1
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Long C, Wan K, Chen Y, Li L, Jiang Y, Yang C, Wu Q, Wu G, Xu P, Li J, Shi X, Tang Z, Cui C. Steering the Reconstruction of Oxide-Derived Cu by Secondary Metal for Electrosynthesis of n-Propanol from CO. J Am Chem Soc 2024; 146:4632-4641. [PMID: 38340061 DOI: 10.1021/jacs.3c11359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2024]
Abstract
As fuel and an important chemical feedstock, n-propanol is highly desired in electrochemical CO2/CO reduction on Cu catalysts. However, the precise regulation of the Cu localized structure is still challenging and poorly understood, thus hindering the selective n-propanol electrosynthesis. Herein, by decorating Au nanoparticles (NPs) on CuO nanosheets (NSs), we present a counterintuitive transformation of CuO into undercoordinated Cu sites locally around Au NPs during CO reduction. In situ spectroscopic techniques reveal the Au-steered formation of abundant undercoordinated Cu sites during the removal of oxygen on CuO. First-principles accuracy molecular dynamic simulation demonstrates that the localized Cu atoms around Au tend to rearrange into disordered layer rather than a Cu (111) close-packed plane observed on bare CuO NSs. These Au-steered undercoordinated Cu sites facilitate CO binding, enabling selective electroreduction of CO into n-propanol with a high Faradaic efficiency of 48% in a flow cell. This work provides new insight into the regulation of the oxide-derived catalysts reconstruction with a secondary metal component.
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Affiliation(s)
- Chang Long
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
| | - Kaiwei Wan
- Laboratory of Theoretical and Computational Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yu Chen
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, P. R. China
| | - Lei Li
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
| | - Yuheng Jiang
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Caoyu Yang
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Qianbao Wu
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
| | - Guoling Wu
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Peng Xu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Jiong Li
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, P. R. China
| | - Xinghua Shi
- Laboratory of Theoretical and Computational Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Zhiyong Tang
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Chunhua Cui
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
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2
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Idhil Ismail A, Musyarofah, Haliq R. Influence of Cr-content on the local atomic structure of Fe–Cr alloy, a study using EXAFS. Radiat Phys Chem Oxf Engl 1993 2023. [DOI: 10.1016/j.radphyschem.2023.110869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
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3
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Hilpmann S, Rossberg A, Steudtner R, Drobot B, Hübner R, Bok F, Prieur D, Bauters S, Kvashnina KO, Stumpf T, Cherkouk A. Presence of uranium(V) during uranium(VI) reduction by Desulfosporosinus hippei DSM 8344 T. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 875:162593. [PMID: 36889400 DOI: 10.1016/j.scitotenv.2023.162593] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 02/27/2023] [Accepted: 02/27/2023] [Indexed: 06/18/2023]
Abstract
Microbial U(VI) reduction influences uranium mobility in contaminated subsurface environments and can affect the disposal of high-level radioactive waste by transforming the water-soluble U(VI) to less mobile U(IV). The reduction of U(VI) by the sulfate-reducing bacterium Desulfosporosinus hippei DSM 8344T, a close phylogenetic relative to naturally occurring microorganism present in clay rock and bentonite, was investigated. D. hippei DSM 8344T showed a relatively fast removal of uranium from the supernatants in artificial Opalinus Clay pore water, but no removal in 30 mM bicarbonate solution. Combined speciation calculations and luminescence spectroscopic investigations showed the dependence of U(VI) reduction on the initial U(VI) species. Scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy showed uranium-containing aggregates on the cell surface and some membrane vesicles. By combining different spectroscopic techniques, including UV/Vis spectroscopy, as well as uranium M4-edge X-ray absorption near-edge structure recorded in high-energy-resolution fluorescence-detection mode and extended X-ray absorption fine structure analysis, the partial reduction of U(VI) could be verified, whereby the formed U(IV) product has an unknown structure. Furthermore, the U M4 HERFD-XANES showed the presence of U(V) during the process. These findings offer new insights into U(VI) reduction by sulfate-reducing bacteria and contribute to a comprehensive safety concept for a repository for high-level radioactive waste.
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Affiliation(s)
- Stephan Hilpmann
- 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; Rossendorf Beamline (BM20-ROBL), European Synchrotron Radiation Facility, Grenoble, France
| | - Robin Steudtner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Björn Drobot
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - René Hübner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany
| | - Frank Bok
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Damien Prieur
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany; Rossendorf Beamline (BM20-ROBL), European Synchrotron Radiation Facility, Grenoble, France
| | - Stephen Bauters
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany; Rossendorf Beamline (BM20-ROBL), European Synchrotron Radiation Facility, Grenoble, France
| | - Kristina O Kvashnina
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany; Rossendorf Beamline (BM20-ROBL), European Synchrotron Radiation Facility, Grenoble, France
| | - Thorsten Stumpf
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Andrea Cherkouk
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany.
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4
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Sarma BB, Maurer F, Doronkin DE, Grunwaldt JD. Design of Single-Atom Catalysts and Tracking Their Fate Using Operando and Advanced X-ray Spectroscopic Tools. Chem Rev 2022; 123:379-444. [PMID: 36418229 PMCID: PMC9837826 DOI: 10.1021/acs.chemrev.2c00495] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The potential of operando X-ray techniques for following the structure, fate, and active site of single-atom catalysts (SACs) is highlighted with emphasis on a synergetic approach of both topics. X-ray absorption spectroscopy (XAS) and related X-ray techniques have become fascinating tools to characterize solids and they can be applied to almost all the transition metals deriving information about the symmetry, oxidation state, local coordination, and many more structural and electronic properties. SACs, a newly coined concept, recently gained much attention in the field of heterogeneous catalysis. In this way, one can achieve a minimum use of the metal, theoretically highest efficiency, and the design of only one active site-so-called single site catalysts. While single sites are not easy to characterize especially under operating conditions, XAS as local probe together with complementary methods (infrared spectroscopy, electron microscopy) is ideal in this research area to prove the structure of these sites and the dynamic changes during reaction. In this review, starting from their fundamentals, various techniques related to conventional XAS and X-ray photon in/out techniques applied to single sites are discussed with detailed mechanistic and in situ/operando studies. We systematically summarize the design strategies of SACs and outline their exploration with XAS supported by density functional theory (DFT) calculations and recent machine learning tools.
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Affiliation(s)
- Bidyut Bikash Sarma
- Institute
for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstraße 20, 76131 Karlsruhe, Germany,Institute
of Catalysis Research and Technology, Karlsruhe
Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen, 76344 Karlsruhe, Germany,
| | - Florian Maurer
- Institute
for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstraße 20, 76131 Karlsruhe, Germany
| | - Dmitry E. Doronkin
- Institute
for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstraße 20, 76131 Karlsruhe, Germany,Institute
of Catalysis Research and Technology, Karlsruhe
Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen, 76344 Karlsruhe, Germany
| | - Jan-Dierk Grunwaldt
- Institute
for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstraße 20, 76131 Karlsruhe, Germany,Institute
of Catalysis Research and Technology, Karlsruhe
Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen, 76344 Karlsruhe, Germany,
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5
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Evaluation of 134Ce as a PET imaging surrogate for antibody drug conjugates incorporating 225Ac. Nucl Med Biol 2022; 110-111:28-36. [DOI: 10.1016/j.nucmedbio.2022.04.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 04/08/2022] [Accepted: 04/12/2022] [Indexed: 12/19/2022]
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6
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Carter KP, Wacker JN, Smith KF, Deblonde GJP, Moreau LM, Rees JA, Booth CH, Abergel RJ. In situ beam reduction of Pu(IV) and Bk(IV) as a route to trivalent transuranic coordination complexes with hydroxypyridinone chelators. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:315-322. [PMID: 35254293 PMCID: PMC8900832 DOI: 10.1107/s1600577522000200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 01/06/2022] [Indexed: 06/14/2023]
Abstract
The solution-state interactions of plutonium and berkelium with the octadentate chelator 3,4,3-LI(1,2-HOPO) (343-HOPO) were investigated and characterized by X-ray absorption spectroscopy, which revealed in situ reductive decomposition of the tetravalent species of both actinide metals to yield Pu(III) and Bk(III) coordination complexes. X-ray absorption near-edge structure (XANES) measurements were the first indication of in situ synchrotron redox chemistry as the Pu threshold and white-line position energies for Pu-343-HOPO were in good agreement with known diagnostic Pu(III) species, whereas Bk-343-HOPO results were found to mirror the XANES behavior of Bk(III)-DTPA. Extended X-ray absorption fine structure results revealed An-OHOPO bond distances of 2.498 (5) and 2.415 (2) Å for Pu and Bk, respectively, which match well with bond distances obtained for trivalent actinides and 343-HOPO via density functional theory calculations. Pu(III)- and Bk(III)-343-HOPO data also provide initial insight into actinide periodicity as they can be compared with previous results with Am(III)-, Cm(III)-, Cf(III)-, and Es(III)-343-HOPO, which indicate there is likely an increase in 5f covalency and heterogeneity across the actinide series.
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Affiliation(s)
- Korey P. Carter
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Jennifer N. Wacker
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Kurt F. Smith
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | | | - Liane M. Moreau
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Julian A. Rees
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Corwin H. Booth
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Rebecca J. Abergel
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Department of Nuclear Engineering, University of California, Berkeley, CA 94720, USA
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7
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Bessen NP, Popov IA, Heathman CR, Grimes TS, Zalupski PR, Moreau LM, Smith KF, Booth CH, Abergel RJ, Batista ER, Yang P, Shafer JC. Complexation of Lanthanides and Heavy Actinides with Aqueous Sulfur-Donating Ligands. Inorg Chem 2021; 60:6125-6134. [PMID: 33866779 DOI: 10.1021/acs.inorgchem.1c00257] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The separation of trivalent lanthanides and actinides is challenging because of their similar sizes and charge densities. S-donating extractants have shown significant selectivity for trivalent actinides over lanthanides, with single-stage americium/lanthanide separation efficiencies for some thiol-based extractants reported at >99.999%. While such separations could transform the nuclear waste management landscape, these systems are often limited by the hydrolytic and radiolytic stability of the extractant. Progress away from thiol-based systems is limited by the poorly understood and complex interactions of these extractants in organic phases, where molecular aggregation and micelle formation obfuscates assessment of the metal-extractant coordination environment. Because S-donating thioethers are generally more resistant to hydrolysis and oxidation and the aqueous phase coordination chemistry is anticipated to lack complications brought on by micelle formation, we have considered three thioethers, 2,2'-thiodiacetic acid (TDA), (2R,5S)-tetrahydrothiophene-2,5-dicarboxylic acid, and 2,5-thiophenedicarboxylic acid (TPA), as possible trivalent actinide selective reagents. Formation constants, extended X-ray absorption fine structure spectroscopy, and computational studies were completed for thioether complexes with a variety of trivalent lanthanides and actinides including Nd, Eu, Tb, Am, Cm, Bk, and Cf. TPA was found to have moderately higher selectivity for the actinides because of its ability to bind actinides in a different manner than lanthanides, but the utility of TPA is limited by poor water solubility and high rigidity. While significant competition with water for the metal center limits the efficacy of aqueous-based thioethers for separations, the characterization of these solution-phase, S-containing lanthanide and actinide complexes is the most comprehensively available in the literature to date. This is due to the breadth of lanthanides and actinides considered as well as the techniques deployed and serves as a platform for the further development of S-containing reagents for actinide separations. Additionally, this paper reports on the first bond lengths for Cf and Bk with a neutral S donor.
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Affiliation(s)
- Nathan P Bessen
- Colorado School of Mines, 1500 Illinois Street, Golden, Colorado 80401, United States
| | - Ivan A Popov
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Colt R Heathman
- Idaho National Laboratory, 2525 Fremont Avenue, Idaho Falls, Idaho 83402, United States
| | - Travis S Grimes
- Idaho National Laboratory, 2525 Fremont Avenue, Idaho Falls, Idaho 83402, United States
| | - Peter R Zalupski
- Idaho National Laboratory, 2525 Fremont Avenue, Idaho Falls, Idaho 83402, United States
| | - Liane M Moreau
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Kurt F Smith
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Corwin H Booth
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Rebecca J Abergel
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Enrique R Batista
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Ping Yang
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Jenifer C Shafer
- Colorado School of Mines, 1500 Illinois Street, Golden, Colorado 80401, United States
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8
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Zhang J, Wenzel M, Schnaars K, Hennersdorf F, Schwedtmann K, März J, Rossberg A, Kaden P, Kraus F, Stumpf T, Weigand JJ. Coordination of trivalent lanthanum and cerium, and tetravalent cerium and actinides (An = Th(IV), U(IV), Np(IV)) by a 4-phosphoryl 1 H-pyrazol-5-olate ligand in solution and the solid state. Dalton Trans 2021; 50:3550-3558. [PMID: 33605972 DOI: 10.1039/d1dt00365h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Structural investigations of three actinide(iv) 4-phosphoryl 1H-pyrazol-5-olate complexes (An = Th(iv), U(iv), Np(iv)) and their cerium(iv) analogue display the same metal coordination in the solid state. The mononuclear complexes show the metal centre in a square antiprismatic coordination geometry composed by the two O-donor atoms of four deprotonated ligands. Detailed solid state analysis of the U(iv) complex shows that dependent on the solvent used altered arrangements are observable, resulting in a change in the coordination polyhedron of the U(iv) metal centre to bi-capped trigonal prismatic. Further, single crystal analyses of the La(iii) and Ce(iii) complexes show that the ligand can also act as a neutral ligand by protonation of the pyrazolyl moiety. All complexes were comprehensively characterized by NMR, IR and Raman spectroscopy. A single resonance in each of the 31P NMR spectra for the La(iii), Ce(iii), Ce(iv), Th(iv) and Np(iv) complex indicates the formation of highly symmetric complex species in solution. Extended X-ray absorption fine structure (EXAFS) investigations provide evidence for the same local structure of the U(iv) and Np(iv) complex in toluene solution, confirming the observations made in the solid state.
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Affiliation(s)
- Jianfeng Zhang
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany.
| | - Marco Wenzel
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany.
| | - Kathleen Schnaars
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany.
| | - Felix Hennersdorf
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany.
| | - Kai Schwedtmann
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany.
| | - Juliane März
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, 01328 Dresden, Germany
| | - André Rossberg
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, 01328 Dresden, Germany and The Rossendorf Beamline at ESRF, 38043 Grenoble, France
| | - Peter Kaden
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Florian Kraus
- Department of Chemistry, Philipps-Universität Marburg, 35032 Marburg, Germany
| | - Thorsten Stumpf
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Jan J Weigand
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany.
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9
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Carter KP, Shield KM, Smith KF, Jones ZR, Wacker JN, Arnedo-Sanchez L, Mattox TM, Moreau LM, Knope KE, Kozimor SA, Booth CH, Abergel RJ. Structural and spectroscopic characterization of an einsteinium complex. Nature 2021; 590:85-88. [PMID: 33536647 DOI: 10.1038/s41586-020-03179-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Accepted: 10/29/2020] [Indexed: 02/06/2023]
Abstract
The transplutonium elements (atomic numbers 95-103) are a group of metals that lie at the edge of the periodic table. As a result, the patterns and trends used to predict and control the physics and chemistry for transition metals, main-group elements and lanthanides are less applicable to transplutonium elements. Furthermore, understanding the properties of these heavy elements has been restricted by their scarcity and radioactivity. This is especially true for einsteinium (Es), the heaviest element on the periodic table that can currently be generated in quantities sufficient to enable classical macroscale studies1. Here we characterize a coordination complex of einsteinium, using less than 200 nanograms of 254Es (with half-life of 275.7(5) days), with an organic hydroxypyridinone-based chelating ligand. X-ray absorption spectroscopic and structural studies are used to determine the energy of the L3-edge and a bond distance of einsteinium. Photophysical measurements show antenna sensitization of EsIII luminescence; they also reveal a hypsochromic shift on metal complexation, which had not previously been observed in lower-atomic-number actinide elements. These findings are indicative of an intermediate spin-orbit coupling scheme in which j-j coupling (whereby single-electron orbital angular momentum and spin are first coupled to form a total angular momentum, j) prevails over Russell-Saunders coupling. Together with previous actinide complexation studies2, our results highlight the need to continue studying the unusual behaviour of the actinide elements, especially those that are scarce and short-lived.
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Affiliation(s)
- Korey P Carter
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Katherine M Shield
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.,Department of Nuclear Engineering, University of California, Berkeley, CA, USA
| | - Kurt F Smith
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | | | - Jennifer N Wacker
- Los Alamos National Laboratory, Los Alamos, NM, USA.,Department of Chemistry, Georgetown University, Washington, DC, USA
| | | | - Tracy M Mattox
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Liane M Moreau
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Karah E Knope
- Department of Chemistry, Georgetown University, Washington, DC, USA
| | | | - Corwin H Booth
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
| | - Rebecca J Abergel
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA. .,Department of Nuclear Engineering, University of California, Berkeley, CA, USA.
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10
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Tabatabaei K, Sully HR, Ju Z, Hellier K, Lu H, Perez CJ, Newton KA, Brutchey RL, Bridges F, Carter SA, Kauzlarich SM. Structural Insights on Microwave-Synthesized Antimony-Doped Germanium Nanocrystals. ACS NANO 2021; 15:1685-1700. [PMID: 33434437 DOI: 10.1021/acsnano.0c09352] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Doped and alloyed germanium nanocrystals (Ge NCs) are potential candidates for a variety of applications such as photovoltaics and near IR detectors. Recently, bismuth (Bi) as an n-type group 15 element was shown to be successfully and kinetically doped into Ge NCs through a microwave-assisted solution-based synthesis, although Bi is thermodynamically insoluble in bulk crystalline Ge. To expand the composition manipulation of Ge NCs, another more common n-type group 15 element for semiconductors, antimony (Sb), is investigated. Oleylamine (OAm)- and OAm/trioctylphosphine (TOP)-capped Sb-doped Ge NCs have been synthesized by the microwave-assisted solution reaction of GeI2 with SbI3. Passivating the Ge surface with a binary ligand system of OAm/TOP results in formation of consistently larger NCs compared to OAm alone. The TOP coordination on the Ge surface is confirmed by 31P NMR and SEM-EDS. The lattice parameter of Ge NCs increases with increasing Sb concentration (0.00-2.0 mol %), consistent with incorporation of Sb. An increase in the NC diameter with higher content of SbI3 in the reaction is shown by TEM. XPS and EDS confirm the presence of Sb before and after removal of surface ligands with hydrazine and recapping the Ge NC surface with dodecanethiol (DDT). EXAFS analysis suggests that Sb resides within the NCs on highly distorted sites next to a Ge vacancy as well as on the crystallite surface. High Urbach energies obtained from photothermal deflection spectroscopy (PDS) of the films prepared from pristine Ge NC and Sb-doped Ge NCs indicate high levels of disorder, in agreement with EXAFS data. Electrical measurements on TiO2-NC electron- and hole-only devices show an increase in hole conduction, suggesting that the Sb-vacancy defects are behaving as a p-type dopant in the Ge NCs, consistent with the vacancy model derived from the EXAFS results.
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Affiliation(s)
- Katayoon Tabatabaei
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Heather R Sully
- Department of Electrical Engineering, University of California, Santa Cruz, California 95064, United States
| | - Zheng Ju
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Kaitlin Hellier
- Department of Physics, University of California, Santa Cruz, California 95064, United States
| | - Haipeng Lu
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Christopher J Perez
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Kathryn A Newton
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Richard L Brutchey
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Frank Bridges
- Department of Physics, University of California, Santa Cruz, California 95064, United States
| | - Sue A Carter
- Department of Physics, University of California, Santa Cruz, California 95064, United States
| | - Susan M Kauzlarich
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
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11
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Tsounis C, Lu X, Bedford NM, Subhash B, Thomsen L, Zhang Q, Ma Z, Ostrikov KK, Bendavid A, Scott JA, Amal R, Han Z. Valence Alignment of Mixed Ni-Fe Hydroxide Electrocatalysts through Preferential Templating on Graphene Edges for Enhanced Oxygen Evolution. ACS NANO 2020; 14:11327-11340. [PMID: 32790322 DOI: 10.1021/acsnano.0c03380] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Engineering the metal-carbon heterointerface has become an increasingly important route toward achieving cost-effective and high-performing electrocatalysts. The specific properties of graphene edge sites, such as the high available density of states and extended unpaired π-bonding, make it a promising candidate to tune the electronic properties of metal catalysts. However, to date, understanding and leveraging graphene edge-metal catalysts for improved electrocatalytic performance remains largely elusive. Herein, edge-rich vertical graphene (er-VG) was synthesized and used as a catalyst support for Ni-Fe hydroxides for the oxygen evolution reaction (OER). The hybrid Ni-Fe/er-VG catalyst exhibits excellent OER performance with a mass current of 4051 A g-1 (at overpotential η = 300 mV) and turnover frequency (TOF) of 4.8 s-1 (η = 400 mV), outperforming Ni-Fe deposited on pristine VG and other metal foam supports. Angle-dependent X-ray absorption spectroscopy shows that the edge-rich VG support can preferentially template Fe-O units with a specific valence orbital alignment interacting with the unoccupied density of states on the graphene edges. This graphene edge-metal interaction was shown to facilitate the formation of undersaturated and strained Fe-sites with high valence states, while promoting the formation of redox-activated Ni species, thus improving OER performance. These findings demonstrate rational design of the graphene edge-metal interface in electrocatalysts which can be used for various energy conversion and chemical synthesis reactions.
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Affiliation(s)
- Constantine Tsounis
- School of Chemical Engineering, The University of New South Wales, Kensington, New South Wales 2052, Australia
| | - Xunyu Lu
- School of Chemical Engineering, The University of New South Wales, Kensington, New South Wales 2052, Australia
| | - Nicholas M Bedford
- School of Chemical Engineering, The University of New South Wales, Kensington, New South Wales 2052, Australia
| | - Bijil Subhash
- School of Chemical Engineering, The University of New South Wales, Kensington, New South Wales 2052, Australia
| | - Lars Thomsen
- Australian Synchrotron, ANSTO, 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Qingran Zhang
- School of Chemical Engineering, The University of New South Wales, Kensington, New South Wales 2052, Australia
| | - Zhipeng Ma
- School of Chemical Engineering, The University of New South Wales, Kensington, New South Wales 2052, Australia
| | - Kostya Ken Ostrikov
- School of Chemistry and Physics, and Centre for Materials Science, Queensland University of Technology, Brisbane, Queensland 4000, Australia
- CSIRO Manufacturing, 36 Bradfield Road, Lindfield, New South Wales 2070, Australia
| | - Avi Bendavid
- CSIRO Manufacturing, 36 Bradfield Road, Lindfield, New South Wales 2070, Australia
- School of Materials Science and Engineering, The University of New South Wales, Kensington, New South Wales 2052, Australia
| | - Jason A Scott
- School of Chemical Engineering, The University of New South Wales, Kensington, New South Wales 2052, Australia
| | - Rose Amal
- School of Chemical Engineering, The University of New South Wales, Kensington, New South Wales 2052, Australia
| | - Zhaojun Han
- School of Chemical Engineering, The University of New South Wales, Kensington, New South Wales 2052, Australia
- CSIRO Manufacturing, 36 Bradfield Road, Lindfield, New South Wales 2070, Australia
- School of Mechanical and Manufacturing Engineering, The University of New South Wales, Kensington, New South Wales 2052, Australia
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12
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Das P, Klug JA, Sinclair N, Wang X, Toyoda Y, Li Y, Williams B, Schuman A, Zhang J, Turneaure SJ. Single-pulse (100 ps) extended x-ray absorption fine structure capability at the Dynamic Compression Sector. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:085115. [PMID: 32872941 DOI: 10.1063/5.0003427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Accepted: 08/02/2020] [Indexed: 06/11/2023]
Abstract
Determining real-time changes in the local atomistic order is important for a mechanistic understanding of shock wave induced structural and chemical changes. However, the single event and short duration (nanosecond times) nature of shock experiments pose challenges in obtaining Extended X-ray Absorption Fine Structure (EXAFS) measurements-typically used for monitoring local order changes. Here, we report on a new single pulse (∼100 ps duration) transmission geometry EXAFS capability for use in laser shock-compression experiments at the Dynamic Compression Sector (DCS), Advanced Photon Source. We used a flat plate of highly oriented pyrolytic graphite (HOPG) as the spectrometer element to energy disperse x rays transmitted through the sample. It provided high efficiency with ∼15% of the x rays incident on the HOPG reaching an x-ray area detector with high quantum efficiency. This combination resulted in a good signal-to-noise ratio (∼103), an energy resolution of ∼10 eV at 10 keV, EXAFS spectra covering 100 s of eV, and a good pulse to pulse reproducibility of our single pulse measurements. Ambient EXAFS spectra for Cu and Au are compared to the reference spectra, validating our measurement system. Comparison of single pulse EXAFS results for ambient and laser shocked Ge(100) shows large changes in the local structure of the short lived state of shocked Ge. The current DCS EXAFS capability can be used to perform single pulse measurements in laser shocked materials from ∼9 keV to 13 keV. These EXAFS developments will be available to all users of the DCS.
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Affiliation(s)
- Pinaki Das
- Dynamic Compression Sector, Institute for Shock Physics, Washington State University, Argonne, Illinois 60439, USA
| | - Jeffrey A Klug
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Nicholas Sinclair
- Dynamic Compression Sector, Institute for Shock Physics, Washington State University, Argonne, Illinois 60439, USA
| | - Xiaoming Wang
- Dynamic Compression Sector, Institute for Shock Physics, Washington State University, Argonne, Illinois 60439, USA
| | - Yoshimasa Toyoda
- Institute for Shock Physics, Washington State University, Pullman, Washington 99164, USA
| | - Yuelin Li
- Dynamic Compression Sector, Institute for Shock Physics, Washington State University, Argonne, Illinois 60439, USA
| | - Brendan Williams
- Dynamic Compression Sector, Institute for Shock Physics, Washington State University, Argonne, Illinois 60439, USA
| | - Adam Schuman
- Dynamic Compression Sector, Institute for Shock Physics, Washington State University, Argonne, Illinois 60439, USA
| | - Jun Zhang
- Dynamic Compression Sector, Institute for Shock Physics, Washington State University, Argonne, Illinois 60439, USA
| | - Stefan J Turneaure
- Institute for Shock Physics, Washington State University, Pullman, Washington 99164, USA
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13
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Moreau LM, Herve A, Straub MD, Russo DR, Abergel RJ, Alayoglu S, Arnold J, Braun A, Deblonde GJP, Liu Y, Lohrey TD, Olive DT, Qiao Y, Rees JA, Shuh DK, Teat SJ, Booth CH, Minasian SG. Structural properties of ultra-small thorium and uranium dioxide nanoparticles embedded in a covalent organic framework. Chem Sci 2020; 11:4648-4668. [PMID: 34122920 PMCID: PMC8159168 DOI: 10.1039/c9sc06117g] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 04/13/2020] [Indexed: 01/23/2023] Open
Abstract
We report the structural properties of ultra-small ThO2 and UO2 nanoparticles (NPs), which were synthesized without strong binding surface ligands by employing a covalent organic framework (COF-5) as an inert template. The resultant NPs were used to observe how structural properties are affected by decreasing grain size within bulk actinide oxides, which has implications for understanding the behavior of nuclear fuel materials. Through a comprehensive characterization strategy, we gain insight regarding how structure at the NP surface differs from the interior. Characterization using electron microscopy and small-angle X-ray scattering indicates that growth of the ThO2 and UO2 NPs was confined by the pores of the COF template, resulting in sub-3 nm particles. X-ray absorption fine structure spectroscopy results indicate that the NPs are best described as ThO2 and UO2 materials with unpassivated surfaces. The surface layers of these particles compensate for high surface energy by exhibiting a broader distribution of Th-O and U-O bond distances despite retaining average bond lengths that are characteristic of bulk ThO2 and UO2. The combined synthesis and physical characterization efforts provide a detailed picture of actinide oxide structure at the nanoscale, which remains highly underexplored compared to transition metal counterparts.
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Affiliation(s)
- Liane M Moreau
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | | | - Mark D Straub
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- University of California Berkeley CA 94720 USA
| | - Dominic R Russo
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- University of California Berkeley CA 94720 USA
| | - Rebecca J Abergel
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- University of California Berkeley CA 94720 USA
| | - Selim Alayoglu
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - John Arnold
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- University of California Berkeley CA 94720 USA
| | - Augustin Braun
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | | | | | - Trevor D Lohrey
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- University of California Berkeley CA 94720 USA
| | - Daniel T Olive
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Yusen Qiao
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- University of Pennsylvania Philadelphia PA 19104 USA
| | - Julian A Rees
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - David K Shuh
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - Simon J Teat
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - Corwin H Booth
- Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
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14
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Wilkerson MP, Hernandez SC, Mullen WT, Nelson AT, Pugmire AL, Scott BL, Sooby ES, Tamasi AL, Wagner GL, Walensky JR. Hydration of α-UO3 following storage under controlled conditions of temperature and relative humidity. Dalton Trans 2020; 49:10452-10462. [DOI: 10.1039/d0dt01852j] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Experimental measurements and theoretical evaluation of changes in chemical speciation of α-UO3 using XRD, EXAFS, TGA, and DFT calculations.
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Affiliation(s)
| | | | | | | | | | | | | | - Alison L. Tamasi
- Los Alamos National Laboratory
- Los Alamos
- USA
- Department of Chemistry
- University of Missouri-Columbia
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15
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Doronkin DE, Wang S, Sharapa DI, Deschner BJ, Sheppard TL, Zimina A, Studt F, Dittmeyer R, Behrens S, Grunwaldt JD. Dynamic structural changes of supported Pd, PdSn, and PdIn nanoparticles during continuous flow high pressure direct H 2O 2 synthesis. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00553c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The structure of mono- and bimetallic supported Pd, PdSn, and PdIn NPs was monitored with a combination of techniques during continuous H2O2 synthesis with H2O2 production rates up to 580 mmolH2O2 gcat−1 h−1.
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16
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Ansari TN, Taussat A, Clark AH, Nachtegaal M, Plummer S, Gallou F, Handa S. Insights on Bimetallic Micellar Nanocatalysis for Buchwald–Hartwig Aminations. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02622] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Tharique N. Ansari
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Armand Taussat
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Adam H. Clark
- Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland
| | - Maarten Nachtegaal
- Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen, Switzerland
| | - Scott Plummer
- Novartis Institutes for Biomedical Research, 250 Massachusetts Ave, Cambridge, Massachusetts 02139, United States
| | | | - Sachin Handa
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
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17
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Philipp T, Shams Aldin Azzam S, Rossberg A, Huittinen N, Schmeide K, Stumpf T. U(VI) sorption on Ca-bentonite at (hyper)alkaline conditions - Spectroscopic investigations of retention mechanisms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 676:469-481. [PMID: 31048176 DOI: 10.1016/j.scitotenv.2019.04.274] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 03/15/2019] [Accepted: 04/18/2019] [Indexed: 06/09/2023]
Abstract
Environmental conditions in deep geological repositories for radioactive waste may involve high pH values due to the degradation of concrete. However, the U(VI) sorption at such (hyper)alkaline conditions is still poorly understood. In this study, batch sorption experiments with Ca-bentonite in the pH range 8-13 at different carbonate concentrations were combined with spectroscopic investigations in order to gain insight into the underlying retention mechanisms. It was found that U(VI) sorption strongly correlates with the aqueous U(VI) speciation determined by time-resolved laser-induced luminescence spectroscopy (TRLFS). Increasing retention with increasing pH was accompanied by a change in aqueous speciation from uranyl carbonates to uranyl hydroxides. The occurrence of luminescence line-narrowing and a decreased frequency of the symmetric stretch vibration, deduced from site-selective TRLFS, indicate the presence of adsorbed U(VI) surface complexes. X-ray absorption fine structure (EXAFS) spectroscopy confirms that surface precipitation does not contribute significantly to the removal of U(VI) from solution but that retention occurs through the formation of two non-equivalent U(VI)-complexes on the bentonite surface. The present study demonstrates that in alkaline environments, where often only precipitation processes are considered, adsorption can provide effective retention of U(VI), despite the anionic character of prevailing aqueous species.
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Affiliation(s)
- Thimo Philipp
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany.
| | - Salim Shams Aldin Azzam
- 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 at ESRF, F-38043 Grenoble, France.
| | - Nina Huittinen
- Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany.
| | - Katja Schmeide
- 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.
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18
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Gong Q, Ding P, Xu M, Zhu X, Wang M, Deng J, Ma Q, Han N, Zhu Y, Lu J, Feng Z, Li Y, Zhou W, Li Y. Structural defects on converted bismuth oxide nanotubes enable highly active electrocatalysis of carbon dioxide reduction. Nat Commun 2019; 10:2807. [PMID: 31243275 PMCID: PMC6594929 DOI: 10.1038/s41467-019-10819-4] [Citation(s) in RCA: 219] [Impact Index Per Article: 43.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 06/04/2019] [Indexed: 01/06/2023] Open
Abstract
Formic acid (or formate) is suggested to be one of the most economically viable products from electrochemical carbon dioxide reduction. However, its commercial viability hinges on the development of highly active and selective electrocatalysts. Here we report that structural defects have a profound positive impact on the electrocatalytic performance of bismuth. Bismuth oxide double-walled nanotubes with fragmented surface are prepared as a template, and are cathodically converted to defective bismuth nanotubes. This converted electrocatalyst enables carbon dioxide reduction to formate with excellent activity, selectivity and stability. Most significantly, its current density reaches ~288 mA cm−2 at −0.61 V versus reversible hydrogen electrode within a flow cell reactor under ambient conditions. Using density functional theory calculations, the excellent activity and selectivity are rationalized as the outcome of abundant defective bismuth sites that stabilize the *OCHO intermediate. Furthermore, this electrocatalyst is coupled with silicon photocathodes and achieves high-performance photoelectrochemical carbon dioxide reduction. Carbon dioxide can be electrochemically reduced to form valuable chemical feedstocks, but efficiency of electrocatalysts should be improved. Here the authors report nanotube-derived bismuth for electrocatalytic reduction of carbon dioxide to formate, with performance that is enhanced by defects.
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Affiliation(s)
- Qiufang Gong
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
| | - Pan Ding
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
| | - Mingquan Xu
- School of Physical Sciences and CAS Key Laboratory of Vacuum Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiaorong Zhu
- College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
| | - Maoyu Wang
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR, 97331, USA
| | - Jun Deng
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
| | - Qing Ma
- DND-CAT, Synchrotron Research Center, Northwestern University, Evanston, IL, 60208, USA
| | - Na Han
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China
| | - Yong Zhu
- School of Physical Sciences and CAS Key Laboratory of Vacuum Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jun Lu
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL60439, USA
| | - Zhenxing Feng
- School of Chemical, Biological, and Environmental Engineering, Oregon State University, Corvallis, OR, 97331, USA.
| | - Yafei Li
- College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China.
| | - Wu Zhou
- School of Physical Sciences and CAS Key Laboratory of Vacuum Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Yanguang Li
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123, China.
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19
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Fang CY, Zhang S, Hu Y, Vasiliu M, Perez-Aguilar JE, Conley ET, Dixon DA, Chen CY, Gates BC. Reversible Metal Aggregation and Redispersion Driven by the Catalytic Water Gas Shift Half-Reactions: Interconversion of Single-Site Rhodium Complexes and Tetrarhodium Clusters in Zeolite HY. ACS Catal 2019. [DOI: 10.1021/acscatal.8b04798] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chia-Yu Fang
- Department of Chemical Engineering, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
- Department of Materials Science and Engineering, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Shengjie Zhang
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Yiqin Hu
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Monica Vasiliu
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Jorge E. Perez-Aguilar
- Department of Chemical Engineering, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Edward T. Conley
- Department of Materials Science and Engineering, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - David A. Dixon
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Cong-Yan Chen
- Department of Chemical Engineering, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
- Chevron Energy Technology Company, 100 Chevron Way, Richmond, California 94892, United States
| | - Bruce C. Gates
- Department of Chemical Engineering, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
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20
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Jahrman EP, Holden WM, Ditter AS, Mortensen DR, Seidler GT, Fister TT, Kozimor SA, Piper LFJ, Rana J, Hyatt NC, Stennett MC. An improved laboratory-based x-ray absorption fine structure and x-ray emission spectrometer for analytical applications in materials chemistry research. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:024106. [PMID: 30831699 DOI: 10.1063/1.5049383] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 02/01/2019] [Indexed: 06/09/2023]
Abstract
X-ray absorption fine structure (XAFS) and x-ray emission spectroscopy (XES) are advanced x-ray spectroscopies that impact a wide range of disciplines. However, unlike the majority of other spectroscopic methods, XAFS and XES are accompanied by an unusual access model, wherein the dominant use of the technique is for premier research studies at world-class facilities, i.e., synchrotron x-ray light sources. In this paper, we report the design and performance of an improved XAFS and XES spectrometer based on the general conceptual design of Seidler et al. [Rev. Sci. Instrum. 85, 113906 (2014)]. New developments include reduced mechanical degrees of freedom, much-increased flux, and a wider Bragg angle range to enable extended x-ray absorption fine structure (EXAFS) measurement and analysis for the first time with this type of modern laboratory XAFS configuration. This instrument enables a new class of routine applications that are incompatible with the mission and access model of the synchrotron light sources. To illustrate this, we provide numerous examples of x-ray absorption near edge structure (XANES), EXAFS, and XES results for a variety of problems and energy ranges. Highlights include XAFS and XES measurements of battery electrode materials, EXAFS of Ni with full modeling of results to validate monochromator performance, valence-to-core XES for 3d transition metal compounds, and uranium XANES and XES for different oxidation states. Taken en masse, these results further support the growing perspective that modern laboratory-based XAFS and XES have the potential to develop a new branch of analytical chemistry.
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Affiliation(s)
- Evan P Jahrman
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - William M Holden
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - Alexander S Ditter
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - Devon R Mortensen
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - Gerald T Seidler
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - Timothy T Fister
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Stosh A Kozimor
- Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Louis F J Piper
- Department of Physics, Binghamton University, Binghamton, New York 13902, USA
| | - Jatinkumar Rana
- Department of Physics, Binghamton University, Binghamton, New York 13902, USA
| | - Neil C Hyatt
- Materials Science and Engineering Department, The University of Sheffield, Mapping Street, Sheffield S1 3JD, United Kingdom
| | - Martin C Stennett
- Materials Science and Engineering Department, The University of Sheffield, Mapping Street, Sheffield S1 3JD, United Kingdom
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21
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Fröhlich DR, Koke C, Maiwald MM, Chomyn C, Plank J, Panak PJ. A spectroscopic study of the complexation reaction of trivalent lanthanides with a synthetic acrylate based PCE-superplasticizer. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 207:270-275. [PMID: 30261430 DOI: 10.1016/j.saa.2018.09.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 09/12/2018] [Accepted: 09/14/2018] [Indexed: 06/08/2023]
Abstract
The interaction between different trivalent lanthanides and a synthetic acrylate based PCE-superplasticizer (52IPEG4.5) is investigated by using a combination of laser- and synchrotron based spectroscopic techniques. Time-resolved laser fluorescence spectroscopy (TRLFS) is used to obtain thermodynamic data (stability constants (log β'(T)), reaction enthalpy (ΔrH) and entropy(ΔrS)) of the complexation reaction of Eu(III) and 52IPEG4.5 as a function of the temperature (20-80 °C) and ligand concentration (<2 g/kg) in 0.1 mol/kg NaCl solution. Under the chosen experimental conditions, the increase in temperature mainly affects the complexation properties (loading capacity) of the macromolecule itself rather than the stability constant of the formed complex (log β'(T) ranging between 6.5 and 5.9). The thermodynamic results are complemented by extended X-ray absorption fine structure (EXAFS) spectroscopic measurements to resolve the molecular structure of 52IPEG4.5 complexes with Eu(III), Gd(III), and Tb(III). The results show, that each metal ion is coordinated by three carboxylic groups within the 52IPEG4.5 complexes. Furthermore, the determined interatomic distances exhibit that the functional groups are attached in a bidentate end-on fashion.
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Affiliation(s)
- Daniel R Fröhlich
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany.
| | - Carsten Koke
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany; Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Martin M Maiwald
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany; Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Claudia Chomyn
- Technische Universität München, Lehrstuhl für Bauchemie, Lichtenbergstr. 4, 85747 Garching, Germany
| | - Johann Plank
- Technische Universität München, Lehrstuhl für Bauchemie, Lichtenbergstr. 4, 85747 Garching, Germany
| | - Petra J Panak
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany; Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany
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22
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DAFNE-Light DXR1 Soft X-Ray Synchrotron Radiation Beamline: Characteristics and XAFS Applications. CONDENSED MATTER 2019. [DOI: 10.3390/condmat4010007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
X-ray Absorption Fine Structure Spectroscopy (XAFS) is a powerful technique to investigate the local atomic geometry and the chemical state of atoms in different types of materials, especially if lacking a long-range order, such as nanomaterials, liquids, amorphous and highly disordered systems, and polymers containing metallic atoms. The INFN-LNF DAΦNE-Light DXR1 beam line is mainly dedicated to soft X-ray absorption spectroscopy; it collects the radiation of a wiggler insertion device and covers the energy range from 0.9 to 3.0 keV or the range going from the K-edge of Na through to the K-edge of Cl. The characteristics of the beamline are reported here together with the XAFS spectra of reference compounds, in order to show some of the information achievable with this X-ray spectroscopy. Additionally, some examples of XAFS spectroscopy applications are also reported.
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Taube F, Drobot B, Rossberg A, Foerstendorf H, Acker M, Patzschke M, Trumm M, Taut S, Stumpf T. Thermodynamic and Structural Studies on the Ln(III)/An(III) Malate Complexation. Inorg Chem 2018; 58:368-381. [DOI: 10.1021/acs.inorgchem.8b02474] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Franziska Taube
- TU Dresden, Central Radionuclide Laboratory, 01062 Dresden, Germany
| | - Björn Drobot
- TU Dresden, Central Radionuclide Laboratory, 01062 Dresden, Germany
| | - André Rossberg
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, 01328 Dresden, Germany
| | - Harald Foerstendorf
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, 01328 Dresden, Germany
| | - Margret Acker
- TU Dresden, Central Radionuclide Laboratory, 01062 Dresden, Germany
| | - Michael Patzschke
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, 01328 Dresden, Germany
| | - Michael Trumm
- Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung, 76021 Karlsruhe, Germany
| | - Steffen Taut
- TU Dresden, Central Radionuclide Laboratory, 01062 Dresden, Germany
| | - Thorsten Stumpf
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, 01328 Dresden, Germany
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24
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Jouve A, Nagy G, Somodi F, Tiozzo C, Villa A, Balerna A, Beck A, Evangelisti C, Prati L. Gold-silver catalysts: Effect of catalyst structure on the selectivity of glycerol oxidation. J Catal 2018. [DOI: 10.1016/j.jcat.2018.10.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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25
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Deblonde GJP, Lohrey TD, Booth CH, Carter KP, Parker BF, Larsen Å, Smeets R, Ryan OB, Cuthbertson AS, Abergel RJ. Solution Thermodynamics and Kinetics of Metal Complexation with a Hydroxypyridinone Chelator Designed for Thorium-227 Targeted Alpha Therapy. Inorg Chem 2018; 57:14337-14346. [PMID: 30372069 DOI: 10.1021/acs.inorgchem.8b02430] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The solution chemistry of a chelator developed for 227Th targeted alpha therapy was probed. The compound of interest is an octadentate ligand comprising four N-methyl-3-hydroxy-pyridine-2-one metal-binding units, two tertiary amine groups, and one carboxylate arm appended for bioconjugation. The seven p Ka values of the ligand and the stability constants of complexes formed with Th(IV), Hf(IV), Zr(IV), Gd(III), Eu(III), Al(III), and Fe(III) were determined. The ligand exhibits extreme thermodynamic selectivity toward tetravalent metal ions with a ca. 20 orders of magnitude difference between the formation constant of the Th(IV) species formed at physiological pH, namely [ThL]-, and that of its Eu(III) analogue. Likewise, log β110 values of 41.7 ± 0.3 and 26.9 ± 0.3 (T = 25 °C) were measured for [ThL]- and [FeIIIL]2-, respectively, highlighting the high affinity and selectivity of the ligand for Th ions over potentially competing endogenous metals. Single crystal X-ray analysis of the Fe(III) complex revealed a dinuclear 2:2 metal:chelator complex crystallizing in the space group P1̅. The formation of this dimeric species is likely favored by several intramolecular hydrogen bonds and the protonation state of the chelator in acidic media. LIII edge EXAFS data on the Th(IV) complexes of both the ligand and a monoclonal antibody conjugate revealed the expected mononuclear 1:1 metal:chelator coordination environment. This was also confirmed by high resolution mass spectrometry. Finally, kinetic experiments demonstrated that labeling the bioconjugated ligand with Th(IV) could be achieved and completed after 1 h at room temperature, reinforcing the high suitability of this chelator for 227Th targeted alpha therapy.
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Affiliation(s)
- Gauthier J-P Deblonde
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Trevor D Lohrey
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.,Department of Chemistry , University of California, Berkeley , California 94720 , United States
| | - Corwin H Booth
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Korey P Carter
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Bernard F Parker
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.,Department of Chemistry , University of California, Berkeley , California 94720 , United States
| | - Åsmund Larsen
- Department of Thorium Conjugate Research , Bayer AS , 0283 Oslo , Norway
| | - Roger Smeets
- Department of Thorium Conjugate Research , Bayer AS , 0283 Oslo , Norway
| | - Olav B Ryan
- Department of Thorium Conjugate Research , Bayer AS , 0283 Oslo , Norway
| | - Alan S Cuthbertson
- Department of Thorium Conjugate Research , Bayer AS , 0283 Oslo , Norway
| | - Rebecca J Abergel
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.,Department of Nuclear Engineering , University of California , Berkeley , California 94720 , United States
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26
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Deblonde GJ, Kelley MP, Su J, Batista ER, Yang P, Booth CH, Abergel RJ. Spectroscopic and Computational Characterization of Diethylenetriaminepentaacetic Acid/Transplutonium Chelates: Evidencing Heterogeneity in the Heavy Actinide(III) Series. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201709183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - Morgan P. Kelley
- Theoretical Division Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Jing Su
- Theoretical Division Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Enrique R. Batista
- Theoretical Division Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Ping Yang
- Theoretical Division Los Alamos National Laboratory Los Alamos NM 87545 USA
| | - Corwin H. Booth
- Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
| | - Rebecca J. Abergel
- Chemical Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
- Department of Nuclear Engineering University of California, Berkeley Berkeley CA 94720 USA
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27
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Kelley MP, Deblonde GJP, Su J, Booth CH, Abergel RJ, Batista ER, Yang P. Bond Covalency and Oxidation State of Actinide Ions Complexed with Therapeutic Chelating Agent 3,4,3-LI(1,2-HOPO). Inorg Chem 2018; 57:5352-5363. [DOI: 10.1021/acs.inorgchem.8b00345] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Morgan P. Kelley
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, United States
| | - Gauthier J.-P. Deblonde
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jing Su
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, United States
| | - Corwin H. Booth
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Rebecca J. Abergel
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Enrique R. Batista
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, United States
| | - Ping Yang
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, United States
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28
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Krawczyk-Bärsch E, Gerber U, Müller K, Moll H, Rossberg A, Steudtner R, Merroun ML. Multidisciplinary characterization of U(VI) sequestration by Acidovorax facilis for bioremediation purposes. JOURNAL OF HAZARDOUS MATERIALS 2018; 347:233-241. [PMID: 29324323 DOI: 10.1016/j.jhazmat.2017.12.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 12/04/2017] [Accepted: 12/10/2017] [Indexed: 06/07/2023]
Abstract
The contamination of the environment by U may affect plant life and consequently may have an impact on animal and human health. The present work describes U(VI) sequestration by Acidovorax facilis using a multidisciplinary approach combining wet chemistry, transmission electron microscopy, and spectroscopy methods (e.g. cryo-time resolved laser-induced fluorescence spectroscopy, extended X-ray absorption fine structure spectroscopy, and in-situ attenuated total reflection Fourier transform infrared spectroscopy). This bacterial strain is widely distributed in nature including U-contaminated sites. In kinetic batch experiments cells of A. facilis were contacted for 5 min to 48 h with 0.1 mM U(VI). The results show that the local coordination of U species associated with the cells depends upon time contact. U is bound mainly to phosphate groups of lipopolysaccharide (LPS) at the outer membrane within the first hour. And, that both, phosphoryl and carboxyl functionality groups of LPS and peptidoglycan of A. facilis cells may effectuate the removal of high U amounts from solution at 24-48 h of incubation. It is clearly demonstrated that A. facilis may play an important role in predicting the transport behaviour of U in the environment and that the results will contribute to the improvement of bioremediation methods of U-contaminated sites.
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Affiliation(s)
- E Krawczyk-Bärsch
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, D-01328 Dresden, Germany.
| | - U Gerber
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - K Müller
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - H Moll
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - A Rossberg
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - R Steudtner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - M L Merroun
- University of Granada, Department of Microbiology, Campus Fuentenueva, E-18071 Granada, Spain
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29
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Deblonde GJP, Kelley MP, Su J, Batista ER, Yang P, Booth CH, Abergel RJ. Spectroscopic and Computational Characterization of Diethylenetriaminepentaacetic Acid/Transplutonium Chelates: Evidencing Heterogeneity in the Heavy Actinide(III) Series. Angew Chem Int Ed Engl 2018; 57:4521-4526. [PMID: 29473263 DOI: 10.1002/anie.201709183] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 11/01/2017] [Indexed: 11/11/2022]
Abstract
The chemistry of trivalent transplutonium ions (Am3+ , Cm3+ , Bk3+ , Cf3+ , Es3+ …) is usually perceived as monotonic and paralleling that of the trivalent lanthanide series. Herein, we present the first extended X-ray absorption fine structure (EXAFS) study performed on a series of aqueous heavy actinide chelates, extending past Cm. The results obtained on diethylenetriaminepentaacetic acid (DTPA) complexes of trivalent Am, Cm, Bk, and Cf show a break to much shorter metal-oxygen nearest-neighbor bond lengths in the case of Cf3+ . Corroborating those results, density functional theory calculations, extended to Es3+ , suggest that the shorter Cf-O and Es-O bonds could arise from the departure of the coordinated water molecule and contraction of the ligand around the metal relative to the other [MIII DTPA(H2 O)]2- (M=Am, Cm, Bk) complexes. Taken together, these experimental and theoretical results demonstrate inhomogeneity within the trivalent transplutonium series that has been insinuated and debated in recent years, and that may also be leveraged for future nuclear waste reprocessing technologies.
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Affiliation(s)
- Gauthier J-P Deblonde
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Morgan P Kelley
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Jing Su
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Enrique R Batista
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Ping Yang
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Corwin H Booth
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Rebecca J Abergel
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.,Department of Nuclear Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA
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30
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Active sites of copper-complex catalytic materials for electrochemical carbon dioxide reduction. Nat Commun 2018; 9:415. [PMID: 29379087 PMCID: PMC5788987 DOI: 10.1038/s41467-018-02819-7] [Citation(s) in RCA: 304] [Impact Index Per Article: 50.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 01/02/2018] [Indexed: 11/08/2022] Open
Abstract
Restructuring-induced catalytic activity is an intriguing phenomenon of fundamental importance to rational design of high-performance catalyst materials. We study three copper-complex materials for electrocatalytic carbon dioxide reduction. Among them, the copper(II) phthalocyanine exhibits by far the highest activity for yielding methane with a Faradaic efficiency of 66% and a partial current density of 13 mA cm−2 at the potential of – 1.06 V versus the reversible hydrogen electrode. Utilizing in-situ and operando X-ray absorption spectroscopy, we find that under the working conditions copper(II) phthalocyanine undergoes reversible structural and oxidation state changes to form ~ 2 nm metallic copper clusters, which catalyzes the carbon dioxide-to-methane conversion. Density functional calculations rationalize the restructuring behavior and attribute the reversibility to the strong divalent metal ion–ligand coordination in the copper(II) phthalocyanine molecular structure and the small size of the generated copper clusters under the reaction conditions. The catalytic conversion of carbon dioxide into value-added products requires an understanding of the active species present under working conditions. Here, the authors discover copper-containing complexes to reversibly transform during electrocatalysis into methane-producing copper nanoclusters.
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31
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Ravel B, Newville M, Kas JJ, Rehr JJ. The effect of self-consistent potentials on EXAFS analysis. JOURNAL OF SYNCHROTRON RADIATION 2017; 24:1173-1179. [PMID: 29091060 DOI: 10.1107/s1600577517011651] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Accepted: 08/08/2017] [Indexed: 06/07/2023]
Abstract
A theory program intended for use with extended X-ray-absorption fine structure (EXAFS) spectroscopy and based on the popular FEFF8 is presented. It provides an application programming interface designed to make it easy to integrate high-quality theory into EXAFS analysis software. This new code is then used to examine the impact of self-consistent scattering potentials on EXAFS data analysis by methodical testing of theoretical fitting standards against a curated suite of measured EXAFS data. For each data set, the results of a fit are compared using a well characterized structural model and theoretical fitting standards computed both with and without self-consistent potentials. It is demonstrated that the use of self-consistent potentials has scant impact on the results of the EXAFS analysis.
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Affiliation(s)
- B Ravel
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - M Newville
- Center for Advanced Radiation Studies, University of Chicago, Chicago, IL 60637, USA
| | - J J Kas
- Department of Physics, University of Washington, Seattle, WA 98195, USA
| | - J J Rehr
- Department of Physics, University of Washington, Seattle, WA 98195, USA
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32
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Fröhlich DR, Kremleva A, Rossberg A, Skerencak-Frech A, Koke C, Krüger S, Rösch N, Panak PJ. Combined EXAFS Spectroscopic and Quantum Chemical Study on the Complex Formation of Am(III) with Formate. Inorg Chem 2017; 56:6820-6829. [DOI: 10.1021/acs.inorgchem.7b00035] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel R. Fröhlich
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Alena Kremleva
- Technische Universität München, Department Chemie, 85747 Garching, Germany
| | - André Rossberg
- Helmholtz-Zentrum Dresden Rossendorf, Institut für
Ressourcenökologie, P.O. Box 510119, 01314 Dresden, Germany
| | - Andrej Skerencak-Frech
- Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Carsten Koke
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
- Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Sven Krüger
- Technische Universität München, Department Chemie, 85747 Garching, Germany
| | - Notker Rösch
- Technische Universität München, Department Chemie, 85747 Garching, Germany
| | - Petra J. Panak
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
- Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany
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Evangelisti C, Balerna A, Psaro R, Fusini G, Carpita A, Benfatto M. Characterization of a Poly-4-Vinylpyridine-Supported CuPd Bimetallic Catalyst for Sonogashira Coupling Reactions. Chemphyschem 2017; 18:1921-1928. [DOI: 10.1002/cphc.201700215] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 04/13/2017] [Indexed: 02/04/2023]
Affiliation(s)
- Claudio Evangelisti
- Institute of Molecular Science and Technologies; CNR; via G. Fantoli 16/15 20138 Milano Italy
| | - Antonella Balerna
- Frascati National Laboratories; INFN; Via E. Fermi 40 00044 Frascati Roma Italy
| | - Rinaldo Psaro
- Institute of Molecular Science and Technologies; CNR; via G. Fantoli 16/15 20138 Milano Italy
| | - Graziano Fusini
- Institute of Molecular Science and Technologies; CNR; via G. Fantoli 16/15 20138 Milano Italy
- Department of Chemistry and Industrial Chemistry; University of Pisa; Via G. Moruzzi 13 56124 Pisa Italy
| | - Adriano Carpita
- Department of Chemistry and Industrial Chemistry; University of Pisa; Via G. Moruzzi 13 56124 Pisa Italy
| | - Maurizio Benfatto
- Frascati National Laboratories; INFN; Via E. Fermi 40 00044 Frascati Roma Italy
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Feng Q, Zhao S, Wang Y, Dong J, Chen W, He D, Wang D, Yang J, Zhu Y, Zhu H, Gu L, Li Z, Liu Y, Yu R, Li J, Li Y. Isolated Single-Atom Pd Sites in Intermetallic Nanostructures: High Catalytic Selectivity for Semihydrogenation of Alkynes. J Am Chem Soc 2017; 139:7294-7301. [DOI: 10.1021/jacs.7b01471] [Citation(s) in RCA: 270] [Impact Index Per Article: 38.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Quanchen Feng
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Shu Zhao
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yu Wang
- Shanghai Synchrontron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
| | - Juncai Dong
- Beijing Synchrotron
Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Wenxing Chen
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Dongsheng He
- Materials Characterization and Preparation Center, South University of Science and Technology of China, Shenzhen 518055, China
| | - Dingsheng Wang
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Jun Yang
- Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing 100124, China
| | - Yuanmin Zhu
- Beijing National Center for Electron Microscopy, School
of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Hailiang Zhu
- Beijing Synchrotron
Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Lin Gu
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhi Li
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yuxi Liu
- Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing 100124, China
| | - Rong Yu
- Beijing National Center for Electron Microscopy, School
of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Jun Li
- Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yadong Li
- Department of Chemistry, Tsinghua University, Beijing 100084, China
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Fröhlich DR, Maiwald MM, Taube F, Plank J, Panak PJ. A thermodynamical and structural study on the complexation of trivalent lanthanides with a polycarboxylate based concrete superplasticizer. Dalton Trans 2017; 46:4093-4100. [PMID: 28275778 DOI: 10.1039/c7dt00200a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The complexation of trivalent lanthanides with a commercial polycarboxylate based concrete superplasticizer (Glenium® 51) is investigated using different spectroscopic techniques. Time-resolved laser fluorescence spectroscopy (TRLFS) in combination with a charge neutralization model is used to determine temperature dependent conditional stability constants (log β'(T)) for the complexation of Eu(iii) with Glenium® 51 in 0.1 mol kg-1 NaCl solution in the temperature range of 20-90 °C. Only one complex species is observed, and log β'(T) (given in kg per mol eq) shows a very slight increase with temperature from 7.5 to 7.9. The related conditional molar reaction enthalpy (ΔrH'm) and entropy (ΔrS'm) obtained using the Van't Hoff equation show that the complexation reaction is slightly endothermic and entropy driven. The thermodynamic investigations are complemented by structural data for complexes formed with Gd(iii) or Tb(iii) and Glenium® 51 using extended X-ray absorption fine structure (EXAFS) spectroscopy. The results imply a non-chelate coordination of the trivalent metals through approximately three carboxylic functions of the polycarboxylate comb polymer which are attached predominantly in a bidentate fashion to the lanthanide under the given experimental conditions.
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Affiliation(s)
- Daniel R Fröhlich
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany.
| | - Martin M Maiwald
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany. and Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Franziska Taube
- Technische Universität Dresden, Fakultät Mathematik und Naturwissenschaften, Fachrichtung Chemie und Lebensmittelchemie, Professur für Radiochemie/Radioökologie, 01062 Dresden, Germany
| | - Johann Plank
- Technische Universität München, Lehrstuhl für Bauchemie, Lichtenbergstr. 4, 85747 Garching, Germany
| | - Petra J Panak
- Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany. and Karlsruher Institut für Technologie, Institut für Nukleare Entsorgung, P.O. Box 3640, 76021 Karlsruhe, Germany
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37
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Fröhlich DR, Skerencak-Frech A, Kaplan U, Koke C, Rossberg A, Panak PJ. An EXAFS spectroscopic study of Am(III) complexation with lactate. JOURNAL OF SYNCHROTRON RADIATION 2015; 22:1469-1474. [PMID: 26524312 DOI: 10.1107/s1600577515017853] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 09/23/2015] [Indexed: 06/05/2023]
Abstract
The pH dependence (1-7) of Am(III) complexation with lactate in aqueous solution is studied using extended X-ray absorption fine-structure (EXAFS) spectroscopy. Structural data (coordination numbers, Am--O and Am--C distances) of the formed Am(III)-lactate species are determined from the raw k(3)-weighted Am LIII-edge EXAFS spectra. Between pH 1 and pH 6, Am(III) speciation shifts continuously towards complexed species with increasing pH. At higher pH, the amount of complexed species decreases due to formation of hydroxo species. The coordination numbers and distances (3.41-3.43 Å) of the coordinating carbon atoms clearly point out that lactate is bound `side-on' to Am(III) through both the carboxylic and the α-hydroxy function of lactate. The experimentally determined coordination numbers are compared with speciation calculations on the basis of tabulated thermodynamic stability constants. Both EXAFS data and thermodynamic modelling are in very good agreement. The EXAFS spectra are also analyzed by iterative transformation factor analysis to further verify the determined Am(III) speciation and the used structural model.
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Affiliation(s)
- Daniel R Fröhlich
- Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 253, Heidelberg 69120, Germany
| | - Andrej Skerencak-Frech
- Institut für Nukleare Entsorgung, Karlsruher Institut für Technologie, PO Box 3640, Karlsruhe 76021, Germany
| | - Ugras Kaplan
- Institut für Nukleare Entsorgung, Karlsruher Institut für Technologie, PO Box 3640, Karlsruhe 76021, Germany
| | - Carsten Koke
- Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 253, Heidelberg 69120, Germany
| | - André Rossberg
- Institut für Resourcenökologie, Helmholtz-Zentrum Dresden-Rossendorf, PO 510119, Dresden 01314, Germany
| | - Petra J Panak
- Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 253, Heidelberg 69120, Germany
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38
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Kelly SD, Hesterberg D, Ravel B. Analysis of Soils and Minerals Using X-ray Absorption Spectroscopy. METHODS OF SOIL ANALYSIS PART 5-MINERALOGICAL METHODS 2015. [DOI: 10.2136/sssabookser5.5.c14] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Affiliation(s)
- S. D. Kelly
- Argonne National Laboratory; Argonne Illinois
| | - D. Hesterberg
- North Carolina State University; Raleigh North Carolina
| | - B. Ravel
- Argonne National Laboratory; Argonne Illinois
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39
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Ravel B. Muffin-tin potentials in EXAFS analysis. JOURNAL OF SYNCHROTRON RADIATION 2015; 22:1258-1262. [PMID: 26289277 DOI: 10.1107/s1600577515013521] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 07/14/2015] [Indexed: 06/04/2023]
Abstract
Muffin-tin potentials are the standard tool for calculating the potential surface of a cluster of atoms for use in the analysis of extended X-ray absorption fine-structure (EXAFS) data. The set of Cartesian coordinates used to define the positions of atoms in the cluster and to calculate the muffin-tin potentials is commonly also used to enumerate the scattering paths used in the EXAFS data analysis. In this paper, it is shown that these muffin-tin potentials are sufficiently robust to be used to examine quantitatively contributions to the EXAFS data from scattering geometries not represented in the original cluster.
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Affiliation(s)
- B Ravel
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
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40
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Hacisalihoglu MY, Paris E, Joseph B, Yanmaz E, Saini NL. The nanoscale structure and unoccupied valence electronic states in FeSe1-xTex chalcogenides probed by X-ray absorption measurements. Phys Chem Chem Phys 2015; 17:18131-7. [PMID: 26099493 DOI: 10.1039/c5cp01740h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have studied the nanoscale structure and unoccupied electronic states in FeSe1-xTex by a combined analysis of Se K, Te L1 and Fe K-edges X-ray absorption measurements. Extended X-ray absorption fine structure (EXAFS) results show that iron-chalcogen (Fe-Se and Fe-Te) distances in ternary FeSe1-xTex are similar to those measured for binary FeSe and FeTe. The local Fe-Se/Te distances determined by different absorption edges fit well in the characteristic Z-plot of random alloys, providing unambiguous support to the inhomogeneous nanoscale structure of the ternary FeSe1-xTex system. X-ray absorption near-edge structure (XANES) spectra reveal a gradual evolution of the unoccupied valence electronic states as a function of Te-substitution in FeSe1-xTex. The Fe 3d-Se 4p/Te 5p hybridization is found to decrease with Te-substitution, accompanied by an increase in unoccupied Se 4p states and a decrease in unoccupied Te 5p states. The results are discussed in the frame of local inhomogeneity in the FeSe1-xTex system driven by random alloying of Se/Te atoms.
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Affiliation(s)
- M Y Hacisalihoglu
- Dipartimento di Fisica, Universitá di Roma "La Sapienza", P. le Aldo Moro 2, 00185 Rome, Italy.
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41
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Tamasi AL, Boland KS, Czerwinski K, Ellis JK, Kozimor SA, Martin RL, Pugmire AL, Reilly D, Scott BL, Sutton AD, Wagner GL, Walensky JR, Wilkerson MP. Oxidation and Hydration of U3O8 Materials Following Controlled Exposure to Temperature and Humidity. Anal Chem 2015; 87:4210-7. [DOI: 10.1021/ac504105t] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alison L. Tamasi
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
- Department
of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, United States
| | - Kevin S. Boland
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Kenneth Czerwinski
- Department
of Chemistry and Biochemistry, University of Nevada-Las Vegas, Las Vegas, Nevada 89154, United States
| | - Jason K. Ellis
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Stosh A. Kozimor
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Richard L. Martin
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Alison L. Pugmire
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Dallas Reilly
- Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Brian L. Scott
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Andrew D. Sutton
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Gregory L. Wagner
- Los Alamos National Laboratory, Los
Alamos, New Mexico 87545, United States
| | - Justin R. Walensky
- Department
of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, United States
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42
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Feng Z, Ma Q, Lu J, Feng H, Elam JW, Stair PC, Bedzyk MJ. Atomic-scale cation dynamics in a monolayer VOX/α-Fe2O3 catalyst. RSC Adv 2015. [DOI: 10.1039/c5ra18404e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
A combination of in situ XAS and FTIR shows the redox-induced vanadium cation dynamics on the surfaces of Fe2O3 powders.
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Affiliation(s)
- Z. Feng
- Department of Materials Science and Engineering
- Northwestern University
- Evanston
- USA
- Chemical Sciences and Engineering Division
| | - Q. Ma
- DND-CAT
- Synchrotron Research Center
- Northwestern University
- Evanston
- USA
| | - J. Lu
- Energy Systems Division
- Argonne National Laboratory
- Lemont
- USA
- Department of Chemical Physics
| | - H. Feng
- Energy Systems Division
- Argonne National Laboratory
- Lemont
- USA
- Xi'an Modern Chemistry Research Institute
| | - J. W. Elam
- Energy Systems Division
- Argonne National Laboratory
- Lemont
- USA
| | - P. C. Stair
- Department of Chemistry
- Northwestern University
- Evanston
- USA
| | - M. J. Bedzyk
- Department of Materials Science and Engineering
- Northwestern University
- Evanston
- USA
- Department of Physics and Astronomy
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43
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Ravel B. Path degeneracy and EXAFS analysis of disordered materials. JOURNAL OF SYNCHROTRON RADIATION 2014; 21:1269-1274. [PMID: 25343794 DOI: 10.1107/s1600577514014982] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Accepted: 06/25/2014] [Indexed: 06/04/2023]
Abstract
Analysis of EXAFS data measured on a material with a disordered local configuration environment around the absorbing atom can be challenging owing to the proliferation of photoelectron scattering paths that must be considered in the analysis. In the case where the absorbing atom exists in multiple inequivalent sites, the problem is compounded by having to consider each site separately. A method is proposed for automating the calculation of theory for inequivalent sites, then averaging the contributions from sufficiently similar scattering paths. With this approach, the complexity of implementing a successful fitting model on a highly disordered sample is reduced. As an example, an analysis of Ti K-edge data on zirconolite, CaZrTi2O7, which has three inequivalent Ti sites, is presented.
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Affiliation(s)
- Bruce Ravel
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
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44
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Krause B, Darma S, Kaufholz M, Mangold S, Doyle S, Ulrich S, Leiste H, Stüber M, Baumbach T. Composition-dependent structure of polycrystalline magnetron-sputtered V-Al-C-N hard coatings studied by XRD, XPS, XANES and EXAFS. J Appl Crystallogr 2013; 46:1064-1075. [PMID: 24046506 PMCID: PMC3769060 DOI: 10.1107/s0021889813014477] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Accepted: 05/25/2013] [Indexed: 11/11/2022] Open
Abstract
V-Al-C-N hard coatings with high carbon content were deposited by reactive radio-frequency magnetron sputtering using an experimental combinatorial approach, deposition from a segmented sputter target. The composition-dependent coexisting phases within the coating were analysed using the complementary methods of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray absorption near-edge spectroscopy (XANES) and extended X-ray absorption fine-structure spectroscopy (EXAFS). For the analysis of the X-ray absorption near-edge spectra, a new approach for evaluation of the pre-edge peak was developed, taking into account the self-absorption effects in thin films. Within the studied composition range, a mixed face-centred cubic (V,Al)(C,N) phase coexisting with a C-C-containing phase was observed. No indication of hexagonal (V,Al)(N,C) was found. The example of V-Al-C-N demonstrates how important a combination of complementary methods is for the detection of coexisting phases in complex multi-element coatings.
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Affiliation(s)
- Bärbel Krause
- Institut für Photonenforschung und Synchrotronstrahlung (IPS), Karlsruher Institut für Technologie, Karlsruhe, Germany
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45
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Lucks C, Rossberg A, Tsushima S, Foerstendorf H, Scheinost AC, Bernhard G. Aqueous Uranium(VI) Complexes with Acetic and Succinic Acid: Speciation and Structure Revisited. Inorg Chem 2012; 51:12288-300. [PMID: 23110741 DOI: 10.1021/ic301565p] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christian Lucks
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), P.O. Box
510119, 01314 Dresden, Germany
- The Rossendorf Beamline at the European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex, France
| | - André Rossberg
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), P.O. Box
510119, 01314 Dresden, Germany
- The Rossendorf Beamline at the European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex, France
| | - Satoru Tsushima
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), P.O. Box
510119, 01314 Dresden, Germany
| | - Harald Foerstendorf
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), P.O. Box
510119, 01314 Dresden, Germany
| | - Andreas C. Scheinost
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), P.O. Box
510119, 01314 Dresden, Germany
- The Rossendorf Beamline at the European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex, France
| | - Gert Bernhard
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), P.O. Box
510119, 01314 Dresden, Germany
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46
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Evangelisti C, Schiavi E, Aronica LA, Caporusso AM, Vitulli G, Bertinetti L, Martra G, Balerna A, Mobilio S. Bimetallic Gold–Palladium vapour derived catalysts: The role of structural features on their catalytic activity. J Catal 2012. [DOI: 10.1016/j.jcat.2011.11.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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47
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Wang S, Diwu J, Simonetti A, Booth CH, Albrecht-Schmitt TE. Interstitial incorporation of plutonium into a low-dimensional potassium borate. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:9457-9463. [PMID: 21932804 DOI: 10.1021/es2028247] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The molten boric acid flux reaction of PuBr(3) with KBO(2) at 200 °C results in the formation of large light-yellow crystals of K[B(5)O(7)(OH)(2)]·H(2)O:Pu(4+). Single-crystal X-ray diffraction experiments on the Pu-doped K[B(5)O(7)(OH)(2)]·H(2)O demonstrate two features: (1) K[B(5)O(7)(OH)(2)]·H(2)O:Pu(4+) adopts a one-dimensional borate chain structure with void spaces between the chains. (2) The doping plutonium atoms do not reside on the potassium sites. The latter are not fully occupied. Both laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and energy-dispersive spectrometry analyses indicate that plutonium atoms are uniformly distributed in crystals of K[B(5)O(7)(OH)(2)]·H(2)O with an atomic K:Pu ratio of approximately 65:1 measured by LA-ICP-MS. UV-vis-NIR spectra taken from both freshly made and one day old crystals show that the plutonium present within the crystals is predominantly characterized by Pu(IV). A small amount of Pu(III) is also present initially, but slowly oxidized to Pu(IV) via interaction with oxygen in the air. X-ray absorption near-edge structure and extended X-ray absorption fine structure spectroscopic measurements confirm that plutonium is mainly present as a form similar to that of a PuO(2) cluster. The combined results suggest that the clusters containing Pu(IV) ions are uniformly distributed in the void spaces between the borate chains.
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Affiliation(s)
- Shuao Wang
- Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, Indiana 46556, United States
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48
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Car B, Medling S, Corrado C, Bridges F, Zhang JZ. Probing the local structure of dilute Cu dopants in fluorescent ZnS nanocrystals using EXAFS. NANOSCALE 2011; 3:4182-4189. [PMID: 21850357 DOI: 10.1039/c1nr10556f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A local structure study of ZnS nanocrystals, doped with very low concentrations of Cu, was carried out using the EXAFS technique to better understand how Cu substitutes into the host lattice and forms Cu luminescence centers. We show that a large fraction of the Cu have three nearest neighbor S atoms and the Cu-S bond is significantly shortened compared to Zn-S, by ∼0.08 Å. In addition, the second neighbor Cu-Cu peak is extremely small. We propose that Cu occupies an interior site next to a S(2-) vacancy, with the Cu displaced towards the remaining S(2-) and away from the vacancy; such a displacement immediately explains the lack of a significant Cu-Cu peak in the data. There is no evidence for interstitial Cu sites (Cu(i)), indicating that no more than 2% of the Cu are Cu(i.) This study provides new insights into the local structure of the Cu dopant in ZnS without the presence of CuS nanoprecipitates that are present at higher Cu doping levels.
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Affiliation(s)
- Brad Car
- Physics Department, UC Santa Cruz
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49
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Zhang Z, Rao L, Rai D, Clark SB. Characterization of Chromium(III) Hydroxide Solids and Their Oxidation by Hydrogen Peroxide. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-824-cc6.5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractChromium is of great concern in the vitrification of high-level nuclear waste sludges because it forms separate crystallites in the molten glass. Inadequate removal of chromium from sludges could result in the production of an unacceptably large volume of HLW glass. Alkaline oxidative leaching is considered one of the pretreatment strategies to remove chromium before the vitrification.In this study, Cr(III) hydroxide solids were prepared under different conditions and characterized by EXAFS and IR. The rate of oxidation of the solids by hydrogen peroxide in alkaline solutions was studied by UV absorption spectroscopy. EXAFS and IR experiments indicate that the degree of oligomerization in the Cr(III) hydroxide solids increases with the increase in the concentration of NaOH in solution, the aging temperature and the aging time. The rate of oxidation of the solids follows the same order previously observed for Cr(III) oligomers in solution, i.e., species with higher degree of oligomerization are oxidized more slowly.
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50
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Abstract
Abstract
Plutonium subsurface mobility is primarily controlled by its oxidation state, which in turn is loosely coupled to the oxidation state of iron in the system. Experiments were conducted to examine the effect of sediment iron mineral composition and oxidation state on plutonium sorption and reduction. A pH 6.3 vadose zone sediment containing iron oxides and iron-containing phyllosilicates was treated with various complexants (ammonium oxalate) and reductants (hydroxylamine hydrochloride and dithionite-citrate-bicarbonate (DCB)) to selectively leach and/or reduce iron oxide and phyllosilicate/clay Fe(III). 57Fe-Mössbauer spectroscopy was used to identify initial iron mineral composition of the sediment and monitor dissolution and reduction of iron oxides and reduction of phyllosilicate Fe(III). 57Fe-Mössbauer spectroscopy showed that the Fe-mineral composition of the untreated sediment is: 25–30% hematite, 60–65% small-particle/Al-goethite, and <10% Fe(III) in phyllosilicate; there was no detectable Fe(II). Upon reduction with a strong chemical reductant (dithionite-citrate-bicarbonate buffer), much of the hematite and goethite was removed. Partial reduction of phyllosilicate Fe(III) was evident in the sediments subjected to DCB treatment. Sorption of Pu(V) was monitored over one week for the untreated and each of five treated sediment fractions. Plutonium oxidation state speciation in the aqueous and solid phases was monitored using solvent extraction, coprecipitation, and XANES. The rate of sorption appears to correlate with the fraction of Fe(II) in the sediment (untreated or treated). Pu(V) was the only oxidation state measured in the aqueous phase, irrespective of treatment, whereas Pu(IV) and much smaller amounts of Pu(V) and Pu(VI) were measured in the solid phase. Surface-mediated reduction of Pu(V) to Pu(IV) occurred in treated and untreated sediment samples; Pu(V) remained on untreated sediment surface for two days before reducing to Pu(IV). Similar to the sorption kinetics, the reduction rate appears to be correlated with sediment Fe(II) concentration. The correlation between Fe(II) concentrations and Pu(V) reduction demonstrates the potential impact of changing iron mineralogy on plutonium subsurface transport through redox transition areas. These findings should influence the conceptual models of long-term stewardship of Pu contaminated sites that have fluctuating redox conditions, such as vadose zones or riparian zones.
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