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Sidorowicz A, Yigit N, Wicht T, Stöger-Pollach M, Concas A, Orrù R, Cao G, Rupprechter G. Microalgae-derived Co 3O 4 nanomaterials for catalytic CO oxidation. RSC Adv 2024; 14:4575-4586. [PMID: 38318608 PMCID: PMC10839636 DOI: 10.1039/d4ra00343h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Accepted: 01/30/2024] [Indexed: 02/07/2024] Open
Abstract
Efficient carbon monoxide oxidation is important to reduce its impacts on both human health and the environment. Following a sustainable synthesis route toward new catalysts, nanosized Co3O4 was synthesized based on extracts of microalgae: Spirulina platensis, Chlorella vulgaris, and Haematococcus pluvialis. Using the metabolites in the extract and applying different calcination temperatures (450, 650, 800 °C) led to Co3O4 catalysts with distinctly different properties. The obtained Co3O4 nanomaterials exhibited octahedral, nanosheet, and spherical morphologies with structural defects and surface segregation of phosphorous and potassium, originating from the extracts. The presence of P and K in the oxide nanostructures significantly improved their catalytic CO oxidation activity. When normalized by the specific surface area, the microalgae-derived catalysts exceeded a commercial benchmark catalyst. In situ studies revealed differences in oxygen mobility and carbonate formation during the reaction. The obtained insights may facilitate the development of new synthesis strategies for manufacturing highly active Co3O4 nanocatalysts.
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Affiliation(s)
- Agnieszka Sidorowicz
- Interdepartmental Centre of Environmental Engineering and Sciences, University of Cagliari 09123 Cagliari Italy
| | - Nevzat Yigit
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/BC 1060 Vienna Austria
| | - Thomas Wicht
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/BC 1060 Vienna Austria
| | - Michael Stöger-Pollach
- University Service Center for Transmission Electron Microscopy, TU Wien Wiedner Hauptstr. 8-10 1040 Vienna Austria
| | - Alessandro Concas
- Interdepartmental Centre of Environmental Engineering and Sciences, University of Cagliari 09123 Cagliari Italy
| | - Roberto Orrù
- Interdepartmental Centre of Environmental Engineering and Sciences, University of Cagliari 09123 Cagliari Italy
| | - Giacomo Cao
- Interdepartmental Centre of Environmental Engineering and Sciences, University of Cagliari 09123 Cagliari Italy
| | - Günther Rupprechter
- Institute of Materials Chemistry, TU Wien Getreidemarkt 9/BC 1060 Vienna Austria
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2
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Zhou F, Li X, Wang S, Qu X, Zhao J, Wang D, Chen Z, Yin H. Recovery of valuable metals from spent lithium-ion batteries through biomass pyrolysis gas-induced reduction. JOURNAL OF HAZARDOUS MATERIALS 2023; 459:132150. [PMID: 37541117 DOI: 10.1016/j.jhazmat.2023.132150] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 07/18/2023] [Accepted: 07/23/2023] [Indexed: 08/06/2023]
Abstract
The development of spent lithium-ion batteries (LIBs) recycling technologies can effectively alleviate environmental pressure and conserve metal resources. We propose a win-win strategy for pyrolysis gas reduction by lignocellulosic biomass, ensuring gas-induced reduction by spatial isolation of biomass and lithium transition metal oxides (LiTMOX (TM = Ni, Co, Mn)), and avoiding the separation of solid carbon and TMOX (TM = Ni, Co, Mn). In the spent LiCoO2 batteries, the lithium recovery efficiency reaches 99.99% and purity reaches 98.3% at 500 °C. In addition, biomass pyrolysis gas reduction is also applicable to treat spent LiMn2O4 and LiNi0.6Co0.2Mn0.2O2 batteries. Thermodynamic analysis verifies that CO dominates the gas reduction recovery process. DFT calculation indicates that the gas reduction induces the collapse of the oxygen framework of LiTMOX (TM = Ni, Co, Mn). Everbatt-based economic and environmental analysis illustrates that this is an environment-friendly and energy-saving method.
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Affiliation(s)
- Fengyin Zhou
- School of Resource and Environmental Science, Wuhan University, 299 Bayi Road, Wuchang, Wuhan 430072, PR China; Joint Center of Green Manufacturing of Energy Storage Materials of Wuhan University and Chilwee, Wuhan 430072, PR China
| | - Xiangyun Li
- School of Resource and Environmental Science, Wuhan University, 299 Bayi Road, Wuchang, Wuhan 430072, PR China; Joint Center of Green Manufacturing of Energy Storage Materials of Wuhan University and Chilwee, Wuhan 430072, PR China
| | - Shiyu Wang
- School of Resource and Environmental Science, Wuhan University, 299 Bayi Road, Wuchang, Wuhan 430072, PR China
| | - Xin Qu
- School of Resource and Environmental Science, Wuhan University, 299 Bayi Road, Wuchang, Wuhan 430072, PR China; Joint Center of Green Manufacturing of Energy Storage Materials of Wuhan University and Chilwee, Wuhan 430072, PR China
| | - Jingjing Zhao
- School of Resource and Environmental Science, Wuhan University, 299 Bayi Road, Wuchang, Wuhan 430072, PR China; Joint Center of Green Manufacturing of Energy Storage Materials of Wuhan University and Chilwee, Wuhan 430072, PR China
| | - Dihua Wang
- School of Resource and Environmental Science, Wuhan University, 299 Bayi Road, Wuchang, Wuhan 430072, PR China; Joint Center of Green Manufacturing of Energy Storage Materials of Wuhan University and Chilwee, Wuhan 430072, PR China; Hubei International Scientific and Technological Cooperation Base of Sustainable Resources and Energy, Wuhan 430072, PR China
| | - Zhiliang Chen
- Jiangmen Public Utilities Group, Jiangmen 529200, PR China
| | - Huayi Yin
- School of Resource and Environmental Science, Wuhan University, 299 Bayi Road, Wuchang, Wuhan 430072, PR China; Joint Center of Green Manufacturing of Energy Storage Materials of Wuhan University and Chilwee, Wuhan 430072, PR China; Hubei International Scientific and Technological Cooperation Base of Sustainable Resources and Energy, Wuhan 430072, PR China.
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Liu H, Liu W, Xue G, Tan T, Yang C, An P, Chen W, Zhao W, Fan T, Cui C, Tang Z, Li G. Modulating Charges of Dual Sites in Multivariate Metal-Organic Frameworks for Boosting Selective Aerobic Epoxidation of Alkenes. J Am Chem Soc 2023; 145:11085-11096. [PMID: 37162302 DOI: 10.1021/jacs.3c00460] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Selective aerobic epoxidation of alkenes without any additives is of great industrial importance but still challenging because the competitive side reactions including C═C bond cleavage and isomerization are difficult to avoid. Here, we show fabricating Cu(I) single sites in pristine multivariate metal-organic frameworks (known as CuCo-MOF-74) via partial reduction of Cu(II) to Cu(I) ions during solvothermal reaction. Impressively, CuCo-MOF-74 is characteristic with single Cu(I), Cu(II), and Co(II) sites, and they exhibit the substantially enhanced selectivity of styrene oxide up to 87.6% using air as an oxidant at almost complete conversion of styrene, ∼25.8% selectivity increased over Co-MOF-74, as well as good catalytic stability. Contrast experiments and theoretical calculation indicate that Cu(I) sites contribute to the substantially enhanced selectivity of epoxides catalyzed by Co(II) sites. The adsorption of two O2 molecules on dual Co(II) and Cu(I) sites is favorable, and the projected density of state of the Co-3d orbital is closer to the Fermi level by modulating with Cu(I) sites for promoting the activation of O2 compared with dual-site Cu(II) and Co(II) and Co(II) and Co(II), thus contributing to the epoxidation of the C═C bond. When other kinds of alkenes are used as substrates, the excellent selectivity of various epoxides is also achieved over CuCo-MOF-74. We also prove the universality of fabricating Cu(I) sites in other MOF-74 with various divalent metal nodes.
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Affiliation(s)
- Hanlin Liu
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Wei Liu
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Guangxin Xue
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Ting Tan
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Caoyu Yang
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Pengfei An
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Wenxing Chen
- School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100181, P. R. China
| | - Wenshi Zhao
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Ting Fan
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Chengqian Cui
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Zhiyong Tang
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Guodong Li
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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Yigit N, Genest A, Terloev S, Möller J, Rupprechter G. Active sites and deactivation of room temperature CO oxidation on Co 3O 4catalysts: combined experimental and computational investigations. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:354001. [PMID: 35588721 DOI: 10.1088/1361-648x/ac718b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 05/19/2022] [Indexed: 06/15/2023]
Abstract
Co3O4is a well-known low temperature CO oxidation catalyst, but it often suffers from deactivation. We have thus examined room temperature (RT) CO oxidation on Co3O4catalysts by operando DSC, TGA and MS measurements, as well as by pulsed chemisorption to differentiate the contributions of CO adsorption and reaction to CO2. Catalysts pretreated in oxygen at 400 °C are most active, with the initial interaction of CO and Co3O4being strongly exothermic and with maximum amounts of CO adsorption and reaction. The initially high RT activity then levels-off, suggesting that the oxidative pretreatment creates an oxygen-rich reactive Co3O4surface that upon reaction onset loses its most active oxygen. This specific active oxygen is not reestablished by gas phase O2during the RT reaction. When the reaction temperature is increased to 150 °C, full conversion can be maintained for 100 h, and even after cooling back to RT. Apparently, deactivating species are avoided this way, whereas exposing the active surface even briefly to pure CO leads to immediate deactivation. Computational modeling using DFT helped to identify the CO adsorption sites, determine oxygen vacancy formation energies and the origin of deactivation. A new species of CO bonded to oxygen vacancies at RT was identified, which may block a vacancy site from further reaction unless CO is removed at higher temperature. The interaction between oxygen vacancies was found to be small, so that in the active state several lattice oxygen species are available for reaction in parallel.
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Affiliation(s)
- Nevzat Yigit
- Institute of Materials Chemistry, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria
| | - Alexander Genest
- Institute of Materials Chemistry, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria
| | - Schamil Terloev
- Institute of Materials Chemistry, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria
| | - Jury Möller
- Institute of Materials Chemistry, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria
| | - Günther Rupprechter
- Institute of Materials Chemistry, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria
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5
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Yang J, Yigit N, Möller J, Rupprechter G. Co 3 O 4 -CeO 2 Nanocomposites for Low-Temperature CO Oxidation. Chemistry 2021; 27:16947-16955. [PMID: 33913575 PMCID: PMC9292333 DOI: 10.1002/chem.202100927] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Indexed: 11/10/2022]
Abstract
In an effort to combine the favorable catalytic properties of Co3 O4 and CeO2 , nanocomposites with different phase distribution and Co3 O4 loading were prepared and employed for CO oxidation. Synthesizing Co3 O4 -modified CeO2 via three different sol-gel based routes, each with 10.4 wt % Co3 O4 loading, yielded three different nanocomposite morphologies: CeO2 -supported Co3 O4 layers, intermixed oxides, and homogeneously dispersed Co. The reactivity of the resulting surface oxygen species towards CO were examined by temperature programmed reduction (CO-TPR) and flow reactor kinetic tests. The first morphology exhibited the best performance due to its active Co3 O4 surface layer, reducing the light-off temperature of CeO2 by about 200 °C. In contrast, intermixed oxides and Co-doped CeO2 suffered from lower dispersion and organic residues, respectively. The performance of Co3 O4 -CeO2 nanocomposites was optimized by varying the Co3 O4 loading, characterized by X-ray diffraction (XRD) and N2 sorption (BET). The 16-65 wt % Co3 O4 -CeO2 catalysts approached the conversion of 1 wt % Pt/CeO2 , rendering them interesting candidates for low-temperature CO oxidation.
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Affiliation(s)
- Jingxia Yang
- Institute of Materials Chemistry, Technische Universität Wien, Getreidemarkt 9/BC/01, 1060-, Vienna, Austria.,College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Longteng Rd 333, Songjiang, Shanghai, (P.R., China
| | - Nevzat Yigit
- Institute of Materials Chemistry, Technische Universität Wien, Getreidemarkt 9/BC/01, 1060-, Vienna, Austria
| | - Jury Möller
- Institute of Materials Chemistry, Technische Universität Wien, Getreidemarkt 9/BC/01, 1060-, Vienna, Austria
| | - Günther Rupprechter
- Institute of Materials Chemistry, Technische Universität Wien, Getreidemarkt 9/BC/01, 1060-, Vienna, Austria
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6
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Rupprechter G. Operando Surface Spectroscopy and Microscopy during Catalytic Reactions: From Clusters via Nanoparticles to Meso-Scale Aggregates. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2004289. [PMID: 33694320 DOI: 10.1002/smll.202004289] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 02/16/2021] [Indexed: 05/16/2023]
Abstract
Operando characterization of working catalysts, requiring per definitionem the simultaneous measurement of catalytic performance, is crucial to identify the relevant catalyst structure, composition and adsorbed species. Frequently applied operando techniques are discussed, including X-ray absorption spectroscopy, near ambient pressure X-ray photoelectron spectroscopy and infrared spectroscopy. In contrast to these area-averaging spectroscopies, operando surface microscopy by photoemission electron microscopy delivers spatially-resolved data, directly visualizing catalyst heterogeneity. For thorough interpretation, the experimental results should be complemented by density functional theory. The operando approach enables to identify changes of cluster/nanoparticle structure and composition during ongoing catalytic reactions and reveal how molecules interact with surfaces and interfaces. The case studies cover the length-scales from clusters via nanoparticles to meso-scale aggregates, and demonstrate the benefits of specific operando methods. Restructuring, ligand/atom mobility, and surface composition alterations during the reaction may have pronounced effects on activity and selectivity. The nanoscale metal/oxide interface steers catalytic performance via a long ranging effect. Combining operando spectroscopy with switching gas feeds or concentration-modulation provides further mechanistic insights. The obtained fundamental understanding is a prerequisite for improving catalytic performance and for rational design.
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Affiliation(s)
- Günther Rupprechter
- Institute of Materials Chemistry, Technische Universität Wien, Getreidemarkt 9/BC/01, Vienna, 1060, Austria
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7
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Zhong L, Barreau M, Caps V, Papaefthimiou V, Haevecker M, Teschner D, Baaziz W, Borfecchia E, Braglia L, Zafeiratos S. Improving the Catalytic Performance of Cobalt for CO Preferential Oxidation by Stabilizing the Active Phase through Vanadium Promotion. ACS Catal 2021. [DOI: 10.1021/acscatal.0c05482] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Liping Zhong
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), ECPM, UMR 7515 CNRS − Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France
| | - Mathias Barreau
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), ECPM, UMR 7515 CNRS − Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France
| | - Valérie Caps
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), ECPM, UMR 7515 CNRS − Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France
| | - Vasiliki Papaefthimiou
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), ECPM, UMR 7515 CNRS − Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France
| | - Michael Haevecker
- Max-Planck-Institut für Chemische Energiekonversion (MPI-CEC), Stiftstrasse 34-36, D-45470 Mülheim a.d. Ruhr, Germany
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Detre Teschner
- Max-Planck-Institut für Chemische Energiekonversion (MPI-CEC), Stiftstrasse 34-36, D-45470 Mülheim a.d. Ruhr, Germany
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
| | - Walid Baaziz
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 CNRS − Université de Strasbourg, 23 rue du Loess BP 43, 67034 Strasbourg cedex
2, France
| | - Elisa Borfecchia
- Department of Chemistry, INSTM Reference Center and NIS Centers, University of Torino, Via P. Giuria 7, 10125 Torino, Italy
| | - Luca Braglia
- CNR-IOM, TASC Laboratory, S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Spyridon Zafeiratos
- Institut de Chimie et Procédés pour l’Energie, l’Environnement et la Santé (ICPEES), ECPM, UMR 7515 CNRS − Université de Strasbourg, 25 rue Becquerel, 67087 Strasbourg Cedex 02, France
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Nyathi TM, Fischer N, York APE, Claeys M. Environment-Dependent Catalytic Performance and Phase Stability of Co 3O 4 in the Preferential Oxidation of Carbon Monoxide Studied In Situ. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02653] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thulani M. Nyathi
- Catalysis Institute and c*change (DSI-NRF Centre of Excellence in Catalysis), Department of Chemical Engineering, University of Cape Town, Rondebosch 7701, South Africa
| | - Nico Fischer
- Catalysis Institute and c*change (DSI-NRF Centre of Excellence in Catalysis), Department of Chemical Engineering, University of Cape Town, Rondebosch 7701, South Africa
| | - Andrew P. E. York
- Johnson Matthey Technology Centre, Sonning Common, Reading RG4 9NH, U.K
| | - Michael Claeys
- Catalysis Institute and c*change (DSI-NRF Centre of Excellence in Catalysis), Department of Chemical Engineering, University of Cape Town, Rondebosch 7701, South Africa
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Saddeler S, Hagemann U, Schulz S. Effect of the Size and Shape on the Electrocatalytic Activity of Co3O4 Nanoparticles in the Oxygen Evolution Reaction. Inorg Chem 2020; 59:10013-10024. [DOI: 10.1021/acs.inorgchem.0c01180] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S. Saddeler
- Faculty of Chemistry, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen, Universitätsstrasse 5−7, S07 S03 C30, D-45117 Essen, Germany
| | - U. Hagemann
- Interdisciplinary Center for Analytics on the Nanoscale (ICAN), NanoEnergieTechnikZentrum, Carl-Benz-Strasse 199, D-47057 Duisburg, Germany
| | - S. Schulz
- Faculty of Chemistry, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen, Universitätsstrasse 5−7, S07 S03 C30, D-45117 Essen, Germany
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Zheng J, Tang X, Zhang S, Huang T, Zheng H, Sun B. Relationship between the structure of chitosan-based flocculants and their performances in the treatment of model azo dyeing wastewater. CHEMOSPHERE 2020; 247:125920. [PMID: 31968285 DOI: 10.1016/j.chemosphere.2020.125920] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Revised: 01/09/2020] [Accepted: 01/13/2020] [Indexed: 06/10/2023]
Abstract
Chitosan-based flocculants are efficient and biodegradable, possessing the potential application in water treatment. A chitosan-based flocculant, CTS-g-PAM, was prepared via grafting copolymerization. Two main structures of CTS-g-PAM were detected by X-ray photoelectron spectroscopy (XPS), and they related to the different performances of CTS-g-PAM in the treatment of model azo dyeing wastewater in terms of removal efficiency, floc size and zeta potential. CTS-g-PAM with the optimal ratio of CN to -NH- owned the best performance. CN reinforced the interaction between CTS-g-PAM and azo dyes and charge neutralization while the flocs formed in the case were large and compacted. However, excessive CN accelerated itself hydrolysis and leaded to the decomposition of CTS-g-PAM, deteriorating the performance of the flocculant.
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Affiliation(s)
- Jie Zheng
- Chongqing Key Laboratory of Catalysis & Functional Organic Molecules, College of Environment and Resources, Chongqing Technology and Business University, Chongqing, 400067, PR China
| | - Xiaomin Tang
- Chongqing Key Laboratory of Catalysis & Functional Organic Molecules, College of Environment and Resources, Chongqing Technology and Business University, Chongqing, 400067, PR China; Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, PR China.
| | - Shixin Zhang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Ting Huang
- Chongqing Key Laboratory of Catalysis & Functional Organic Molecules, College of Environment and Resources, Chongqing Technology and Business University, Chongqing, 400067, PR China
| | - Huaili Zheng
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing, 400045, PR China
| | - Bin Sun
- Chongqing Key Laboratory of Catalysis & Functional Organic Molecules, College of Environment and Resources, Chongqing Technology and Business University, Chongqing, 400067, PR China
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11
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Liu K, Zhao Y, Wang J, Xue Q, Zhao G. Ag–CoO nanocomposites for gas-phase oxidation of alcohols to aldehydes and ketones: intensified O 2 activation at Ag–CoO interfacial sites. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01613f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The fabrication of qualified catalysts is a key issue to implement gas-phase aerobic alcohol oxidation, but necessarily requires understanding the structures of catalytic active sites and the supply of active oxygen species.
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Affiliation(s)
- Kun Liu
- Institute of Optical Functional Materials for Biomedical Imaging
- School of Chemistry and Pharmaceutical Engineering
- Shandong First Medical University & Shandong Academy of Medical Sciences
- Taian
- China
| | - Yichen Zhao
- Institute of Optical Functional Materials for Biomedical Imaging
- School of Chemistry and Pharmaceutical Engineering
- Shandong First Medical University & Shandong Academy of Medical Sciences
- Taian
- China
| | - Jiale Wang
- Institute of Optical Functional Materials for Biomedical Imaging
- School of Chemistry and Pharmaceutical Engineering
- Shandong First Medical University & Shandong Academy of Medical Sciences
- Taian
- China
| | - Qingsong Xue
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai
- China
| | - Guofeng Zhao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai
- China
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