant.
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Affiliation(s)
- Brendan A Bishop
- Department of Geology, University of Regina, 3737 Wascana Parkway, Regina, Saskatchewan S4S 0A2, Canada
| | - Md Samrat Alam
- Geological Survey of Canada, Natural Resources Canada, Québec, Quebec G1K 9A9, Canada
| | - Shannon L Flynn
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom
| | - Ning Chen
- Canadian Light Source Inc., University of Saskatchewan, 114 Science Place, Saskatoon, Saskatchewan S7N 0X4, Canada
| | - Weiduo Hao
- State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environment, Department of Geology, Northwest University, Xi'an 710069, P. R. China
- Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, Alberta T6G 2E3, Canada
| | - Karthik Ramachandran Shivakumar
- Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, Alberta T6G 2E3, Canada
| | - Logan Swaren
- Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, Alberta T6G 2E3, Canada
| | - Daniela Gutierrez Rueda
- Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, Alberta T6G 2E3, Canada
| | - Kurt O Konhauser
- Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, Alberta T6G 2E3, Canada
| | - Daniel S Alessi
- Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, Alberta T6G 2E3, Canada
| | - Leslie J Robbins
- Department of Geology, University of Regina, 3737 Wascana Parkway, Regina, Saskatchewan S4S 0A2, Canada
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Yuan B, Lin L, Li H, Ke Y, He L, Lu H, Liu J, Hong H, Yan C. Immobilization mechanisms of Sr(II), Ni(II), and Cd(II) on glomalin-related soil protein in mangrove sediments at the microscopic scale. Environ Res 2024; 252:118793. [PMID: 38552828 DOI: 10.1016/j.envres.2024.118793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 03/12/2024] [Accepted: 03/24/2024] [Indexed: 04/02/2024]
Abstract
Glomalin-related soil protein (GRSP) is a significant component in the sequestration of heavy metal in soils, but its mechanisms for metal adsorption are poorly known. This study combined spectroscopic data with molecular docking simulations to reveal metal adsorption onto GRSP's surface functional groups at the molecular level. The EXAFS combined with FTIR and XPS analyses indicated that the adsorption of Cd(II), Sr(II), and Ni(II) by GRSP occurred mainly through the coordination of -OH and -COOH groups with the metal. The -COOH and -OH groups bound to the metal as electron donors and the electron density of the oxygen atom decreased, suggesting that electrostatic attraction might be involved in the adsorption process. Two-dimensional correlation spectroscopy revealed that preferential adsorption occurred on GRSP for the metal in sequential order of -COOH groups followed by -OH groups. The presence of the Ni-C shell in the Ni EXAFS spectrum suggested that Ni formed organometallic complexes with the GRSP surface. However, Sr-C and Cd-C were absent in the second shell of the Sr and Cd spectra, which was attributed to the adsorption of Sr and Cd ions with large hydration ion radius by GRSP to form outer-sphere complexes. Through molecular docking simulations, negatively charged residues such as ASP151 and ASP472 in GRSP were found to provide electrostatic attraction and ligand combination for the metal adsorption, which was consistent with the spectroscopic analyses. Overall, these findings provided new insights into the interaction mechanisms between GRSP and metals, which will help deepen our understanding of the ecological functions of GRSP in metal sequestration.
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Affiliation(s)
- Bo Yuan
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, PR China
| | - Lujian Lin
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, PR China
| | - Hanyi Li
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, PR China
| | - Yue Ke
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, PR China
| | - Le He
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, PR China
| | - Haoliang Lu
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, PR China
| | - Jingchun Liu
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, PR China
| | - Hualong Hong
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, PR China.
| | - Chongling Yan
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, PR China; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361102, PR China.
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Lopez-Astacio H, Vargas-Perez BL, Del Valle-Perez A, Pollock CJ, Cunci L. Open-source electrochemical cell for in situ X-ray absorption spectroscopy in transmission and fluorescence modes. J Synchrotron Radiat 2024; 31:322-327. [PMID: 38306299 PMCID: PMC10914171 DOI: 10.1107/s1600577524000122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Accepted: 01/04/2024] [Indexed: 02/04/2024]
Abstract
X-ray spectroscopy is a valuable technique for the study of many materials systems. Characterizing reactions in situ and operando can reveal complex reaction kinetics, which is crucial to understanding active site composition and reaction mechanisms. In this project, the design, fabrication and testing of an open-source and easy-to-fabricate electrochemical cell for in situ electrochemistry compatible with X-ray absorption spectroscopy in both transmission and fluorescence modes are accomplished via windows with large opening angles on both the upstream and downstream sides of the cell. Using a hobbyist computer numerical control machine and free 3D CAD software, anyone can make a reliable electrochemical cell using this design. Onion-like carbon nanoparticles, with a 1:3 iron-to-cobalt ratio, were drop-coated onto carbon paper for testing in situ X-ray absorption spectroscopy. Cyclic voltammetry of the carbon paper showed the expected behavior, with no increased ohmic drop, even in sandwiched cells. Chronoamperometry was used to apply 0.4 V versus reversible hydrogen electrode, with and without 15 min of oxygen purging to ensure that the electrochemical cell does not provide any artefacts due to gas purging. The XANES and EXAFS spectra showed no differences with and without oxygen, as expected at 0.4 V, without any artefacts due to gas purging. The development of this open-source electrochemical cell design allows for improved collection of in situ X-ray absorption spectroscopy data and enables researchers to perform both transmission and fluorescence simultaneously. It additionally addresses key practical considerations including gas purging, reduced ionic resistance and leak prevention.
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Affiliation(s)
- Hiram Lopez-Astacio
- Department of Chemistry and Physics, Universidad Ana G. Mendez at Gurabo, Gurabo, Puerto Rico, USA
| | - Brenda Lee Vargas-Perez
- Department of Chemistry, University of Puerto Rico at Rio Piedras, San Juan, Puerto Rico, USA
| | - Angelica Del Valle-Perez
- Department of Chemistry and Physics, Universidad Ana G. Mendez at Gurabo, Gurabo, Puerto Rico, USA
- Department of Chemistry, University of Puerto Rico at Rio Piedras, San Juan, Puerto Rico, USA
| | - Christopher J. Pollock
- Cornell High Energy Synchrotron Source, Wilson Laboratory, Cornell University, Ithaca, NY 14853, USA
| | - Lisandro Cunci
- Department of Chemistry, University of Puerto Rico at Rio Piedras, San Juan, Puerto Rico, USA
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Warmuth L, Steurer M, Schild D, Zimina A, Grunwaldt JD, Pitter S. Reversible and Irreversible Structural Changes in Cu/ZnO/ZrO 2 Catalysts during Methanol Synthesis. ACS Appl Mater Interfaces 2024; 16:8813-8821. [PMID: 38335022 DOI: 10.1021/acsami.3c17383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
The structure and chemical state of heterogeneous catalysts are closely related to their operational stability. Knowing these relationships as precisely as possible is thus essential for further catalyst development. This work focuses on the deactivation of a Cu/ZnO/ZrO2-type catalyst for methanol synthesis. Experiments were performed in a parallel setup, with which time-dependent changes in the catalyst material can be observed. Elucidation of potential deactivation pathways is described for catalyst aging at different times on stream (0, 50, 935 h). Data from X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, N2 physisorption, and transmission electron microscopy measurements reveal that sintering of Cu0 domains and restructuring within ZnO domains mainly contribute to deactivation. Subsequent reactivation by reduction (in H2/N2) reverts the observed structural changes only to a limited extent. Moreover, this work highlights the participation of ZrO2 as a promoter and reveals redispersion of zirconia after initial reduction.
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Affiliation(s)
- Lucas Warmuth
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
| | - Matthias Steurer
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
| | - Dieter Schild
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
| | - Anna Zimina
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
| | - Jan-Dierk Grunwaldt
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
| | - Stephan Pitter
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
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Ekanayake RSK, Streltsov VA, Best SP, Chantler CT. Using XAS to monitor radiation damage in real time and post-analysis, and investigation of systematic errors of fluorescence XAS for Cu-bound amyloid-β. J Appl Crystallogr 2024; 57:125-139. [PMID: 38322727 PMCID: PMC10840304 DOI: 10.1107/s1600576723010890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 12/20/2023] [Indexed: 02/08/2024] Open
Abstract
X-ray absorption spectroscopy (XAS) is a promising technique for determining structural information from sensitive biological samples, but high-accuracy X-ray absorption fine structure (XAFS) requires corrections of systematic errors in experimental data. Low-temperature XAS and room-temperature X-ray absorption spectro-electrochemical (XAS-EC) measurements of N-truncated amyloid-β samples were collected and corrected for systematic effects such as dead time, detector efficiencies, monochromator glitches, self-absorption, radiation damage and noise at higher wavenumber (k). A new protocol was developed using extended X-ray absorption fine structure (EXAFS) data analysis for monitoring radiation damage in real time and post-analysis. The reliability of the structural determinations and consistency were validated using the XAS measurement experimental uncertainty. The correction of detector pixel efficiencies improved the fitting χ2 by 12%. An improvement of about 2.5% of the structural fitting was obtained after dead-time corrections. Normalization allowed the elimination of 90% of the monochromator glitches. The remaining glitches were manually removed. The dispersion of spectra due to self-absorption was corrected. Standard errors of experimental measurements were propagated from pointwise variance of the spectra after systematic corrections. Calculated uncertainties were used in structural refinements for obtaining precise and reliable values of structural parameters including atomic bond lengths and thermal parameters. This has permitted hypothesis testing.
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Affiliation(s)
| | - Victor A. Streltsov
- School of Physics, University of Melbourne, Australia
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Australia
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Usoltsev O, Tereshchenko A, Skorynina A, Kozyr E, Soldatov A, Safonova O, Clark AH, Ferri D, Nachtegaal M, Bugaev A. Machine Learning for Quantitative Structural Information from Infrared Spectra: The Case of Palladium Hydride. Small Methods 2024:e2301397. [PMID: 38295064 DOI: 10.1002/smtd.202301397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 01/09/2024] [Indexed: 02/02/2024]
Abstract
Infrared spectroscopy (IR) is a widely used technique enabling to identify specific functional groups in the molecule of interest based on their characteristic vibrational modes or the presence of a specific adsorption site based on the characteristic vibrational mode of an adsorbed probe molecule. The interpretation of an IR spectrum is generally carried out within a fingerprint paradigm by comparing the observed spectral features with the features of known references or theoretical calculations. This work demonstrates a method for extracting quantitative structural information beyond this approach by application of machine learning (ML) algorithms. Taking palladium hydride formation as an example, Pd-H pressure-composition isotherms are reconstructed using IR data collected in situ in diffuse reflectance using CO molecule as a probe. To the best of the knowledge, this is the first example of the determination of continuous structural descriptors (such as interatomic distance and stoichiometric coefficient) from the fine structure of vibrational spectra, which opens new possibilities of using IR spectra for structural analysis.
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Affiliation(s)
- Oleg Usoltsev
- ALBA Synchrotron, Cerdanyola del Valles, Barcelona, 08290, Spain
| | | | - Alina Skorynina
- ALBA Synchrotron, Cerdanyola del Valles, Barcelona, 08290, Spain
| | | | - Alexander Soldatov
- Southern Federal University, Sladkova 178/24, Rostov-on-Don, 344090, Russia
| | - Olga Safonova
- Paul Scherrer Institute, Forschungsstrasse 111, Villigen, 5232, Switzerland
| | - Adam H Clark
- Paul Scherrer Institute, Forschungsstrasse 111, Villigen, 5232, Switzerland
| | - Davide Ferri
- Paul Scherrer Institute, Forschungsstrasse 111, Villigen, 5232, Switzerland
| | - Maarten Nachtegaal
- Paul Scherrer Institute, Forschungsstrasse 111, Villigen, 5232, Switzerland
| | - Aram Bugaev
- Paul Scherrer Institute, Forschungsstrasse 111, Villigen, 5232, Switzerland
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Jessat I, Foerstendorf H, Rossberg A, Scheinost AC, Lützenkirchen J, Heim K, Stumpf T, Jordan N. Unraveling the Np(V) sorption on ZrO 2: A batch, spectroscopic and modeling combined approach. J Hazard Mater 2024; 461:132168. [PMID: 37742379 DOI: 10.1016/j.jhazmat.2023.132168] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 07/25/2023] [Accepted: 07/26/2023] [Indexed: 09/26/2023]
Abstract
The interactions of the long-lived actinide neptunium with the corrosion product zirconia (ZrO2) have to be considered in the safety assessment of a repository for radioactive waste. The sorption of Np(V) on ZrO2 was investigated in the absence of carbonate at the macroscopic and molecular scale. At the macroscopic level, the Np(V) uptake was independent of ionic strength and the isoelectric point of the pristine zirconia was increased, both suggesting the presence of inner-sphere Np(V) surface complexes. The Np(V) sorption isotherms indicated the presence of strong and weak sorption sites. Molecular level information were derived from in situ attenuated total reflection Fourier-transform infrared spectroscopy and extended X-ray absorption fine structure spectroscopy (EXAFS), which confirmed the presence of Np(V) inner-sphere complexes. EXAFS experiments revealed the formation of a bidentate inner-sphere surface complex in the weak sorption site regime. The derived information at the macroscopic and molecular levels were used to parametrize a charge distribution multi-site complexation (CD-MUSIC) model. The derived thermodynamic constants can help to better predict the environmental fate of Np(V) in the context of nuclear waste repository assessments and can also support the appraisal of safety-relevant scenarios for the extended interim storage of spent nuclear fuel.
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Affiliation(s)
- Isabelle Jessat
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Harald Foerstendorf
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - André Rossberg
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany; The Rossendorf Beamline (BM20), European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38043 Grenoble, France
| | - Andreas C Scheinost
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany; The Rossendorf Beamline (BM20), European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38043 Grenoble, France
| | - Johannes Lützenkirchen
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Karsten Heim
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Thorsten Stumpf
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Norbert Jordan
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany.
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Gornakova AS, Kabirova DB, Korneva A, Straumal B, Imayev MF, Kuzmin A, Czaja P, Afonikova NS, Orlov VI, Nekrasov AN, Khayretdinov NF, Davdian G. Effect of High-Pressure Torsion on Phase Formation and Mechanical Properties of a High-Entropy TiZrHfMoCrCo Alloy. Materials (Basel) 2023; 16:7558. [PMID: 38138700 PMCID: PMC10744940 DOI: 10.3390/ma16247558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Revised: 12/05/2023] [Accepted: 12/06/2023] [Indexed: 12/24/2023]
Abstract
This investigation delved into the alterations in the mechanical properties of a TiZrHfMoCrCo high-entropy alloy due to phase transformations induced by high-pressure torsion (HPT). The alloy's genesis involved levitation melting within an argon atmosphere, presenting two distinct states for analysis: the initial, post-manufacturing state and the state subsequent to HPT treatment. The original alloy featured a composition comprising a singular A2 phase with a bcc lattice and two Laves phases, C15 and C14. The HPT process triggered significant phase modifications: a retention of one C15 Laves phase and decomposition of the bcc phase into two distinct phases exhibiting different bcc lattice parameters. The HPT-induced effect prominently manifests as strong grain refinement. However, scanning electron microscopy (SEM) observations unveiled persistent inhomogeneities at a micron scale both before and after HPT treatment. Thus, grain refinement occurs separately within each of the bcc and Laves phases, visible in the light, dark, and gray areas in SEM images, while mixing does not occur on the scale of several microns. The examination of Ti, Cr, Co, Zr, Mo, and Hf via X-ray absorption spectroscopy (EXAFS) at specific K-edges and L3-edge revealed that the HPT treatment conserves the local atomic environment of metal atoms, albeit with a slight elevation in static disorder. Assessments through microhardness and three-point bending tests demonstrated the material's inherent hardness and brittleness. The microhardness, standing at a substantial value of 600 HV, displayed negligible augmentation post-HPT. However, the microhardness of individual phases exhibited a notable alteration, nearly doubling in magnitude.
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Affiliation(s)
- Alena S. Gornakova
- Osipyan Institute of Solid State Physics of the Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, Russia; (A.S.G.); (N.S.A.); (V.I.O.); (G.D.)
| | - Dilara B. Kabirova
- Institute for Metals Superplasticity Problems of Russian Academy of Sciences, Stepan Khalturin Str. 39, 450001 Ufa, Russia; (D.B.K.); (M.F.I.); (N.F.K.)
| | - Anna Korneva
- Institute of Metallurgy and Materials Science Polish Academy of Sciences, Reymonta Str. 25, 30-059 Cracow, Poland; (A.K.); (P.C.)
| | - Boris Straumal
- Osipyan Institute of Solid State Physics of the Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, Russia; (A.S.G.); (N.S.A.); (V.I.O.); (G.D.)
- Department of Physical Chemistry, National University of Science and Technology “MISIS”, Leninsky Avenue 4, 119991 Moscow, Russia
| | - Marcel F. Imayev
- Institute for Metals Superplasticity Problems of Russian Academy of Sciences, Stepan Khalturin Str. 39, 450001 Ufa, Russia; (D.B.K.); (M.F.I.); (N.F.K.)
| | - Alexei Kuzmin
- Institute of Solid State Physics, University of Latvia, Kengaraga Str. 8, LV-1063 Riga, Latvia;
| | - Paweł Czaja
- Institute of Metallurgy and Materials Science Polish Academy of Sciences, Reymonta Str. 25, 30-059 Cracow, Poland; (A.K.); (P.C.)
| | - Natalia S. Afonikova
- Osipyan Institute of Solid State Physics of the Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, Russia; (A.S.G.); (N.S.A.); (V.I.O.); (G.D.)
| | - Valeriy I. Orlov
- Osipyan Institute of Solid State Physics of the Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, Russia; (A.S.G.); (N.S.A.); (V.I.O.); (G.D.)
| | - Alexei N. Nekrasov
- Korzhinskii Institute of Experimental Mineralogy of the Russian Academy of Sciences, Ac. Osipyan Str. 4, 142432 Chernogolovka, Russia;
| | - Nafis F. Khayretdinov
- Institute for Metals Superplasticity Problems of Russian Academy of Sciences, Stepan Khalturin Str. 39, 450001 Ufa, Russia; (D.B.K.); (M.F.I.); (N.F.K.)
| | - Gregory Davdian
- Osipyan Institute of Solid State Physics of the Russian Academy of Sciences, Ac. Osipyan Str. 2, 142432 Chernogolovka, Russia; (A.S.G.); (N.S.A.); (V.I.O.); (G.D.)
- Department of Physical Chemistry, National University of Science and Technology “MISIS”, Leninsky Avenue 4, 119991 Moscow, Russia
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10
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Yang B, Rashid S, Graham N, Li G, Yu W. In-depth study of the removal of Mn(II) by Fe(VI) treatment and the profound influence of NOM on floc formation and properties. Water Res 2023; 247:120840. [PMID: 37950954 DOI: 10.1016/j.watres.2023.120840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 10/24/2023] [Accepted: 11/04/2023] [Indexed: 11/13/2023]
Abstract
The presence of manganese(II) in drinking water sources poses a significant treatment difficulty for water utilities, thus necessitating the development of effective removal strategies. Treatment by Fe(VI), a combined oxidant and coagulant, has been identified as a potential green solution; however, its effectiveness is hampered by natural organic matter (NOM), and this underlying mechanism is not fully understood. Here, we investigated the inhibitory effect of three different types of NOM, representing terrestrial, aquatic, and microbial origins, on Mn(II) removal and floc growth during Fe(VI) coagulation. Results revealed that Fe(VI) coagulation effectively removes Mn(II), but NOM could inhibit its effectiveness by competing in oxidation reactions, forming NOM-Fe complexes, and altering floc aggregation. Humic acid was found to exhibit the strongest inhibition due to its unsaturated heterocyclic species that strongly bond to flocs and react with Fe(VI). For the first time, this study has presented a comprehensive elucidation of the atomic-level structure of Fe(VI) hydrolysis products by employing Extended X-ray Absorption Fine Structure Spectroscopy (EXAFS). Results demonstrated that NOM strengthened single-corner and double-corner coordination between FeO6 octahedrons that were consumed by Mn(II), resulting in an increased contribution of γ-FeOOH in the core-shell structure (γ-FeOOH shell and γ-F2O3 core), thereby inhibiting coagulation effects. Furthermore, NOM impeded the formation of stable manganite, resulting in more low-valence Mn(III) being incorporated in the form of an unstable intermediate. These findings provide a deeper understanding of the complex interplay between Fe coagulants, heavy metal pollution, and NOM in water treatment and offer insight into the limitations of Fe(VI) in practical applications.
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Affiliation(s)
- Bingqian Yang
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Resources and Environment, University of Chinese Academy of Sciences (UCAS), Beijing 100049, China
| | - Sajid Rashid
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Resources and Environment, University of Chinese Academy of Sciences (UCAS), Beijing 100049, China
| | - Nigel Graham
- Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
| | - Guibai Li
- State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, China
| | - Wenzheng Yu
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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11
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Jalilehvand F, Homayonia S, Zhang P, Ling CC. Gadolinium(III) complex formation with a β-cyclodextrin ligand: an XAS study of a potential MRI contrast agent. J Biol Inorg Chem 2023; 28:805-811. [PMID: 37981582 DOI: 10.1007/s00775-023-02027-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 10/10/2023] [Indexed: 11/21/2023]
Abstract
In the search for improved and safer gadolinium-based magnetic resonance imaging (MRI) contrast agents, macrocyclic cyclodextrins (CDs) attract great interest. Our group previously synthesized a cyclodextrin-based ligand with 1,2,3-triazolmethyl residues conjugated to β-CD, called β-CD(A), which efficiently chelates Gd(III) ions. To probe the local structure around the Gd(III) ion in the 1:1 Gd(III): β-CD(A) complex in aqueous solution (pH 5.5), we used extended X-ray absorption fine structure (EXAFS) spectroscopy. Least-squares curve fitting of the Gd L3-edge EXAFS spectrum revealed 5 Gd-O (4 COO- and 1 H2O) and 4 Gd-N (from two imino and two 1,2,3-triazole groups) bonds around the Gd(III) ion with average distances 2.36 and 2.56 ± 0.02 Å, respectively. A similar EXAFS spectrum was obtained from an aqueous solution of the clinically used MRI contrast agent Na[Gd(DOTA)(H2O)], also 9-coordinated in its first shell. Careful analysis revealed that the mean Gd-N distance is shorter in the Gd(III): β-CD(A) (1:1) complex, indicating stronger Gd-N bonding and stronger Gd(III) complex formation than with the DOTA4- ligand. This is consistent with the lower free Gd3+ concentration found previously for the Gd(III): β-CD(A) (1:1) complex than for the [Gd(DOTA)(H2O)]- complex, and shows its potential as an MRI probe. EXAFS spectroscopy revealed a similar Gd(III) 9-coordination although slightly stronger for a modified β-cyclodextrin: Gd(III) 1:1 complex, [Gd(LH4)]7-, in aqueous solution than for the clinically used MRI contrast agent Na[Gd(DOTA)(H2O)].
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Affiliation(s)
- Farideh Jalilehvand
- Department of Chemistry, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada.
| | - Saba Homayonia
- Department of Chemistry, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada
| | - Ping Zhang
- Department of Chemistry, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada
| | - Chang-Chun Ling
- Department of Chemistry, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada.
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12
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Potter ME, Mediavilla Madrigal S, Campbell E, Allen LJ, Vyas U, Parry S, García‐Zaragova A, Martínez‐Prieto LM, Oña‐Burgos P, Lützen M, Damsgaard CD, Rodríguez‐Castellón E, Schiaroli N, Fornasari G, Benito P, Beale AM. A High Pressure Operando Spectroscopy Examination of Bimetal Interactions in 'Metal Efficient' Palladium/In 2 O 3 /Al 2 O 3 Catalysts for CO 2 Hydrogenation. Angew Chem Int Ed Engl 2023; 62:e202312645. [PMID: 37723118 PMCID: PMC10952604 DOI: 10.1002/anie.202312645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 09/18/2023] [Accepted: 09/18/2023] [Indexed: 09/20/2023]
Abstract
CO2 hydrogenation to methanol has the potential to serve as a sustainable route to a wide variety of hydrocarbons, fuels and plastics in the quest for net zero. Synergistic Pd/In2 O3 (Palldium on Indium Oxide) catalysts show high CO2 conversion and methanol selectivity, enhancing methanol yield. The identity of the optimal active site for this reaction is unclear, either as a Pd-In alloy, proximate metals, or distinct sites. In this work, we demonstrate that metal-efficient Pd/In2 O3 species dispersed on Al2 O3 can match the performance of pure Pd/In2 O3 systems. Further, we follow the evolution of both Pd and In sites, and surface species, under operando reaction conditions using X-ray Absorption Spectroscpy (XAS) and infrared (IR) spectroscopy. In doing so, we can determine both the nature of the active sites and the influence on the catalytic mechanism.
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Affiliation(s)
- Matthew E. Potter
- Chemistry DepartmentUniversity College London20 Gordon StreetLondonWC1H 0AJUK
- UK Catalysis HubResearch Complex at HarwellRutherford Appleton LaboratoryDidcotOX11 0FAUK
| | - Sofia Mediavilla Madrigal
- UK Catalysis HubResearch Complex at HarwellRutherford Appleton LaboratoryDidcotOX11 0FAUK
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityCardiffCF10 3ATUK
| | - Emma Campbell
- UK Catalysis HubResearch Complex at HarwellRutherford Appleton LaboratoryDidcotOX11 0FAUK
- Cardiff Catalysis InstituteSchool of ChemistryCardiff UniversityCardiffCF10 3ATUK
| | - Lisa J. Allen
- Chemistry DepartmentUniversity College London20 Gordon StreetLondonWC1H 0AJUK
- UK Catalysis HubResearch Complex at HarwellRutherford Appleton LaboratoryDidcotOX11 0FAUK
| | - Urvashi Vyas
- Chemistry DepartmentUniversity College London20 Gordon StreetLondonWC1H 0AJUK
- UK Catalysis HubResearch Complex at HarwellRutherford Appleton LaboratoryDidcotOX11 0FAUK
| | - Stephen Parry
- Diamond Light SourceRutherford Appleton LaboratoryDidcotOX11 0FAUK
| | - Adrián García‐Zaragova
- ITQ, Instituto de Tecnología QuímicaUniversitat Politècnica de València-Consejo Superior de Investigaciones Científicas (UPV-CSIC)Av. de los NaranjosS/N 46022ValenciaSpain
| | - Luis M. Martínez‐Prieto
- ITQ, Instituto de Tecnología QuímicaUniversitat Politècnica de València-Consejo Superior de Investigaciones Científicas (UPV-CSIC)Av. de los NaranjosS/N 46022ValenciaSpain
- IIQ, Instituto de Investigaciones QuímicasCSIC-Universidad de SevillaDepartamento de Química Inorgánica; AvdaAmerico Vespucio 4941092SevilleSpain
| | - Pascual Oña‐Burgos
- ITQ, Instituto de Tecnología QuímicaUniversitat Politècnica de València-Consejo Superior de Investigaciones Científicas (UPV-CSIC)Av. de los NaranjosS/N 46022ValenciaSpain
| | - Mads Lützen
- National Centre for Nanofabrication and CharaterisationTechnical University of DenmarkFysikvej Building 3072800Kgs. LyngbyDenmark
| | - Christian D. Damsgaard
- National Centre for Nanofabrication and CharaterisationTechnical University of DenmarkFysikvej Building 3072800Kgs. LyngbyDenmark
- Department of PhysicsTechnical University of DenmarkFysikvej Building 3112800Kgs. LyngbyDenmark
| | | | - Nicola Schiaroli
- Dipartimento di Chimica Industriale “Toso Montanari”Università di BolognaAlma Mater StudiorumViale Risorgimento 440136BolognaItaly
| | - Giuseppe Fornasari
- Dipartimento di Chimica Industriale “Toso Montanari”Università di BolognaAlma Mater StudiorumViale Risorgimento 440136BolognaItaly
- Center for Chemical Catalysis—C3Università di BolognaAlma Mater StudiorumViale Risorgimento 440136BolognaItaly
| | - Patricia Benito
- Dipartimento di Chimica Industriale “Toso Montanari”Università di BolognaAlma Mater StudiorumViale Risorgimento 440136BolognaItaly
- Center for Chemical Catalysis—C3Università di BolognaAlma Mater StudiorumViale Risorgimento 440136BolognaItaly
| | - Andrew M. Beale
- Chemistry DepartmentUniversity College London20 Gordon StreetLondonWC1H 0AJUK
- UK Catalysis HubResearch Complex at HarwellRutherford Appleton LaboratoryDidcotOX11 0FAUK
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13
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Daka M, Montini T, Pengo P, Marussi G, Crosera M, Adami G, Delgado JJ, Giambastiani G, Fertey P, Fonda E, Pasquato L, Fornasiero P. Reduced Tiara-like Palladium Complex for Suzuki Cross-Coupling Reactions. Chemistry 2023; 29:e202301740. [PMID: 37522641 DOI: 10.1002/chem.202301740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 07/25/2023] [Accepted: 07/31/2023] [Indexed: 08/01/2023]
Abstract
The design of highly active and structurally well-defined catalysts has become a crucial issue for heterogeneous catalysed reactions while reducing the amount of catalyst employed. Beside conventional synthetic routes, the employment of polynuclear transition metal complexes as catalysts or catalyst precursors has progressively intercepted a growing interest. These well-defined species promise to deliver catalytic systems where a strict control on the nuclearity allows to improve the catalytic performance while reducing the active phase loading. This study describes the development of a highly active and reusable palladium-based catalyst on alumina (Pd8 /Al2 O3 ) for Suzuki cross-coupling reactions. An octanuclear tiara-like palladium complex was selected as active phase precursor to give isolated Pd-clusters of ca. 1 nm in size on Al2 O3 . The catalyst was thoroughly characterised by several complementary techniques to assess its structural and chemical nature. The high specific activity of the catalyst has allowed to carry out the cross-coupling reaction in 30 min using only 0.12 mol % of Pd loading under very mild and green reaction conditions. Screening of various substrates and selectivity tests, combined with recycling and benchmarking experiments, have been used to highlight the great potentialities of this new Pd8 /Al2 O3 catalyst.
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Affiliation(s)
- Mario Daka
- Department of Chemical and Pharmaceutical Sciences, INSTM, UdR Trieste, University of Trieste, Trieste, 34127, Italy
| | - Tiziano Montini
- Department of Chemical and Pharmaceutical Sciences, INSTM, UdR Trieste, University of Trieste, Trieste, 34127, Italy
- Center for Energy, Environment and, Transport Giacomo Ciamician and ICCOM-CNR Trieste Research Unit, University of Trieste, Trieste, 34127, Italy
| | - Paolo Pengo
- Department of Chemical and Pharmaceutical Sciences, INSTM, UdR Trieste, University of Trieste, Trieste, 34127, Italy
| | - Giovanna Marussi
- Department of Chemical and Pharmaceutical Sciences, INSTM, UdR Trieste, University of Trieste, Trieste, 34127, Italy
| | - Matteo Crosera
- Department of Chemical and Pharmaceutical Sciences, INSTM, UdR Trieste, University of Trieste, Trieste, 34127, Italy
| | - Gianpiero Adami
- Department of Chemical and Pharmaceutical Sciences, INSTM, UdR Trieste, University of Trieste, Trieste, 34127, Italy
| | - Juan Jose Delgado
- Departamento de Ciencia de los Materiales, Ingeniería Metalúrgica y Química Inorgánica, Universidad de Cádiz, Campus Río San Pedro, Puerto Real, Cádiz, 11510, Spain
- Instituto Universitario de Investigación en, Microscopía Electrónica y Materiales (IMEYMAT), Universidad de Cádiz, Campus Río San Pedro, Puerto Real, Cádiz, 11510, Spain
| | - Giuliano Giambastiani
- Institute of Chemistry of OrganoMetallic Compounds, ICCOM-CNR and Consorzio INSTM, 50019, Sesto F.no, Florence, Italy
| | - Pierre Fertey
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP48, 91192, Gif sur Yvette Cedex, France
| | - Emiliano Fonda
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP48, 91192, Gif sur Yvette Cedex, France
| | - Lucia Pasquato
- Department of Chemical and Pharmaceutical Sciences, INSTM, UdR Trieste, University of Trieste, Trieste, 34127, Italy
| | - Paolo Fornasiero
- Department of Chemical and Pharmaceutical Sciences, INSTM, UdR Trieste, University of Trieste, Trieste, 34127, Italy
- Center for Energy, Environment and, Transport Giacomo Ciamician and ICCOM-CNR Trieste Research Unit, University of Trieste, Trieste, 34127, Italy
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14
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Ostervold L, Smerigan A, Liu MJ, Filardi LR, Vila FD, Perez-Aguilar JE, Hong J, Tarpeh WA, Hoffman AS, Greenlee LF, Clark EL, Janik MJ, Bare SR. Cation Incorporation into Copper Oxide Lattice at Highly Oxidizing Potentials. ACS Appl Mater Interfaces 2023; 15:47025-47036. [PMID: 37756387 DOI: 10.1021/acsami.3c10296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/29/2023]
Abstract
Electrolyte cations can have significant effects on the kinetics and selectivity of electrocatalytic reactions. We show an atypical mechanism through which electrolyte cations can impact electrocatalyst performance─direct incorporation of the cation into the oxide electrocatalyst lattice. We investigate the transformations of copper electrodes in alkaline electrochemistry through operando X-ray absorption spectroscopy in KOH and Ba(OH)2 electrolytes. In KOH electrolytes, both the near-edge structure and extended fine-structure agree with previous studies; however, the X-ray absorption spectra vary greatly in Ba(OH)2 electrolytes. Through a combination of electronic structure modeling, near-edge simulation, and postreaction characterization, we propose that Ba2+ cations are directly incorporated into the lattice and form an ordered BaCuO2 phase at potentials more oxidizing than 200 mV vs the normal hydrogen electrode (NHE). BaCuO2 formation is followed by further oxidation to a bulk Cu3+-like BaxCuyOz phase at 900 mV vs NHE. Additionally, during reduction in Ba(OH)2 electrolyte, we find both Cu-O bonds and Cu-Ba scattering persist at potentials as low as -400 mV vs NHE. To our knowledge, this is the first evidence for direct oxidative incorporation of an electrolyte cation into the bulk lattice to form a mixed oxide electrode. The oxidative incorporation of electrolyte cations to form mixed oxides could open a new route for the in situ formation of active and selective oxidation electrocatalysts.
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Affiliation(s)
- Lars Ostervold
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Adam Smerigan
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Matthew J Liu
- Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Leah R Filardi
- Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
| | - Fernando D Vila
- Department of Physics, University of Washington, Seattle, Washington 98195, United States
| | - Jorge E Perez-Aguilar
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Jiyun Hong
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - William A Tarpeh
- Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Adam S Hoffman
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Lauren F Greenlee
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Ezra Lee Clark
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Michael J Janik
- Department of Chemical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Simon R Bare
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
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15
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Zhuang S, Wang J. Efficient adsorptive removal of Co 2+ from aqueous solution using graphene oxide. Environ Sci Pollut Res Int 2023; 30:101433-101444. [PMID: 37651017 DOI: 10.1007/s11356-023-29374-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Accepted: 08/13/2023] [Indexed: 09/01/2023]
Abstract
This study aimed to utilize synthesized graphene oxide (GO) for adsorptive removal of cobalt ions and investigate the adsorption mechanism using advanced techniques such as X-ray absorption spectra (XAFS). The GO was synthesized via an improved Hummers method, resulting in high surface area (93.7 m2/g) and abundant oxygen-containing functional groups. Various characterizations, including SEM, TEM, Raman, FT-IR, TG, potentiometric titrations, and N2 sorption-desorption measurements, were employed to characterize the GO. The adsorption behavior of GO towards Co2+ was investigated, and the results showed that the adsorption process followed a pseudo-second-order kinetic model and the Langmuir model, with a maximum sorption capacity of 93.7 mg/g. The adsorption process was chemisorption and endothermic, with GO showing adsorption selectivity order of Co2+ > Sr2+ > Cs+. Based on various characterizations such as X-ray absorption near-edge spectroscopy (XANES), extended X-ray absorption fine structure (EXAFS), FT-IR, and XPS, the sorption mechanism of Co2+ onto GO was discussed, with the results indicating that coordination and electrostatic interaction were the primary adsorption mechanisms, with oxygen-containing functional groups playing a vital role. The first coordinating atom for Co2+ was O, and the coordination environment was similar to that of cobalt acetate and CoO. Overall, this study provides comprehensive understanding of the adsorption behavior and mechanism of Co2+ onto GO, highlighting its potential as an effective adsorbent for removing nuclides from aqueous solution.
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Affiliation(s)
- Shuting Zhuang
- School of Environment & Natural Resources, Renmin University of China, Beijing, 100872, People's Republic of China
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, People's Republic of China
| | - Jianlong Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, People's Republic of China.
- Beijing Key Laboratory of Radioactive Waste Treatment, INET, Tsinghua University, Beijing, 100084, People's Republic of China.
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16
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Yang B, Graham N, Liu P, Liu M, Gregory J, Yu W. Atomic-Level Structural Differences between Fe(III) Coprecipitates Generated by the Addition of Fe(III) Coagulants and by the Oxidation of Fe(II) Coagulants Determine Their Coagulation Behavior in Phosphate and DOM Removal. Environ Sci Technol 2023; 57:12489-12500. [PMID: 37551789 DOI: 10.1021/acs.est.3c03463] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
In situ Fe(III) coprecipitation from Fe2+ oxidation is a widespread phenomenon in natural environments and water treatment processes. Studies have shown the superiority of in situ Fe(III) (formed by in situ oxidation of a Fe(II) coagulant) over ex situ Fe(III) (using a Fe(III) coagulant directly) in coagulation, but the reasons remain unclear due to the uncertain nature of amorphous structures. Here, we utilized an in situ Fe(III) coagulation process, oxidizing the Fe(II) coagulant by potassium permanganate (KMnO4), to treat phosphate-containing surface water and analyzed differences between in situ and ex situ Fe(III) coagulation in phosphate removal, dissolved organic matter (DOM) removal, and floc growth. Compared to ex situ Fe(III), flocs formed by the natural oxidizing Fe2+ coagulant exhibited more effective phosphate removal. Furthermore, in situ Fe(III) formed through accelerated oxidation by KMnO4 demonstrated improved flocculation behavior and enhanced removal of specific types of DOM by forming a more stable structure while still maintaining effective phosphate removal. Fe K-edge extended X-ray absorption fine structure spectra (EXAFS) of the flocs explained their differences. A short-range ordered strengite-like structure (corner-linked PO4 tetrahedra to FeO6 octahedra) was the key to more effective phosphorus removal of in situ Fe(III) than ex situ Fe(III) and was well preserved when KMnO4 accelerated in situ Fe(III) formation. Conversely, KMnO4 significantly inhibited the edge and corner coordination between FeO6 octahedra and altered the floc-chain-forming behavior by accelerating hydrolysis, resulting in a more dispersed monomeric structure than ex situ Fe(III). This research provides an explanation for the superiority of in situ Fe(III) in phosphorus removal and highlights the importance of atomic-level structural differences between ex situ and in situ Fe(III) coprecipitates in water treatment.
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Affiliation(s)
- Bingqian Yang
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Nigel Graham
- Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K
| | - Peng Liu
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
| | - Mengjie Liu
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - John Gregory
- Department of Civil, Environmental and Geomatic Engineering, University College London, Gower Street, London WC1E 6BT, U.K
| | - Wenzheng Yu
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China
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17
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Lappi TI, Gayfulin YM, Renaud A, Prestipino C, Lemoine P, Yanshole VV, Muravieva VK, Cordier S, Naumov NG. From K 6[Re 6-xMo xS 8(CN) 5] Solid Solution to Individual Cluster Complexes: Separation and Investigation of [Re 4Mo 2S 8(CN) 6] n- and [Re 3Mo 3S 8(CN) 6] n- Heterometallic Clusters. Molecules 2023; 28:5875. [PMID: 37570845 PMCID: PMC10421489 DOI: 10.3390/molecules28155875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 08/01/2023] [Accepted: 08/02/2023] [Indexed: 08/13/2023] Open
Abstract
A series of new cluster compounds with {Re4Mo2S8} and {Re3Mo3S8} cores has been obtained and investigated. The clusters with different Re/Mo ratios were isolated as individual compounds, which made it possible to study their spectroscopic and electrochemical properties. The geometry of the new clusters was studied using a combination of X-ray diffraction analysis, XAS and quantum chemical DFT calculations. It was shown that the properties of the new clusters, such as the number and position of electrochemical transitions, electronic structure and change in geometry with a change in charge, are similar to the properties of clusters based on the {Re4Mo2Se8} and {Re3Mo3Se8} cores described earlier.
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Affiliation(s)
- Tatiana I. Lappi
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3, Acad. Lavrentiev Ave., 630090 Novosibirsk, Russia; (T.I.L.); (Y.M.G.); (V.K.M.)
| | - Yakov M. Gayfulin
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3, Acad. Lavrentiev Ave., 630090 Novosibirsk, Russia; (T.I.L.); (Y.M.G.); (V.K.M.)
| | - Adèle Renaud
- UFR Sciences et Propriétés de la Matière, Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes (ISCR) UMR 6226, F-35000 Rennes, France; (A.R.); (C.P.); (S.C.)
| | - Carmelo Prestipino
- UFR Sciences et Propriétés de la Matière, Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes (ISCR) UMR 6226, F-35000 Rennes, France; (A.R.); (C.P.); (S.C.)
| | - Pierric Lemoine
- Institut Jean Lamour, UMR 7198 CNRS, Universite de Lorraine, F-54011 Nancy, France;
| | - Vadim V. Yanshole
- International Tomography Center SB RAS, 3A, Institutskaya Str., 630090 Novosibirsk, Russia;
| | - Viktoria K. Muravieva
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3, Acad. Lavrentiev Ave., 630090 Novosibirsk, Russia; (T.I.L.); (Y.M.G.); (V.K.M.)
| | - Stéphane Cordier
- UFR Sciences et Propriétés de la Matière, Université de Rennes, CNRS, Institut des Sciences Chimiques de Rennes (ISCR) UMR 6226, F-35000 Rennes, France; (A.R.); (C.P.); (S.C.)
| | - Nikolai G. Naumov
- Nikolaev Institute of Inorganic Chemistry SB RAS, 3, Acad. Lavrentiev Ave., 630090 Novosibirsk, Russia; (T.I.L.); (Y.M.G.); (V.K.M.)
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18
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Kalintsev A, Guan Q, Brugger J, Migdisov A, Etschmann B, Ram R, Liu W, Mei Y, Testemale D, Xu H. Nature and coordination geometry of geologically relevant aqueous Uranium(VI) complexes up to 400 ºC: A review and new data. J Hazard Mater 2023; 452:131309. [PMID: 37018892 DOI: 10.1016/j.jhazmat.2023.131309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 03/23/2023] [Accepted: 03/26/2023] [Indexed: 06/19/2023]
Abstract
The structure of the uranyl aqua ion (UO22+) and a number of its inorganic complexes (specifically, UO2Cl+, UO2Cl20, UO2SO40, [Formula: see text] , [Formula: see text] and UO2OH42-) have been characterised using X-Ray absorption spectroscopy/extended X-Ray absorption fine structure (XAS/EXAFS) at temperatures ranging from 25 to 326 ºC. Results of ab initio molecular dynamics (MD) calculations are also reported for uranyl in chloride and sulfate-bearing fluids from 25 to 400 ºC and 600 bar to 20 kilobar (kb). These results are reported alongside a comprehensive review of prior structural characterisation work with particular focus given to EXAFS works to provide a consistent and up-to-date view of the structure of these complexes under conditions relevant to U mobility in ore-forming systems and around high-grade nuclear waste repositories. Regarding reported EXAFS results, average equatorial coordination was found to decrease in uranyl and its sulfate and chloride complexes as temperature rose - the extent of this decrease differed between species and solution compositions but typically resulted in an equatorial coordination number of ∼3-4 at temperatures above 200 ºC. The [Formula: see text] complex was observed at temperatures from 25 to 247 ºC and exhibited no major structural changes over this temperature range. UO2OH42- exhibited only minor structural changes over a temperature range from 88 to 326 ºC and was suggested to manifest fivefold coordination with four hydroxyl molecules and one water molecule around its equator. Average coordination values derived from fits of the reported EXAFS data were compared to average coordination values calculated using the experimentally derived thermodynamic data for chloride complexes reported by Dargent et al. (2013) and Migdisov et al. (2018b), and for sulfate complexes reported by Alcorn et al. (2019) and Kalintsev et al. (2019). Sulfate EXAFS data were well described by available thermodynamic data, and chloride EXAFS data were described well by the thermodynamic data of Migdisov et al. (2018b), but not by the data of Dargent et al. (2013). The ab initio molecular dynamics calculations confirmed the trends in equatorial coordination observed with EXAFS and were also able to provide an insight into the effect of pressure in equatorial water coordination - for a given temperature, higher pressures appear to lead to a greater number of equatorially bound waters counteracting the temperature effect.
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Affiliation(s)
- Alexander Kalintsev
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia; Los Alamos National Laboratory, Earth & Environmental Division, Los Alamos, NM, USA.
| | - Qiushi Guan
- CSIRO Mineral Resources, Kensington, WA 6151, Australia
| | - Joël Brugger
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia
| | - Artas Migdisov
- Los Alamos National Laboratory, Earth & Environmental Division, Los Alamos, NM, USA
| | - Barbara Etschmann
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia
| | - Rahul Ram
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia
| | - Weihua Liu
- CSIRO Mineral Resources, Kensington, WA 6151, Australia
| | - Yuan Mei
- CSIRO Mineral Resources, Kensington, WA 6151, Australia
| | - Denis Testemale
- CNRS, Université Grenoble Alpes, Institut NEEL, Grenoble F-38000, France
| | - Hongwu Xu
- Los Alamos National Laboratory, Earth & Environmental Division, Los Alamos, NM, USA
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19
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Zhou W, Zhou J, Feng X, Wen B, Zhou A, Liu P, Sun G, Zhou Z, Liu X. Antimony Isotope Fractionation Revealed from EXAFS during Adsorption on Fe (Oxyhydr)oxides. Environ Sci Technol 2023. [PMID: 37295412 DOI: 10.1021/acs.est.3c01906] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A lack of knowledge about antimony (Sb) isotope fractionation mechanisms in key geochemical processes has limited its environmental applications as a tracer. Naturally widespread iron (Fe) (oxyhydr)oxides play a key role in Sb migration due to strong adsorption, but the behavior and mechanisms of Sb isotopic fractionation on Fe (oxyhydr)oxides are still unclear. Here, we investigate the adsorption mechanisms of Sb on ferrihydrite (Fh), goethite (Goe), and hematite (Hem) using extended X-ray absorption fine structure (EXAFS) and show that inner-sphere complexation of Sb species with Fe (oxyhydr)oxides occurs independent of pH and surface coverage. Lighter Sb isotopes are preferentially enriched on Fe (oxyhydr)oxides due to isotopic equilibrium fractionation, with neither surface coverage nor pH influencing the degree of fractionation (Δ123Sbaqueous-adsorbed). Limited Fe atoms are present in the second shell of Hem and Goe, resulting in weaker surface complexes and leading to greater Sb isotopic fractionation than with Fh (Δ123Sbaqueous-adsorbed of 0.49 ± 0.004, 1.12 ± 0.006, and 1.14 ± 0.05‰ for Fh, Hem, and Goe, respectively). These results improve the understanding of the mechanism of Sb adsorption by Fe (oxyhydr)oxides and further clarify the Sb isotope fractionation mechanism, providing an essential basis for future application of Sb isotopes in source and process tracing.
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Affiliation(s)
- Weiqing Zhou
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
- Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan 430074, China
- Key Laboratory of Mine Ecological Effects and System Restoration, Ministry of Natural Resources, Beijing 100081, China
| | - Jianwei Zhou
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
- Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan 430074, China
- Key Laboratory of Mine Ecological Effects and System Restoration, Ministry of Natural Resources, Beijing 100081, China
| | - Xinbin Feng
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Bing Wen
- State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Nanjing 210042, China
| | - Aiguo Zhou
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
| | - Peng Liu
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
- Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan 430074, China
- Key Laboratory of Mine Ecological Effects and System Restoration, Ministry of Natural Resources, Beijing 100081, China
| | - Guangyi Sun
- State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
| | - Ziyi Zhou
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
| | - Xin Liu
- Central-Southern Safety & Environment Technology Institute Co., Ltd., Wuhan 430000, China
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20
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Peña Corredor A, Viart N, Lefevre C. inserexs: reflection choice software for resonant elastic X-ray scattering. J Appl Crystallogr 2023; 56:854-859. [PMID: 37284260 PMCID: PMC10241054 DOI: 10.1107/s1600576723002212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 03/07/2023] [Indexed: 06/08/2023] Open
Abstract
This paper presents inserexs, an open-source computer program that aims to pre-evaluate the different reflections for resonant elastic X-ray scattering (REXS) diffraction experiments. REXS is an extremely versatile technique that can provide positional and occupational information about the atoms present in a crystal. inserexs was conceived to help REXS experimentalists know beforehand which reflections to choose to determine a parameter of interest. Prior work has already proven this to be useful in the determination of atomic positions in oxide thin films. inserexs allows generalization to any given system and aims to popularize resonant diffraction as an alternative technique to improve the resolution of crystalline structures.
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Affiliation(s)
- Antonio Peña Corredor
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, 23 rue du Loess, Strasbourg 67200, France
| | - Nathalie Viart
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, 23 rue du Loess, Strasbourg 67200, France
| | - Christophe Lefevre
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, 23 rue du Loess, Strasbourg 67200, France
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21
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Betts AR, Siebecker MG, Elzinga EJ, Luxton TP, Scheckel KG, Sparks DL. Influence of clay mineral weathering on green rust formation at iron-reducing conditions. Geochim Cosmochim Acta 2023; 350:46-56. [PMID: 37469621 PMCID: PMC10355121 DOI: 10.1016/j.gca.2023.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/21/2023]
Abstract
Green rusts (GR) are important drivers for trace metal and nutrient cycling in suboxic environments. We investigated whether green rusts would incorporate aluminum (Al) or other elements from naturally-formed clay minerals containing easily-weatherable clay minerals (e.g. mica, interlayered clays). We isolated the clay minerals from a Matapeake silt loam soil by removal of silt and sand, organic matter, and reducible oxides to study mechanisms of interaction between Fe(II) and soil-sourced clay minerals. We conducted batch Fe(II) sorption experiments at multiple near-neutral pHs (6.5-7.5) and reaction times (2 h-365 days). Mineral transformations were characterized by selective extractions, X-ray diffraction (XRD), and Fe X-ray absorption spectroscopy (XAS) analyzed by shell-fitting and linear combination fitting (LCF) with natural and synthetic standards. Clay mineral fraction contained a mixture of quartz, kaolinite, interlayered vermiculite, mica, and chlorite with significant structural Fe (2.6% wt). Uptake of Fe(II) increased with pH and kinetics were rapid until 5 days, followed by slow continuous Fe(II) uptake. Citrate-bicarbonate desorption kinetics from Fe(II) sorbed clay released more Al and silicon (Si) compared with unreacted soil clay fraction whereas magnesium (Mg) and potassium (K) were unaffected. Citrate-bicarbonate extracted Fe contained more Fe(II) than an ideal GR with an Fe(II)/Fe(III) molar ratio of 5.50. Analysis of the Fe EXAFS by both LCF and shell fitting was best modeled as a combination of Fe(III)-clay reduction to Fe(II) and precipitation of GR and Fe(II)-Al LDH. After 7 days of Fe(II) sorption, LCF identified 55.2% total Fe in clay, 33.4% GR(Cl) and 11.4% Fe(II)-Al LDH. These results provide novel evidence of Fe(II)-Al LDHs precipitating on naturally-formed soil clay minerals as a minor phase to GR. The geochemical implications are that GRs formed in soils and sediments should be considered to have Al and Si as well as Mg substitutions affecting their structure and reactivity.
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Affiliation(s)
- Aaron R. Betts
- Department of Plant and Soil Science, University of Delaware, 221 Academy St, Newark, DE 19716, USA
| | - Matthew G. Siebecker
- Department of Plant and Soil Science, University of Delaware, 221 Academy St, Newark, DE 19716, USA
| | - Evert J. Elzinga
- Department of Earth and Environmental Sciences, Rutgers University, 101 Warren St, Newark, NJ 07102, USA
| | - Todd P. Luxton
- Office of Research & Development, U.S. Environmental Protection Agency, 5995 Center Hill Ave, Cincinnati, OH 45224, USA
| | - Kirk G. Scheckel
- Office of Research & Development, U.S. Environmental Protection Agency, 5995 Center Hill Ave, Cincinnati, OH 45224, USA
| | - Donald L. Sparks
- Department of Plant and Soil Science, University of Delaware, 221 Academy St, Newark, DE 19716, USA
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22
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Zhao YG, Wang EJ, Zheng JJ, Guan F, Lu Y. Modeling and spectroscopic investigation of U(VI) removal on porous amidoxime-functionalized metal organic framework derived from macromolecular carbohydrate. Int J Biol Macromol 2023:125043. [PMID: 37224909 DOI: 10.1016/j.ijbiomac.2023.125043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 05/18/2023] [Accepted: 05/21/2023] [Indexed: 05/26/2023]
Abstract
The investigation of interaction mechanism of U(VI) selective removal on amidoxime-functionalized metal organic framework (i.e., UiO-66(Zr)-AO) derived from macromolecular carbohydrate is conducive to apply metal organic frameworks in actual environmental remediation. The batch experiments showed that UiO-66(Zr)-AO displayed the fast removal rate (equilibrium time of 0.5 h), high adsorption capacity (384.6 mg/g), excellent regeneration performance (<10 % decrease after three cycles) towards U(VI) removal due to the unprecedented chemical stability, large surface area and simple fabrication. U(VI) removal at different pH can be satisfactorily fitted by diffuse layer modeling with cation exchange at low pH and an inner-sphere surface complexation at high pH. The inner-sphere surface complexation was further demonstrated by X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) analysis. These findings revealed that UiO-66(Zr)-AO can be an effective adsorbent to remove the radionuclides from aqueous solution, which is crucial for recycling of uranium resource and decreasing the uranium harm to the environment.
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Affiliation(s)
- Yong-Gang Zhao
- Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province, College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
| | - En-Jun Wang
- Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province, College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
| | - Jun-Jie Zheng
- Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province, College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
| | - Fachun Guan
- Institute of Rural Energy and Ecology, Jilin Academy of Agricultural Sciences, Changchun 130033, China
| | - Yin Lu
- Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province, College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China.
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23
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Kenney JPL, Lezama-Pacheco J, Fendorf S, Alessi DS, Weiss DJ. Uranium surface processes with sandstone and volcanic rocks in acidic and alkaline solutions. J Colloid Interface Sci 2023; 645:715-723. [PMID: 37172481 DOI: 10.1016/j.jcis.2023.04.174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 04/26/2023] [Accepted: 04/30/2023] [Indexed: 05/15/2023]
Abstract
Understanding the behaviour of uranium waste, for disposal purposes, is crucial due to the correlation between pH values and the disposal of distinct types of waste, with low level waste typically associated with acidic pH values, and higher and intermediate level waste commonly related to alkaline pH values. We studied the adsorption of U(VI) on sandstone and volcanic rock surfaces at pH 5.5 and 11.5 in aqueous solutions with and without bicarbonate (2 mM HCO3-) using XAS and FTIR. In the sandstone system, U(VI) adsorbs as a bidentate complex to Si at pH 5.5 without bicarbonate and as uranyl carbonate species with bicarbonate. At pH 11.5 without bicarbonate, U(VI) adsorbs as monodentate complexes to Si and precipitates as uranophane. With bicarbonate at pH 11.5, U(VI) precipitated as a Na-clarkeite mineral or remained as a uranyl carbonate surface species. In the volcanic rock system, U(VI) adsorbed to Si as an outer sphere complex at pH 5.5, regardless of the presence of bicarbonate. At pH 11.5 without bicarbonate, U(VI) adsorbed as a monodentate complex to one Si atom and precipitated as a Na-clarkeite mineral. With bicarbonate at pH 11.5, U(VI) sorbed as a bidentate carbonate complex to one Si atom. These results provide insight into the behaviour of U(VI) in heterogeneous, real-world systems related to the disposal of radioactive waste.
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Affiliation(s)
- Janice P L Kenney
- Earth Science and Engineering, Imperial College London, London, United Kingdom; Department of Physical Sciences, MacEwan University, Edmonton, Alberta, Canada.
| | - Juan Lezama-Pacheco
- Earth Systems Science Department, Stanford University, Stanford, United States of America
| | - Scott Fendorf
- Earth Systems Science Department, Stanford University, Stanford, United States of America
| | - Daniel S Alessi
- Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada
| | - Dominik J Weiss
- Earth Science and Engineering, Imperial College London, London, United Kingdom; Earth Systems Science Department, Stanford University, Stanford, United States of America.
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24
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Stellhorn JR, Paulus B, Klee BD, Inui M, Taniguchi H, Sutou Y, Hosokawa S, Pilgrim WC. Structural origins of the unusual thermal stability of amorphous Cu xGe 50-xTe 50(0⩽ x⩽33.3). J Phys Condens Matter 2023; 35:304004. [PMID: 37072003 DOI: 10.1088/1361-648x/acce13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Accepted: 04/18/2023] [Indexed: 06/19/2023]
Abstract
We have investigated the local atomic structures of several compositions of the amorphous phase of the system CuxGe50-xTe50(0⩽x⩽33.3), based on extended x-ray absorption fine-structure as well as anomalous x-ray scattering experiments, and discuss the unusual trend regarding their thermal stability as a function of the Cu content. At low concentrations (x⩽15), Cu atoms tend to agglomerate in flat nanoclusters reminiscent of the crystalline phase of metallic Cu, leading to a more and more Ge-deficient Ge-Te host network structure with growing Cu content and an increasing thermal stability. At higher Cu concentrations (x⩾25), Cu is incorporated into the network, leading to an overall weaker bonding situation which is associated with a decreasing thermal stability.
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Affiliation(s)
- J R Stellhorn
- Department of Physics, Nagoya University, Nagoya 464-0862, Japan
- Department of Applied Chemistry, Hiroshima University, Hiroshima 739-8527, Japan
- Department of Chemistry, Philipps University Marburg, Marburg 35032, Germany
| | - B Paulus
- Department of Chemistry, Philipps University Marburg, Marburg 35032, Germany
| | - B D Klee
- Department of Chemistry, Philipps University Marburg, Marburg 35032, Germany
- Wigner Research Centre for Physics, Budapest 1121, Hungary
| | - M Inui
- Graduate School of Advanced Science and Engineering, Hiroshima University, Hiroshima, 739-8521, Japan
| | - H Taniguchi
- Department of Physics, Nagoya University, Nagoya 464-0862, Japan
| | - Y Sutou
- Department of Materials Science, Tohoku University, Sendai 980-8579, Japan
- WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - S Hosokawa
- Department of Chemistry, Philipps University Marburg, Marburg 35032, Germany
- Institute of Industrial Nanomaterials, Kumamoto University, Kumamoto 860-8555, Japan
| | - W-C Pilgrim
- Department of Chemistry, Philipps University Marburg, Marburg 35032, Germany
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25
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Engel M, Noël V, Pierce S, Kovarik L, Kukkadapu RK, Pacheco JSL, Qafoku O, Runyon JR, Chorover J, Zhou W, Cliff J, Boye K, Bargar JR. Structure and composition of natural ferrihydrite nano-colloids in anoxic groundwater. Water Res 2023; 238:119990. [PMID: 37146398 DOI: 10.1016/j.watres.2023.119990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 04/19/2023] [Accepted: 04/20/2023] [Indexed: 05/07/2023]
Abstract
Fe-rich mobile colloids play vital yet poorly understood roles in the biogeochemical cycling of Fe in groundwater by influencing organic matter (OM) preservation and fluxes of Fe, OM, and other essential (micro-)nutrients. Yet, few studies have provided molecular detail on the structures and compositions of Fe-rich mobile colloids and factors controlling their persistence in natural groundwater. Here, we provide comprehensive new information on the sizes, molecular structures, and compositions of Fe-rich mobile colloids that accounted for up to 72% of aqueous Fe in anoxic groundwater from a redox-active floodplain. The mobile colloids are multi-phase assemblages consisting of Si-coated ferrihydrite nanoparticles and Fe(II)-OM complexes. Ferrihydrite nanoparticles persisted under both oxic and anoxic conditions, which we attribute to passivation by Si and OM. These findings suggest that mobile Fe-rich colloids generated in floodplains can persist during transport through redox-variable soils and could be discharged to surface waters. These results shed new light on their potential to transport Fe, OM, and nutrients across terrestrial-aquatic interfaces.
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Affiliation(s)
- Maya Engel
- Environmental Geochemistry Group, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Vincent Noël
- Environmental Geochemistry Group, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Samuel Pierce
- Environmental Geochemistry Group, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Libor Kovarik
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Ravi K Kukkadapu
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | | | - Odeta Qafoku
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - J Ray Runyon
- Department of Environmental Science, University of Arizona, Tucson, AZ 85721, USA
| | - Jon Chorover
- Department of Environmental Science, University of Arizona, Tucson, AZ 85721, USA
| | - Weijiang Zhou
- Division of CryoEM and Bioimaging, SSRL, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - John Cliff
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Kristin Boye
- Environmental Geochemistry Group, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - John R Bargar
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354, USA.
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26
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Arias RJ, Welch EF, Blackburn NJ. New structures reveal flexible dynamics between the subdomains of peptidylglycine monooxygenase. Implications for an open to closed mechanism. Protein Sci 2023; 32:e4615. [PMID: 36880254 PMCID: PMC10031757 DOI: 10.1002/pro.4615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 02/28/2023] [Accepted: 03/02/2023] [Indexed: 03/08/2023]
Abstract
Peptidylglycine monooxygenase (PHM) is essential for the biosynthesis of many neuroendocrine peptides via a copper-dependent hydroxylation of a glycine-extended pro-peptide. The "canonical" mechanism requires the transfer of two electrons from one mononuclear copper (CuH, H-site) to a second mononuclear copper (CuM, M-site) which is the site of oxygen binding and catalysis. In most crystal structures the copper centers are separated by 11 Å of disordered solvent, but recent work has established that a PHM variant H108A forms a closed conformer in the presence of citrate with a reduced Cu-Cu site separation of ~4 Å. Here we report three new PHM structures where the H and M sites are separated by a longer distance of ~14 Å. Variation in Cu-Cu distance is the result of a rotation of the M subdomain about a hinge point centered on the pro199 -leu200 -ile201 triad which forms the linker between subdomains. The energetic cost of domain dynamics is likely small enough to allow free rotation of the subdomains relative to each other, adding credence to recent suggestions that an open-to-closed transition to form a binuclear oxygen binding intermediate is an essential element of catalysis. This inference would explain many experimental observations that are inconsistent with the current canonical mechanism including substrate-induced oxygen activation and isotope scrambling during the peroxide shunt.
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Affiliation(s)
- Renee J. Arias
- Department of Chemical Physiology and BiochemistryOregon Health and Science UniversityPortlandOregonUSA
- Present address:
Materials and Structural Analysis Division, Thermo Fisher ScientificHillsboroOregonUSA
| | - Evan F. Welch
- Department of Chemical Physiology and BiochemistryOregon Health and Science UniversityPortlandOregonUSA
- Department of Biomedical EngineeringOregon Health and Science UniversityPortlandOregonUSA
| | - Ninian J. Blackburn
- Department of Chemical Physiology and BiochemistryOregon Health and Science UniversityPortlandOregonUSA
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27
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Abstract
Soil zinc contamination is a major threat to water quality and sensitive ecosystems. While Zn itself is not redox-active in soils, transitions in soil redox conditions may promote mobilization of Zn from common Zn hosts, including Mn(IV)/Fe(III)-(hydr)oxides and sulfide precipitates, leading to elevated concentrations of dissolved Zn in surface and groundwater and thus a potential increase in Zn transport and uptake. Here, we examined the impacts of hydrologic fluctuations and coupled redox transitions on Zn partitioning in contaminated riparian soil in a mountain watershed. We found that oxygenation of the soil profile during low water conditions caused a spike in porewater Zn concentrations, driven by oxidative dissolution of amorphous ZnS and weak partitioning of Zn to Fe(III)-(hydr)oxides, hydroxy-interlayer vermiculite, and vermiculite. In contrast to Pb, released Zn did not immediately adsorb to Fe(III)-(hydr)oxides or particulate organic matter due to less-favorable sorption of Zn than that of Pb and, further, decreased Zn sorption at slightly acidic pH. As aridification intensifies and groundwater levels decline throughout the western United States, contaminated floodplain soils in mountain watersheds may be frequently oxygenated, leading to increased mobilization of dissolved Zn, which will amplify the threat Zn poses to water quality and ecosystem health.
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Affiliation(s)
- Christian Dewey
- Earth System Science Department, Stanford University, Stanford, California 94305, United States
| | - Farid Juillot
- Centre IRD Nouméa, Nouméa 98848, New Caledonia
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Université, Paris 75005, France
| | - Scott Fendorf
- Earth System Science Department, Stanford University, Stanford, California 94305, United States
| | - John R Bargar
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
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28
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Karimian N, Johnston SG, Tavakkoli E, Frierdich AJ, Burton ED. Mechanisms of Arsenic and Antimony Co-sorption onto Jarosite: An X-ray Absorption Spectroscopic Study. Environ Sci Technol 2023; 57:4813-4820. [PMID: 36929871 DOI: 10.1021/acs.est.2c08213] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Jarosite, a common mineral in acidic sulfur-rich environments, can strongly sorb both As(V) and Sb(V). However, little is known regarding the mechanisms that control simultaneous co-sorption of As(V) and Sb(V) to jarosite. We investigated the mechanisms controlling As(V) and Sb(V) sorption to jarosite at pH 3 (in dual and single metalloid treatments). Jarosite was found to sorb Sb(V) to a greater extent than As(V) in both single and dual metalloid treatments. Relative to single metalloid treatments, the dual presence of both As(V) and Sb(V) decreased the sorption of both metalloids by almost 50%. Antimony K-edge EXAFS spectroscopy revealed that surface precipitation of an Sb(V) oxide species was the predominant sorption mechanism for Sb(V). In contrast, As K-edge EXAFS spectroscopy showed that As(V) sorption occurred via bidentate corner-sharing complexes on the jarosite surface when Sb(V) was absent or present at low loadings or by formation of similar complexes on the Sb(V) oxide surface precipitate when Sb(V) was present at high loadings. These results point to a novel mechanism by which Sb(V) impacts the co-sorption of As(V). Overall, these findings highlight a strong contrast in the sorption mechanisms of Sb(V) versus As(V) to jarosite under acidic environmental conditions.
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Affiliation(s)
- Niloofar Karimian
- CSIRO, Mineral Resources, Clayton South, Victoria 3169, Australia
- Southern Cross Geoscience, Southern Cross University, Lismore, NSW 2480, Australia
- School of Earth, Atmosphere & Environment, Monash University, Clayton, VIC 3800, Australia
| | - Scott G Johnston
- Southern Cross Geoscience, Southern Cross University, Lismore, NSW 2480, Australia
| | - Ehsan Tavakkoli
- NSW Department of Primary Industries, Wagga Wagga Agricultural Institute, Wagga Wagga, NSW 2650, Australia
- School of Agriculture, Food & Wine, The University of Adelaide, Glen Osmond, SA 5064, Australia
| | - Andrew J Frierdich
- School of Earth, Atmosphere & Environment, Monash University, Clayton, VIC 3800, Australia
| | - Edward D Burton
- Southern Cross Geoscience, Southern Cross University, Lismore, NSW 2480, Australia
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Sun Q, Liu C, Fan T, Cheng H, Cui P, Gu X, Chen L, Ata-Ul-Karim ST, Zhou D, Wang Y. A molecular level understanding of antimony immobilization mechanism on goethite by the combination of X-ray absorption spectroscopy and density functional theory calculations. Sci Total Environ 2023; 865:161294. [PMID: 36592910 DOI: 10.1016/j.scitotenv.2022.161294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 12/08/2022] [Accepted: 12/27/2022] [Indexed: 06/17/2023]
Abstract
A molecular level understanding of antimony (Sb) immobilization mechanism on Fe oxides is required to clarify the fate of Sb in the soil. In this study, macroscopic sorption experiments, combined with extended X-ray absorption fine structure (EXAFS) spectroscopy and density functional theory (DFT), were utilized to explore the interaction between Sb and goethite. The ion strength has no effect on Sb sorption on goethite, indicating the inner-sphere complex Sb formed on goethite. Goethite has the higher sorption potential to Sb(III) than Sb(V), consistent with the higher thermodynamic stability of the geometry for Sb(III) formed on goethite than Sb(V) revealed by DFT calculations. By comparing the Sb-Fe distances obtained by EXAFS spectroscopy and DFT, eight kinds of Sb(III) surface complexes and nine kinds of Sb(V) surface complexes were considered to be the possible geometries Sb formed on different crystal planes of goethite, including monodentate mononuclear, bidentate mononuclear, bidentate binuclear, tridentate mononuclear, tridentate binuclear, tridentate four-nuclear complexes. The structural and energetic details of these filtered geometries provide comprehensive information on Sb immobilization mechanism on goethite, helpful in clarifying the fate of Sb in soils.
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Affiliation(s)
- Qian Sun
- College of Agricultural Sciences and Engineering, Hohai University, Nanjing 210098, China; Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Cun Liu
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008, China
| | - Tingting Fan
- Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection of the People's Republic of China, Nanjing 210008, China
| | - Hu Cheng
- College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Peixin Cui
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008, China
| | - Xueyuan Gu
- State Key Laboratory of Pollution Control and Resource Research, School of Environment, Nanjing University, Nanjing 210008, China
| | - Lina Chen
- College of Agricultural Sciences and Engineering, Hohai University, Nanjing 210098, China
| | - Syed Tahir Ata-Ul-Karim
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Dongmei Zhou
- State Key Laboratory of Pollution Control and Resource Research, School of Environment, Nanjing University, Nanjing 210008, China
| | - Yujun Wang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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30
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Chen PA, Wang HP, Kuznetsov AM, Masliy AN, Liu S, Chiang CL, Korshin GV. XANES/ EXAFS and quantum chemical study of the speciation of arsenic in the condensate formed in landfill gas processing: Evidence of the dominance of As-S species. J Hazard Mater 2023; 445:130522. [PMID: 37055954 DOI: 10.1016/j.jhazmat.2022.130522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 11/14/2022] [Accepted: 11/28/2022] [Indexed: 06/19/2023]
Abstract
The XANES/EXAFS data and quantum chemical simulations presented in this study demonstrate several features of the chemistry of arsenic compounds found in the condensates and solids generated in landfill gas (LFG) processing carried out for renewable natural gas (RNG) production. The XANES data show the decrease in the position of the absorption edge of As atoms, similar to that characteristic for sulfur-containing As solutes and solids. The EXAFS data show that the As-O and As-S distances in these matrixes are similar to those in thioarsenates. Quantum-chemical calculations demonstrated the close agreement between the experimental and modeled As-S and As-O distances determined for a range of methylated and thiolated arsenic solutes. These calculations also showed that the increase of the number of the As-S bonds in the coordination shell of arsenic is accompanied by a consistent decrease of the charges of As atoms. This decrease is correlated with the number of the As-S bonds, in agreement with the trend observed in the XANES data. These results provide insight into the intrinsic chemistry and reactivity of As species present in LFG matrixes; they may be helpful for the development of treatment methods to control arsenic in these systems.
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Affiliation(s)
- Po-An Chen
- Department of Environmental Engineering, National Cheng Kung University, Tainan, Taiwan; Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195-2700, USA
| | - H Paul Wang
- Department of Environmental Engineering, National Cheng Kung University, Tainan, Taiwan
| | - Andrey M Kuznetsov
- Department of Inorganic Chemistry, Kazan National Research Technological University, K. Marx Street 68, 420015, Russian Federation
| | - Alexei N Masliy
- Department of Inorganic Chemistry, Kazan National Research Technological University, K. Marx Street 68, 420015, Russian Federation
| | - Siqi Liu
- Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195-2700, USA
| | | | - Gregory V Korshin
- Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195-2700, USA
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31
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Deans I, Stewart DI, Jones J, Kam J, Mishra B. Uptake and speciation of Zn and Pb by Miscanthus grown in contaminated soils. J Hazard Mater 2023; 445:129899. [PMID: 36493643 DOI: 10.1016/j.jhazmat.2022.129899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 08/22/2022] [Accepted: 08/31/2022] [Indexed: 06/17/2023]
Abstract
The uptake by and distribution of Zn and Pb within a novel seed-based Miscanthus hybrid grown in contaminated soil was assessed. Results from juvenile plants in a pot-trial was compared with data for mature biomass of the same species harvested during a field-trial. Both Zn and Pb uptake by juvenile plants were observed to increase in proportion to the soil concentrations. Both Zn and Pb accumulation differed between leaf and stem structures, and both were different in the mature biomass compared with juvenile plants. Analysis of X-Ray Absorption Fine Structures (XAFS) revealed different Zn speciation in stems and leaves, and differences in Zn speciation with plant maturity. Sulfur ligands consistent with the presence of cysteine rich metallothioneins (MT) and phytochelatin (PC) complexes were the dominant Zn species in juvenile plant leaves, together with octahedral O/N species typified by Zn-malate. Sulfur ligands were also prevalent in stems from juvenile plants, but predominant O/N speciation shifted towards tetrahedral coordination. In contrast, tetrahedral Zn coordination with O/N species predominated in the mature biomass crop. The XAFS spectra for the mature biomass were consistent with Zn being retained within cell walls as pectin and/or phosphate complexes.
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Affiliation(s)
- Innes Deans
- School of Chemical and Process Engineering, University of Leeds, Leeds, United Kingdom
| | - Douglas I Stewart
- School of Civil Engineering, University of Leeds, Leeds, United Kingdom
| | - Jenny Jones
- School of Chemical and Process Engineering, University of Leeds, Leeds, United Kingdom
| | - Jason Kam
- Terravesta Ltd, Lincoln, United Kingdom
| | - Bhoopesh Mishra
- School of Chemical and Process Engineering, University of Leeds, Leeds, United Kingdom; Physics Department, Illinois Institute of Technology, Chicago, United States.
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32
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Falcone E, Nobili G, Okafor M, Proux O, Rossi G, Morante S, Faller P, Stellato F. Chasing the Elusive "In-Between" State of the Copper-Amyloidβ Complex by X-ray Absorption through Partial Thermal Relaxation after Photoreduction. Angew Chem Int Ed Engl 2023:e202217791. [PMID: 36869617 DOI: 10.1002/anie.202217791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 03/03/2023] [Accepted: 03/03/2023] [Indexed: 03/05/2023]
Abstract
The redox activity of Cu ions bound to the amyloid-β (Aβ) peptide is implicated as a source of oxidative stress in the context of Alzheimer's disease. In order to explain the efficient redox cycling between Cu(II)-Aβ (distorted square pyramidal) and Cu(I)-Aβ (digonal) resting states, the existence of a low-populated "in-between" state, prone to bind Cu in both oxidation states, has been postulated. Here, we exploited the partial X-ray induced photoreduction at 10 K, followed by a thermal relaxation at 200 K, to trap and characterize by X-ray Absorption Spectroscopy (XAS) a partially reduced Cu-Aβ1-16 species different from the resting states. Remarkably, the XAS spectrum is well-fitted by a previously proposed model of the "in-between" state, hence providing the first direct spectroscopic characterization of this intermediate state. The present approach could be used to explore and identify the catalytic intermediates of other relevant metal complexes.
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Affiliation(s)
| | - Germano Nobili
- University of Rome Tor Vergata Department of Physics: Universita degli Studi di Roma Tor Vergata Dipartimento di Fisica, Physics, ITALY
| | - Michael Okafor
- University of Strasbourg: Universite de Strasbourg, INCI, FRANCE
| | - Olivier Proux
- Observatoire des Sciences de l'Univers de Grenoble, CNRS, FRANCE
| | - Giancarlo Rossi
- University of Rome Tor Vergata Department of Physics: Universita degli Studi di Roma Tor Vergata Dipartimento di Fisica, Physics, ITALY
| | - Silvia Morante
- University of Rome Tor Vergata Department of Physics: Universita degli Studi di Roma Tor Vergata Dipartimento di Fisica, Physics, ITALY
| | - Peter Faller
- Université de Strasbourg: Universite de Strasbourg, Chemistry, FRANCE
| | - Francesco Stellato
- University of Rome Tor Vergata Department of Physics: Universita degli Studi di Roma Tor Vergata Dipartimento di Fisica, Physics, Via della Ricerca Scientifica, 1, 00133, Roma, ITALY
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Datta R, Pradhan SK, Saha RA, Kumar R, Majumdar S, De SK. A combined study on structural, magnetic and specific heat on double perovskite iridates Ln 2CoIrO 6[Ln = Pr, Nd]. J Phys Condens Matter 2023; 35:125803. [PMID: 36596261 DOI: 10.1088/1361-648x/acafc8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 01/03/2023] [Indexed: 06/17/2023]
Abstract
We report rich magnetic behavior for Co-Ir based double perovskites consisting of different rare earth cations Pr and Nd: Pr2CoIrO6(PCIO) and Nd2CoIrO6(NCIO). Both oxides show an antisite disorder of 10% and a ferrimagnetic transition,TFiMaround 96 K and 98 K respectively. The long range magnetic ordering is arising from the canted antiferromagnetic ordering between the Co2+and Ir4+ions. A prominent peak around 27 K in magnetization data of NCIO indicates that the total moment of Nd ion is antiferromagnetically coupled to the Co-Ir sublattice. The long range order of the Nd sublattice is corroborated by the evidence of an anomaly in specific heat at very low temperature. The compounds exhibit a maximum change of magnetic entropy of 0.57 (0.48) J kg.K-1atTFiMin a magnetic field of 5 T. The strong spin-orbit coupling in 5dstates of Ir and cation disorder lead to the Mott insulating phase as found from the analysis of temperature dependent resistivity. These unique behaviors suggest an interesting interplay between localized Pr/Nd-4f, itinerant Co-3dand Ir-5delectrons.
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Affiliation(s)
- Raktim Datta
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Suman Kalyan Pradhan
- School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | | | - Ravi Kumar
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 094, India
| | - Subham Majumdar
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Subodh Kumar De
- School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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34
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Winterer M, Geiß J. Combining reverse Monte Carlo analysis of X-ray scattering and extended X-ray absorption fine structure spectra of very small nanoparticles. J Appl Crystallogr 2023; 56:103-109. [PMID: 36777145 PMCID: PMC9901930 DOI: 10.1107/s1600576722010858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 11/11/2022] [Indexed: 12/24/2022] Open
Abstract
Finite size effects in partial pair distribution functions generate artefacts in the scattering structure factor and scattering intensity. It is shown how they can be overcome using a binned version of the Debye scattering equation. Accordingly, reverse Monte Carlo simulations are used for very small nanoparticles of LaFeO3 with diameters below 10 nm to simultaneously analyse X-ray scattering data and extended X-ray absorption fine structure spectra at the La K and Fe K edges. The structural information obtained is consistent regarding local structure and long-range order.
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Affiliation(s)
- Markus Winterer
- Nanoparticle Process Technology and CENIDE (Center for Nanointegration Duisburg-Essen), University of Duisburg-Essen, Lotharstrasse 1, 47057 Duisberg, Germany,Correspondence e-mail:
| | - Jeremias Geiß
- Nanoparticle Process Technology and CENIDE (Center for Nanointegration Duisburg-Essen), University of Duisburg-Essen, Lotharstrasse 1, 47057 Duisberg, Germany
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35
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Rastegari M, Karimian N, Johnston SG, Doherty SJ, Hamilton JL, Choppala G, Hosseinpour Moghaddam M, Burton ED. Antimony(V) Incorporation into Schwertmannite: Critical Insights on Antimony Retention in Acidic Environments. Environ Sci Technol 2022; 56:17776-17784. [PMID: 36445713 DOI: 10.1021/acs.est.2c07341] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
This study examines incorporation of Sb(V) into schwertmannite─an Fe(III) oxyhydroxysulfate mineral that can be an important Sb host phase in acidic environments. Schwertmannite was synthesized from solutions containing a range of Sb(V)/Fe(III) ratios, and the resulting solids were investigated using geochemical analysis, powder X-ray diffraction (XRD), dissolution kinetic experiments, and extended X-ray absorption fine structure (EXAFS) spectroscopy. Shell-fitting and wavelet transform analyses of Sb K-edge EXAFS data, together with congruent Sb and Fe release during schwertmannite dissolution, indicate that schwertmannite incorporates Sb(V) via heterovalent substitution for Fe(III). Elemental analysis combined with XRD and Fe K-edge EXAFS spectroscopy shows that schwertmannite can incorporate Sb(V) via this mechanism at up to about 8 mol % substitution when formed from solutions having Sb/Fe ratios ≤0.04 (higher ratios inhibit schwertmannite formation). Incorporation of Sb(V) into schwertmannite involves formation of edge and double-corner sharing linkages between SbVO6 and FeIII(O,OH)6 octahedra which strongly stabilize schwertmannite against dissolution. This implies that Sb(V)-coprecipitated schwertmannite may represent a potential long-term sink for Sb in acidic environments.
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Affiliation(s)
- Mohammad Rastegari
- Faculty of Science and Engineering, Southern Cross University, Lismore, NSW 2480, Australia
| | - Niloofar Karimian
- School of Earth, Atmosphere & Environment, Monash University, Clayton, VIC 3800, Australia
- CSIRO Mineral Resources, Clayton South, VIC 3169, Australia
| | - Scott G Johnston
- Faculty of Science and Engineering, Southern Cross University, Lismore, NSW 2480, Australia
| | - Steven J Doherty
- Faculty of Science and Engineering, Southern Cross University, Lismore, NSW 2480, Australia
- School of Environmental and Rural Science, University of New England, Armidale, NSW 2350, Australia
| | | | - Girish Choppala
- Global Centre for Environmental Remediation (GCER), University of Newcastle, Callaghan, NSW 2308, Australia
| | | | - Edward D Burton
- Faculty of Science and Engineering, Southern Cross University, Lismore, NSW 2480, Australia
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Mazzucato M, Gavioli L, Balzano V, Berretti E, Rizzi GA, Badocco D, Pastore P, Zitolo A, Durante C. Synergistic Effect of Sn and Fe in Fe-N x Site Formation and Activity in Fe-N-C Catalyst for ORR. ACS Appl Mater Interfaces 2022; 14:54635-54648. [PMID: 36468946 PMCID: PMC9756292 DOI: 10.1021/acsami.2c13837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 11/22/2022] [Indexed: 06/17/2023]
Abstract
Iron-nitrogen-carbon (Fe-N-C) materials emerged as one of the best non-platinum group material (non-PGM) alternatives to Pt/C catalysts for the electrochemical reduction of O2 in fuel cells. Co-doping with a secondary metal center is a possible choice to further enhance the activity toward oxygen reduction reaction (ORR). Here, classical Fe-N-C materials were co-doped with Sn as a secondary metal center. Sn-N-C according to the literature shows excellent activity, in particular in the fuel cell setup; here, the same catalyst shows a non-negligible activity in 0.5 M H2SO4 electrolyte but not as high as expected, meaning the different and uncertain nature of active sites. On the other hand, in mixed Fe, Sn-N-C catalysts, the presence of Sn improves the catalytic activity that is linked to a higher Fe-N4 site density, whereas the possible synergistic interaction of Fe-N4 and Sn-Nx found no confirmation. The presence of Fe-N4 and Sn-Nx was thoroughly determined by extended X-ray absorption fine structure and NO stripping technique; furthermore, besides the typical voltammetric technique, the catalytic activity of Fe-N-C catalyst was determined and also compared with that of the gas diffusion electrode (GDE), which allows a fast and reliable screening for possible implementation in a full cell. This paper therefore explores the effect of Sn on the formation, activity, and selectivity of Fe-N-C catalysts in both acid and alkaline media by tuning the Sn/Fe ratio in the synthetic procedure, with the ratio 1/2 showing the best activity, even higher than that of the iron-only containing sample (jk = 2.11 vs 1.83 A g-1). Pt-free materials are also tested for ORR in GDE setup in both performance and durability tests.
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Affiliation(s)
- Marco Mazzucato
- Department
of Chemical Sciences, University of Padova, Via Marzolo 1, 35131Padova, Italy
| | - Luca Gavioli
- i-LAMP
& Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Via della Garzetta 46, 25133Brescia, Italy
| | - Vincenzo Balzano
- i-LAMP
& Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Via della Garzetta 46, 25133Brescia, Italy
| | - Enrico Berretti
- Institute
of Chemistry of Organometallic Compounds (ICCOM)—National Research
Council (CNR), Via Madonna
del Piano 10, 50019Sesto Fiorentino, Italy
| | - Gian Andrea Rizzi
- Department
of Chemical Sciences, University of Padova, Via Marzolo 1, 35131Padova, Italy
| | - Denis Badocco
- Department
of Chemical Sciences, University of Padova, Via Marzolo 1, 35131Padova, Italy
| | - Paolo Pastore
- Department
of Chemical Sciences, University of Padova, Via Marzolo 1, 35131Padova, Italy
| | - Andrea Zitolo
- Synchrotron
SOLEIL, L’Orme des Merisiers, BP 48 Saint Aubin, 91192Gif-sur-Yvette, France
| | - Christian Durante
- Department
of Chemical Sciences, University of Padova, Via Marzolo 1, 35131Padova, Italy
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Mullaliu A, Hosseini SM, Conti P, Aquilanti G, Giorgetti M, Varzi A, Passerini S. Disclosing the Redox Pathway Behind the Excellent Performance of CuS in Solid-State Batteries. Small Methods 2022; 6:e2200913. [PMID: 36333102 DOI: 10.1002/smtd.202200913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 09/20/2022] [Indexed: 06/16/2023]
Abstract
Copper sulfide has attracted increasing attention as conversion-type cathode material for, especially, solid-state lithium-based batteries. However, the reaction mechanism behind its extraordinary electroactivity is not well understood, and the various explanations given by the scientific community are diverging. Herein, the CuS reaction dynamics are highlighted by examining the occurring redox processes via a cutting-edge methodology combining X-ray absorption fine structure spectroscopy, and chemometrics to overcome X-ray diffraction limitations posed by the poor material's crystallinity. The mathematical approach rules out the formation of intermediates and clarifies the direct conversion of CuS to Cu in a two-electron process during discharge and reversible oxidation upon delithiation. Two distinct voltage regions are identified corresponding to Cu- as well as the S-redox mechanisms occurring in the material.
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Affiliation(s)
- Angelo Mullaliu
- Helmholtz Institute Ulm (HIU), 89081, Ulm, Germany
- Karlsruhe Institute of Technology (KIT), 76021, Karlsruhe, Germany
| | - Seyed Milad Hosseini
- Helmholtz Institute Ulm (HIU), 89081, Ulm, Germany
- Karlsruhe Institute of Technology (KIT), 76021, Karlsruhe, Germany
| | - Paolo Conti
- School of Science and Technology, Chemistry Division, University of Camerino, Chemistry Interdisciplinary Project Building Via Madonna delle Carceri, 62032, Camerino, Italy
| | | | - Marco Giorgetti
- Department of Industrial Chemistry "Toso Montanari", University of Bologna, 40136, Bologna, Italy
| | - Alberto Varzi
- Helmholtz Institute Ulm (HIU), 89081, Ulm, Germany
- Karlsruhe Institute of Technology (KIT), 76021, Karlsruhe, Germany
| | - Stefano Passerini
- Helmholtz Institute Ulm (HIU), 89081, Ulm, Germany
- Karlsruhe Institute of Technology (KIT), 76021, Karlsruhe, Germany
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38
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Song Z, Li J, Davis KD, Li X, Zhang J, Zhang L, Sun X. Emerging Applications of Synchrotron Radiation X-Ray Techniques in Single Atomic Catalysts. Small Methods 2022; 6:e2201078. [PMID: 36207288 DOI: 10.1002/smtd.202201078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Indexed: 06/16/2023]
Abstract
Single atom catalysts (SACs) can achieve a maximum atom utilization efficiency of 100%, which provides significantly increased active sites compared with traditional catalysts during catalytic reactions. Synchrotron radiation technology is an important characterization method for identifying single-atom catalysts. Several types of internal information, such as the coordination number, bond length and electronic structure of metals, can all be analyzed. This review will focus on the introduction of synchrotron radiation techniques and their applications in SACs. First, the fundamentals of synchrotron radiation and the corresponding techniques applied in characterization of SACs will be briefly introduced, such as X-ray absorption near edge spectroscopy and extended X-ray absorption fine structure spectroscopy and in situ techniques. The detailed information obtained from synchrotron radiation X-ray characterization is described through four routes: 1) the local environment of a specific atom; 2) the oxidation state of SACs; 3) electronic structures at different orbitals; and 4) the in situ structure modification during catalytic reaction. In addition, a systematic summary of synchrotron radiation X-ray characterization on different types of SACs (noble metals and transition metals) will be discussed.
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Affiliation(s)
- Zhongxin Song
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Junjie Li
- Department of Mechanical and Materials Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada
| | - Kieran Doyle Davis
- Department of Mechanical and Materials Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada
| | - Xifei Li
- Xi'an Key Laboratory of New Energy Materials and Devices, Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, 710048, China
| | - Jiujun Zhang
- Institute for New Energy Materials and Engineering/College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
- Institute for Sustainable Energy/College of Sciences, Shanghai University, Shanghai, 200444, China
| | - Lei Zhang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Xueliang Sun
- Department of Mechanical and Materials Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada
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Gou W, Mo X, Ren C, Wang H, Li W. Formation of crystalline multimetallic layered double hydroxide precipitates during uptake of Co, Ni, and Zn onto γ-alumina: Evidence from EXAFS, XRD, and TEM. Chemosphere 2022; 307:136055. [PMID: 35977580 DOI: 10.1016/j.chemosphere.2022.136055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 07/28/2022] [Accepted: 08/08/2022] [Indexed: 06/15/2023]
Abstract
While the phenomenon of surface adsorption of heavy metals occurring at the mineral-water interface is well understood, the mechanisms of surface precipitation in controlling the fate of heavy metals in soils and water have not been clearly addressed. In this research, we used a combination of extended X-ray absorption fine structure (EXAFS) spectroscopy, high-resolution transmission electron microscopy (HRTEM), and X-ray diffraction (XRD) to determine the uptake mechanisms of Co, Ni, and Zn on γ-Al2O3 at pH 7.5. EXAFS analysis revealed the formation of multimetallic layered double hydroxides (LDHs), and the Me-Me distances (Me = Co, Ni, and Zn) of the multimetallic LDH were inversely correlated with the molar ratio of the sorbed Ni and the sorbed total metals. The HRTEM analysis showed that flake or needle-like shapes of the LDH precipitate formed at the nanoscale. Additionally, XRD suggested that these multimetallic LDHs were crystalline, and the crystallinity was dependent on the heavy metal type. This provides, for the first time, experimental evidence for the formation of CoNiZn-Al LDH precipitates at mineral-water interfaces. These results have pronounced environmental implications in heavy metal remediation, reactive transport modeling, and environmental risk assessment.
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Affiliation(s)
- Wenxian Gou
- Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; Frontiers Science Center for Critical Earth Material Cycling (FSC-CEMaC), Nanjing University, Nanjing, 210023, China
| | - Xinxin Mo
- Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; Frontiers Science Center for Critical Earth Material Cycling (FSC-CEMaC), Nanjing University, Nanjing, 210023, China
| | - Chao Ren
- Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; Frontiers Science Center for Critical Earth Material Cycling (FSC-CEMaC), Nanjing University, Nanjing, 210023, China
| | - Hongtao Wang
- Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; Frontiers Science Center for Critical Earth Material Cycling (FSC-CEMaC), Nanjing University, Nanjing, 210023, China
| | - Wei Li
- Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; Frontiers Science Center for Critical Earth Material Cycling (FSC-CEMaC), Nanjing University, Nanjing, 210023, China.
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Dussert F, Sarret G, Wegner KD, Proux O, Landrot G, Jouneau PH, Reiss P, Carrière M. Physico-Chemical Transformation and Toxicity of Multi-Shell InP Quantum Dots under Simulated Sunlight Irradiation, in an Environmentally Realistic Scenario. Nanomaterials (Basel) 2022; 12:3703. [PMID: 36296892 PMCID: PMC9611924 DOI: 10.3390/nano12203703] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 10/14/2022] [Accepted: 10/17/2022] [Indexed: 06/16/2023]
Abstract
Quantum dots (QDs) are widely used in optoelectronics, lighting, and photovoltaics leading to their potential release into the environment. The most promising alternative to the highly toxic cadmium selenide (CdSe) QDs are indium phosphide (InP) QDs, which show reduced toxicity and comparable optical and electronic properties. QD degradation leads to the release of toxic metal ions into the environment. Coating the QD core with robust shell(s) composed of another semi-conductor material enhances their properties and protects the QD from degradation. We recently developed double-shelled InP QDs, which proved to be less toxic than single-shell QDs. In the present study, we confirm their reduced cytotoxicity, with an LC50 at 77 nM for pristine gradient shell QDs and >100 nM for pristine thin and thick shell QDs. We also confirm that these three QDs, when exposed to simulated sunlight, show greater cytotoxicity compared to pristine ones, with LC50 ranging from 15 to 23 nM. Using a combination of spectroscopic and microscopic techniques, we characterize the degradation kinetics and transformation products of single- and double-shell QDs, when exposed to solar light at high temperature, simulating environmental conditions. Non-toxic pristine QDs degrade to form toxic In−phosphate, In−carboxylate, Zn−phosphate, and oxidized Se, all of which precipitate as heterogeneous deposits. Comparison of their degradation kinetics highlights that the QDs bearing the thickest ZnS outer shell are, as expected, the most resistant to photodegradation among the three tested QDs, as gradient shell, thin shell, and thick shell QDs lose their optical properties in less than 15 min, 60 min, and more than 90 min, respectively. They exhibit the highest photoluminescence efficiency, i.e., the best functionality, with a photoluminescence quantum yield in aqueous solution of 24%, as compared to 18% for the gradient shell and thin shell QDs. Therefore, they can be considered as safer-by-design QDs.
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Affiliation(s)
- Fanny Dussert
- University Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, CIBEST, 38000 Grenoble, France
| | - Géraldine Sarret
- University Grenoble Alpes, University Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000 Grenoble, France
| | - Karl David Wegner
- University Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, STEP, 38000 Grenoble, France
| | - Olivier Proux
- University Grenoble Alpes, CNRS, IRD, Météo-France, INRAE, Observatoire des Sciences de l’Univers de Grenoble (OSUG), UAR 832 CNRS, 38400 Saint Martin d’Hères, France
| | - Gautier Landrot
- Synchrotron SOLEIL, L’Orme des Merisiers, 91190 Saint Aubin, France
| | | | - Peter Reiss
- University Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, STEP, 38000 Grenoble, France
| | - Marie Carrière
- University Grenoble Alpes, CEA, CNRS, IRIG-SyMMES, CIBEST, 38000 Grenoble, France
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Perdrial N, Vázquez-Ortega A, Reinoso-Maset E, O'Day PA, Chorover J. Effects of flow on uranium speciation in soils impacted by acidic waste fluids. J Environ Radioact 2022; 251-252:106955. [PMID: 35772319 DOI: 10.1016/j.jenvrad.2022.106955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 06/07/2022] [Accepted: 06/21/2022] [Indexed: 06/15/2023]
Abstract
Radioactive acidic liquid waste is a common byproduct of uranium (U) and plutonium (Pu) enrichment and recycling processes whose accidental and planned release has led to a significant input of U into soils and sediments across the world, including at the U.S. DOE's Hanford site (WA, USA). Because of the particularly hazardous nature of U, it is important to predict its speciation when introduced into soils and sediments by acidic waste fluids. Of fundamental importance are the coupled effects of acid-driven mineral transformation and reactive transport on U speciation. To evaluate the effect of waste-fluid residence time and co-associated dissolved phosphate concentrations on U speciation in impacted soils and sediments, uncontaminated surface materials (from the Hanford Site) were reacted with U-containing synthetic acidic waste fluids (pH 2) amended with dissolved phosphate concentrations in both batch (no flow) and flow-through column systems for 7-365 days. By comparing dissolved U behavior and solid phase speciation as a function of flow regimen, we found that the availability of proton-promoted dissolution products (such as Si) to sequester U into uranyl silicates was dependent on waste fluid-sediment contact time as uranyl silicates were not detected in short contact time flow-through systems but were detected in no-flow, long contact time, reactors. Moreover, the dominance of uranyl phosphate as neoprecipitate U scavenger (principally in the form of meta-ankoleite) in phosphate amended systems confirmed the importance of phosphate amendments for an efficient sequestration of U in the soils and sediments. Overall, our experiments suggest that the formation of uranyl silicates in soils impacted by acidic waste fluids is likely to be limited unless reaction products are allowed to accumulate in soil pores, highlighting the importance of investigating soil U speciation in flow-through, transport-driven systems as opposed to no-flow, batch systems. This study provides insights into uranium speciation and its potential changes under acidic conditions for better prediction of risks and subsequent development of efficient remediation strategies.
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Affiliation(s)
- Nicolas Perdrial
- Department of Environmental Science, University of Arizona, 1177 East Fourth Street, Tucson, AZ, 85721, USA; Department of Geography & Geosciences, University of Vermont, 180 Colchester Avenue, Burlington, Vermont 05405, USA.
| | - Angélica Vázquez-Ortega
- Department of Environmental Science, University of Arizona, 1177 East Fourth Street, Tucson, AZ, 85721, USA
| | - Estela Reinoso-Maset
- Sierra Nevada Research Institute, University of California Merced, 5200 North Lake Road, Merced, CA, 95343, USA; Centre for Environmental Radioactivity CoE, Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, 1432 Aas, Norway
| | - Peggy A O'Day
- Sierra Nevada Research Institute, University of California Merced, 5200 North Lake Road, Merced, CA, 95343, USA; Life and Environmental Sciences Department, School of Natural Sciences, University of California - Merced, 5200 North Lake Road, Merced, CA, 95343, USA
| | - Jon Chorover
- Department of Environmental Science, University of Arizona, 1177 East Fourth Street, Tucson, AZ, 85721, USA
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Yurkov G, Koksharov Y, Fionov A, Taratanov N, Kolesov V, Kirillov V, Makeev M, Mikhalev P, Ryzhenko D, Solodilov V. Polymer Nanocomposite Containing Palladium Nanoparticles: Synthesis, Characterization, and Properties. Polymers (Basel) 2022; 14:3795. [PMID: 36145940 PMCID: PMC9503152 DOI: 10.3390/polym14183795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 09/05/2022] [Accepted: 09/06/2022] [Indexed: 12/03/2022] Open
Abstract
Composite nanomaterials have been prepared through thermal decomposition of palladium diacetate. The composite contains palladium nanoparticles embedded in high-pressure polyethylene. The materials were studied by a number of different physico-chemical methods, such as transmission electron microscopy, X-ray diffraction, X-ray absorption spectroscopy, electron paramagnetic resonance, and EXAFS. The average size of the nanoparticles is 7.0 ± 0.5 nm. It is shown that with the decrease of metal content in the polymer matrix the average size of nanoparticles decreased from 7 to 6 nm, and the coordination number of palladium also decreased from 7 to 5.7. The mean size of palladium particles increases with the growing concentration of palladium content in the matrix. It is shown that the electrophysical properties of the material obtained depend on the filler concentration. The chemical composition of palladium components includes metallic palladium, palladium (III) oxide, and palladium dioxide. All samples have narrow lines (3-5 Oe) with a g factor of around two in the electron paramagnetic resonance (EPR) spectra. It is shown that EPR lines have uneven boarding by saturation lines investigation. The relaxation component properties are different for spectral components. It leads to the spectrum line width depending on the magnetic field value. At first approximation, the EPR spectra can be described as a sum of two Lorentzian function graphs, corresponding to the following two paramagnetic centers: one is on the surface, and one is inside the palladium particles. Some of the experimental characteristics were measured for the first time. The data obtained indicate interesting properties of palladium-based nanocomposites, which will be useful for obtaining products based on these materials.
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Affiliation(s)
- Gleb Yurkov
- N.N. Semenov Federal Research Center of Chemical Physics of Russian Academy of Sciences, 119334 Moscow, Russia
- Department of Structurally Sensitive Functional Materials, Bauman Moscow State Technical University, BMSTU, 2-nd Baumanskaya, 5, 105005 Moscow, Russia
| | - Yury Koksharov
- Faculty of Physics, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Alexander Fionov
- Kotelnikov Institute of Radio Engineering and Electronics of Russian Academy of Science, 125009 Moscow, Russia
| | - Nikolai Taratanov
- Ivanovo Institute of State Fire Service of Emercom of Russia, 153040 Ivanovo, Russia
| | - Vladimir Kolesov
- Kotelnikov Institute of Radio Engineering and Electronics of Russian Academy of Science, 125009 Moscow, Russia
| | - Vladislav Kirillov
- N.N. Semenov Federal Research Center of Chemical Physics of Russian Academy of Sciences, 119334 Moscow, Russia
| | - Mstislav Makeev
- Department of Structurally Sensitive Functional Materials, Bauman Moscow State Technical University, BMSTU, 2-nd Baumanskaya, 5, 105005 Moscow, Russia
| | - Pavel Mikhalev
- Department of Structurally Sensitive Functional Materials, Bauman Moscow State Technical University, BMSTU, 2-nd Baumanskaya, 5, 105005 Moscow, Russia
| | - Dmitriy Ryzhenko
- Department of Structurally Sensitive Functional Materials, Bauman Moscow State Technical University, BMSTU, 2-nd Baumanskaya, 5, 105005 Moscow, Russia
| | - Vitaliy Solodilov
- N.N. Semenov Federal Research Center of Chemical Physics of Russian Academy of Sciences, 119334 Moscow, Russia
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Burton ED, Lamb DT, Hamilton J, Miller G, Johnston SG, Karimian N. Remediation of Pb-contaminated soil using modified bauxite refinery residue. J Hazard Mater 2022; 437:129339. [PMID: 35709620 DOI: 10.1016/j.jhazmat.2022.129339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 05/20/2022] [Accepted: 06/07/2022] [Indexed: 06/15/2023]
Abstract
This study examines amendment of Pb-contaminated soil with modified bauxite refinery residue (MBRR) to decrease soil Pb mobility and bioaccessibility. Amendment experiments were conducted using four soils contaminated with Pb from various sources, including smelting, shooting-range activities and Pb-based paint waste. Lead L3-edge X-ray absorption spectroscopy (XAS) indicated that Pb speciation in these soils was a mixture of Pb sorbed to Fe (hydr)oxide and clay minerals, along with Pb bound to organic matter. Amendment with MBRR decreased water-soluble Pb and/or Toxicity Characteristic Leachate Procedure (TCLP) Pb concentrations. Lead L3-edge XAS and X-ray diffraction (XRD) indicated that Pb retention by MBRR occurred via sorption to Fe- and Al-(hydr)oxides at low Pb loadings, in addition to formation of hydrocerussite (Pb3(CO3)2(OH)2) at high loadings. Soil amendment with MBRR had relatively little effect on gastric-phase Pb bioaccessibility; as quantified via the Solubility/Bioavailability Research Consortium, SBRC, in vitro assay. In contrast, amendment with MBRR caused substantial decreases in relative intestinal-phase Pb bioaccessibility (Rel-SBRC-I) due to increased Pb sorption by MBRR's Fe- and Al-hydr(oxide) minerals as simulated GI tract conditions shifted from the gastric- to the intestinal-phase. These decreases in Rel-SBRC-I point to the potential efficacy of using amendment with MBRR to decrease soil Pb bioavailability.
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Affiliation(s)
- Edward D Burton
- Faculty of Science & Engineering, Southern Cross University, Lismore, New South Wales 2480, Australia.
| | - Dane T Lamb
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | | | - Graeme Miller
- Faculty of Science & Engineering, Southern Cross University, Lismore, New South Wales 2480, Australia; Senversa Pty Ltd, Adelaide, SA 5000, Australia
| | - Scott G Johnston
- Faculty of Science & Engineering, Southern Cross University, Lismore, New South Wales 2480, Australia
| | - Niloofar Karimian
- Faculty of Science & Engineering, Southern Cross University, Lismore, New South Wales 2480, Australia; CSIRO Mineral Resources, Clayton South, VIC 3169, Australia
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Imam NG, Harfouche M, Azab AA, Solyman S. Coupling between γ-irradiation and synchrotron-radiation-based XAFS techniques for studying Mn-doped ZnO nanoparticles. J Synchrotron Radiat 2022; 29:1187-1197. [PMID: 36073877 PMCID: PMC9455205 DOI: 10.1107/s1600577522006439] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Accepted: 06/21/2022] [Indexed: 06/15/2023]
Abstract
γ-Irradiation and synchrotron-radiation-based X-ray absorption fine-structure (XAFS) spectroscopy have been used to induce structure disorder through the interaction of γ-rays (200 kGy) with fabricated Mn-doped ZnO nanoparticles (NPs) and then to examine thoroughly the resultant structural change. The extracted electronic/fine XAFS structural parameters reflect a compositional and γ-irradiation co-dependence. The average crystal structure of samples prepared by the sol-gel method was investigated by X-ray diffraction (XRD). A detailed structural XRD data analysis was carried out by applying a Rietveld refinement using the MAUD program. XAFS spectra were collected at the Zn K-edge (9659 eV) in transmission mode and at the Mn K-edge (6539 eV) in fluorescence mode. Direct evidence of the solubility of Mn ions in the ZnO structure was demonstrated by fitting the extended-XAFS (EXAFS) signal. Near-edge XAFS (XANES) analysis provided the oxidation states of Zn and Mn ions through fingerprint XANES spectra of the sample along with those of standard compounds. Linear combination fitting showed that the most fit chemical forms of Zn and Mn in the samples are ZnO and MnO, respectively. The oxidation states of both Zn and Mn XAFS absorbers were confirmed from pre-edge fitting. The results of the magnetic measurements were explained in light of the average and electronic/local structural information obtained from XRD, XANES and EXAFS techniques. The magnetic properties of the samples translate into an induced change in the average crystal and electronic/local structures upon Mn concentration change and γ-irradiation. XRD confirmed the successful preparation of hexagonal Mn-doped ZnO NPs with a crystallite size in the range 33-41 nm. Both XRD and EXAFS analysis detected a minor amount of Mn3O4 as a secondary phase. XANES and EXAFS provided information exploring the outstanding potential of the utilized protocol for detecting precisely the presence of the secondary phase of Mn3O4, which changes with Mn content (x). Mean-square relative displacement (σ2) values extracted from the EXAFS fitting were found to grow for Zn-Zn/Mn paths demonstrating the substitution of Mn/Zn into Zn crystal sites. The EXAFS analysis explains the reasons behind the enhancement in the magnetic properties and shows that the Mn doping content at x = 0.05 produces the most local atomic disorder in ZnO NPs. There is a strong harmony among the XRD, XANES, EXAFS and magnetization behavior of the Mn-doped ZnO NPs. Maximum magnetization was acquired at an Mn content of 0.05. γ-Ray-irradiated Zn1-xMnxO NPs are recommended as optimized candidates for showing the diversity of the applications.
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Affiliation(s)
- N. G. Imam
- Experimental Nuclear Physics Department (Solid State Laboratory), Nuclear Research Center (NRC), Egyptian Atomic Energy Authority (EAEA), Cairo 13759, Egypt
| | - Messaoud Harfouche
- Synchrotron-Light for Experimental and Scientific Applications in the Middle East (SESAME), PO Box 7, Allan 19252, Jordan
| | - A. A. Azab
- Solid State Physics Department, Physics Research Institute, National Research Centre, 33 El Bohouth Street, Dokki, 12622 Giza, Egypt
| | - S. Solyman
- Physics Department, Faculty of Science, Zagazig University, Zagazig, Egypt
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Gupta SK, Abdou H, Segre CU, Mao Y. Excitation-Dependent Photoluminescence of BaZrO 3:Eu 3+ Crystals. Nanomaterials (Basel) 2022; 12:3028. [PMID: 36080065 PMCID: PMC9457899 DOI: 10.3390/nano12173028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 08/25/2022] [Accepted: 08/25/2022] [Indexed: 06/15/2023]
Abstract
The elucidation of local structure, excitation-dependent spectroscopy, and defect engineering in lanthanide ion-doped phosphors was a focal point of research. In this work, we have studied Eu3+-doped BaZrO3 (BZOE) submicron crystals that were synthesized by a molten salt method. The BZOE crystals show orange-red emission tunability under the host and dopant excitations at 279 nm and 395 nm, respectively, and the difference is determined in terms of the asymmetry ratio, Stark splitting, and intensity of the uncommon 5D0 → 7F0 transition. These distinct spectral features remain unaltered under different excitations for the BZOE crystals with Eu3+ concentrations of 0-10.0%. The 2.0% Eu3+-doped BZOE crystals display the best optical performance in terms of excitation/emission intensity, lifetime, and quantum yield. The X-ray absorption near the edge structure spectral data suggest europium, barium, and zirconium ions to be stabilized in +3, +2, and +4 oxidation states, respectively. The extended X-ray absorption fine structure spectral analysis confirms that, below 2.0% doping, the Eu3+ ions occupy the six-coordinated Zr4+ sites. This work gives complete information about the BZOE phosphor in terms of the dopant oxidation state, the local structure, the excitation-dependent photoluminescence (PL), the concentration-dependent PL, and the origin of PL. Such a complete photophysical analysis opens up a new pathway in perovskite research in the area of phosphors and scintillators with tunable properties.
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Affiliation(s)
- Santosh K. Gupta
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
- Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India
| | - Hisham Abdou
- Department of Chemistry, University of Texas Rio Grande Valley, 1201 West University Drive, Edinburg, TX 78539, USA
| | - Carlo U. Segre
- Center for Synchrotron Radiation Research and Instrumentation and Department of Physics, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Yuanbing Mao
- Department of Chemistry, Illinois Institute of Technology, 3105 South Dearborn Street, Chicago, IL 60616, USA
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Abbasi S, Lamb DT, Choppala G, Burton ED, Megharaj M. Antimony speciation, phytochelatin stimulation and toxicity in plants. Environ Pollut 2022; 305:119305. [PMID: 35430314 DOI: 10.1016/j.envpol.2022.119305] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 04/08/2022] [Accepted: 04/11/2022] [Indexed: 06/14/2023]
Abstract
Antimony (Sb) is a toxic metalloid that has been listed as a priority pollutant. The environmental impacts of Sb have recently attracted attention, but its phytotoxicity and biological transformation remain poorly understood. In this study, Sb speciation and transformation in plant roots was quantified by Sb K-edge X-ray absorption spectroscopy. In addition, the phytotoxicity of antimonate (SbV) on six plant species was assessed by measuring plant photosynthesis, growth, and phytochelatin production induced by SbV. Linear combination fitting of the Sb K-edge X-ray absorption near-edge structure (XANES) spectra indicated reduction of SbV was limited to ∼5-33% of Sb. The data confirmed that Sb-polygalacturonic acid was the predominant chemical form in all plant species (up to 95%), indicating Sb was primarily bound to the cell walls of plant roots. Shell fitting of Sb K-edge X-ray absorption fine-structure (EXAFS) spectra confirmed Sb-O and Sb-C were the dominant scattering paths. The fitting indicated that SbV was bound to hydroxyl functional groups of cell walls, via development of a local coordination environment analogous to Sb-polygalacturonic acid. This is the first study to demonstrate the key role of plant cell walls in Sb metabolism.
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Affiliation(s)
- Sepide Abbasi
- Global Centre for Environmental Remediation (GCER), The University of Newcastle, Callaghan, New South Wales, Australia; Environmental Resources Management (ERM), Sydney, Australia
| | - Dane T Lamb
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria, 3000, Australia.
| | - Girish Choppala
- Global Centre for Environmental Remediation (GCER), The University of Newcastle, Callaghan, New South Wales, Australia
| | - Edward D Burton
- Faculty of Science and Engineering, Southern Cross University, Lismore, New South Wales, 2480, Australia
| | - Mallavarapu Megharaj
- Global Centre for Environmental Remediation (GCER), The University of Newcastle, Callaghan, New South Wales, Australia
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Harfouche M, Abdellatief M, Momani Y, Abbadi A, Al Najdawi M, Al Zoubi M, Aljamal B, Matalgah S, Khan LU, Lausi A, Paolucci G. Emergence of the first XAFS/XRF beamline in the Middle East: providing studies of elements and their atomic/electronic structure in pluridisciplinary research fields. J Synchrotron Radiat 2022; 29:1107-1113. [PMID: 35787578 PMCID: PMC9255566 DOI: 10.1107/s1600577522005215] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 05/14/2022] [Indexed: 06/15/2023]
Abstract
XAFS/XRF is a general-purpose absorption spectroscopy beamline at the Synchrotron-light for Experimental Science and Applications in the Middle East (SESAME), Jordan. Herein, its optical layout is presented along with its powerful capabilities in collecting absorption and fluorescence spectra within a wide energy range (4.7-30 keV). The beamline is equipped with a conventional fixed-exit double-crystal monochromator that allows the collection of an X-ray absorption spectrum within a few minutes in step-by-step mode. An on-the-fly scanning mode will be implemented shortly where the acquisition time will be reduced to less than a minute per scan. The full automation of the beamline allows performing successive measurements under different conditions. The different experimental setups and special features available to users are reported. Examples of XRF and XAFS measurements are presented, showing the performance of the beamline under different standard conditions.
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Affiliation(s)
- Messaoud Harfouche
- SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East), Allan 19252, Jordan
| | - Mahmoud Abdellatief
- SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East), Allan 19252, Jordan
| | - Yazeed Momani
- SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East), Allan 19252, Jordan
| | - Anas Abbadi
- SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East), Allan 19252, Jordan
| | - Mohammad Al Najdawi
- SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East), Allan 19252, Jordan
| | - Mustafa Al Zoubi
- SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East), Allan 19252, Jordan
| | - Basil Aljamal
- SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East), Allan 19252, Jordan
| | - Salman Matalgah
- SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East), Allan 19252, Jordan
| | - Latif U. Khan
- SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East), Allan 19252, Jordan
| | - Andrea Lausi
- SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East), Allan 19252, Jordan
- Elettra-Sincrotrone Trieste SCpA, Strada Statale 14 – km 163,5 in AREA Science Park, Basovizza/Trieste 34149, Italy
| | - Giorgio Paolucci
- Elettra-Sincrotrone Trieste SCpA, Strada Statale 14 – km 163,5 in AREA Science Park, Basovizza/Trieste 34149, Italy
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Zhang J, Coker VS, Mosselmans JFW, Shaw S. Adsorption of octahedral mono-molybdate and poly-molybdate onto hematite: A multi-technique approach. J Hazard Mater 2022; 431:128564. [PMID: 35359098 DOI: 10.1016/j.jhazmat.2022.128564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 01/31/2022] [Accepted: 02/22/2022] [Indexed: 06/14/2023]
Abstract
Molybdenum (Mo) is a key trace element and a contaminant in many environments including mine tailings and acid mine drainage systems. Under oxic conditions Mo exists in a number of forms, including mono-molybdate (Mo(VI)O42-) and various poly-molybdate species (e.g. Mo(VI)7O246-) depending on the geochemical conditions (e.g. pH). The mobility and bioavailability of Mo is often controlled by sorption to mineral surfaces, including iron (oxyhydr)oxides e.g. hematite (Fe2O3). This study uses adsorption isotherms, PHREEQC geochemical modeling, Attenuated Total Reflection-Fourier Transform Infrared Spectroscopy (ATR-FTIR), and X-ray Absorption Spectroscopy (XAS) to holistically characterise the molecular scale adsorption of molybdate to hematite as a function of pH (3-12) and Mo(VI) concentration (0.01 × 10-4 - 2 × 10-3 M). PHREEQC and ATR-FTIR indicated both pH and Mo concentration are important variables when forming mono- vs. poly- molybdate and suggest low pH (≤ 4) and high Mo(VI) concentration (≥ 5 × 10-4 M) contribute to the formation of a poly-molybdate surface species on the hematite surface. XAS found Mo adsorbed to hematite via an inner-sphere corner-sharing bidentate binuclear complex with an octahedral mono-molybdate structure at a Mo concentration of 0.6 × 10-4 M across the pH range, and at a Mo(VI) concentration of 5 × 10-4 M and pH over 5. This is the first direct observation of octahedrally coordinated Mo(VI) adsorption species on hematite, and this information has broad implications for the mobility and transport of Mo as a contaminant in the environment.
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Affiliation(s)
- Jing Zhang
- Williamson Research Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK
| | - Victoria S Coker
- Williamson Research Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK
| | - J Frederick W Mosselmans
- Diamond Light Source Ltd., Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK
| | - Samuel Shaw
- Williamson Research Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK.
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ThomasArrigo LK, Notini L, Shuster J, Nydegger T, Vontobel S, Fischer S, Kappler A, Kretzschmar R. Mineral characterization and composition of Fe-rich flocs from wetlands of Iceland: Implications for Fe, C and trace element export. Sci Total Environ 2022; 816:151567. [PMID: 34762956 DOI: 10.1016/j.scitotenv.2021.151567] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Revised: 11/05/2021] [Accepted: 11/05/2021] [Indexed: 05/26/2023]
Abstract
In freshwater wetlands, redox interfaces characterized by circumneutral pH, steep gradients in O2, and a continual supply of Fe(II) form ecological niches favorable to microaerophilic iron(II) oxidizing bacteria (FeOB) and the formation of flocs; associations of (a)biotic mineral phases, microorganisms, and (microbially-derived) organic matter. On the volcanic island of Iceland, wetlands are replenished with Fe-rich surface-, ground- and springwater. Combined with extensive drainage of lowland wetlands, which forms artificial redox gradients, accumulations of bright orange (a)biotically-derived Fe-rich flocs are common features of Icelandic wetlands. These loosely consolidated flocs are easily mobilized, and, considering the proximity of Iceland's lowland wetlands to the coast, are likely to contribute to the suspended sediment load transported to coastal waters. To date, however, little is known regarding (Fe) mineral and elemental composition of the flocs. In this study, flocs from wetlands (n = 16) across Iceland were analyzed using X-ray diffraction and spectroscopic techniques (X-ray absorption and 57Fe Mössbauer) combined with chemical extractions and (electron) microscopy to comprehensively characterize floc mineral, elemental, and structural composition. All flocs were rich in Fe (229-414 mg/g), and floc Fe minerals comprised primarily ferrihydrite and nano-crystalline lepidocrocite, with a single floc sample containing nano-crystalline goethite. Floc mineralogy also included Fe in clay minerals and appreciable poorly-crystalline aluminosilicates, most likely allophane and/or imogolite. Microscopy images revealed that floc (bio)organics largely comprised mineral encrusted microbially-derived components (i.e. sheaths, stalks, and EPS) indicative of common FeOB Leptothrix spp. and Gallionella spp. Trace element contents in the flocs were in the low μg/g range, however nearly all trace elements were extracted with hydroxylamine hydrochloride. This finding suggests that the (a)biotic reductive dissolution of floc Fe minerals, plausibly driven by exposure to the varied geochemical conditions of coastal waters following floc mobilization, could lead to the release of associated trace elements. Thus, the flocs should be considered vectors for transport of Fe, organic carbon, and trace elements from Icelandic wetlands to coastal waters.
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Affiliation(s)
- Laurel K ThomasArrigo
- Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, ETH Zurich, Universitätstrasse 16, CHN, CH-8092 Zürich, Switzerland.
| | - Luiza Notini
- Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, ETH Zurich, Universitätstrasse 16, CHN, CH-8092 Zürich, Switzerland
| | - Jeremiah Shuster
- Tübingen Structural Microscopy Core Facility, Centre for Applied Geosciences (ZAG), University of Tübingen, Schnarrenbergstrasse 94-96, D-72076 Tübingen, Germany
| | - Tabea Nydegger
- Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, ETH Zurich, Universitätstrasse 16, CHN, CH-8092 Zürich, Switzerland
| | - Sophie Vontobel
- Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, ETH Zurich, Universitätstrasse 16, CHN, CH-8092 Zürich, Switzerland
| | - Stefan Fischer
- Tübingen Structural Microscopy Core Facility, Centre for Applied Geosciences (ZAG), University of Tübingen, Schnarrenbergstrasse 94-96, D-72076 Tübingen, Germany
| | - Andreas Kappler
- Geomicrobiology Group, Centre for Applied Geosciences (ZAG), University of Tübingen, Schnarrenbergstrasse 94-96, D-72076 Tübingen, Germany
| | - Ruben Kretzschmar
- Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, ETH Zurich, Universitätstrasse 16, CHN, CH-8092 Zürich, Switzerland
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Zhou H, Liu H, Lai Q, Lei Z, Song S, He K, Liu C, Chen Y, Hu Y. Electro-activating non-radical 1O 2/H* via single atom manganese modified cathode: The indispensable role of metal active site Mn. J Hazard Mater 2022; 426:127794. [PMID: 34810007 DOI: 10.1016/j.jhazmat.2021.127794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 11/09/2021] [Accepted: 11/11/2021] [Indexed: 06/13/2023]
Abstract
As an alternative to noble-metal Pt based catalysts, metal-based single atomic catalytic (SACs) exhibited excellent atom efficiency and catalytic activity via exposing abundant single atomic active centers. Here, we synthesized the monatomic Mn ligands anchored on porous N, P, S- co-doped carbon framework (Mn content over 4.5 wt%) (denoted as Mn-SAC@PZS). The single atomic Mn exhibited super mass activity (11.58 m2 g-1) and kinetic current (1.122×103 µA) with a much lower Tafel slope (4.25 mV dec-1) at 0.792 V (vs. SCE). XANES and EXAFS revealed that the mononuclear Mn were inclined to coordinate with N and S rather than P to form the R space of Mn, in which the first coordination shells backscattered with Mn-N and Mn-S. RRDE revealed that one-electron ORR pathway (72 ~ 100%) dominated at the potential of 0.5 ~ 0.7 V, oxygen molecule was absorbed/activated on site Mn* to form O* intermediate, then further activated to 1O2 via one-electron ORR pathway, while H* was electro activated by non-metallic active sites (i.e. pyri-N, sp-N, -PN and SO). In addition, the Mn-SAC@PZS was capable of highly selectively capturing and effectively degrading CIP in the presence of HA. Fast and complete removal of CIP was achieved within 30 min in the Mn-SAC@PZS-EFLP system, and the apparent rate constant (k) was up to 0.25 min-1. The energy consumption value was 0.453 kWh m-3, much lower than non-single atomic catalyst MnxOy@PZS (0.655 kWh m-3), which was comparable with the state-of-the-art advanced oxidation processes. These findings provided new insights into the maximum release of the atomic activity of the catalyst, and provides a possible way to selectively remove aromatics from multiple pollutants in complex water system.
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Affiliation(s)
- Huajing Zhou
- Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Huimin Liu
- Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Quanguang Lai
- Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Ziyu Lei
- Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Song Song
- Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Kuang He
- South China Institute of Environmental Sciences, MEE, Guangzhou, Guangdong 510006, China
| | - Chang Liu
- South China Institute of Environmental Sciences, MEE, Guangzhou, Guangdong 510006, China
| | - Yuancai Chen
- Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
| | - Yongyou Hu
- Ministry of Education Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area, College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
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