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dc.contributor.authorDuan, Xiaoguang
dc.contributor.authorSu, C.
dc.contributor.authorMiao, J.
dc.contributor.authorZhong, Y.
dc.contributor.authorShao, Zongping
dc.contributor.authorWang, Shaobin
dc.contributor.authorSun, H.
dc.date.accessioned2017-11-20T08:49:59Z
dc.date.available2017-11-20T08:49:59Z
dc.date.created2017-11-20T08:13:36Z
dc.date.issued2018
dc.identifier.citationDuan, X. and Su, C. and Miao, J. and Zhong, Y. and Shao, Z. and Wang, S. and Sun, H. 2018. Insights into perovskite-catalyzed peroxymonosulfate activation: Maneuverable cobalt sites for promoted evolution of sulfate radicals. Applied Catalysis B: Environmental. 220: pp. 626-634.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/57996
dc.identifier.doi10.1016/j.apcatb.2017.08.088
dc.description.abstract

© 2017 Elsevier B.V. Metal-based catalysis has significantly contributed to the chemical community especially in environmental science. However, the knowledge of cobalt-based perovskite for aqueous phase oxidation still remains equivocal and insufficient. In this study, we discovered that Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-d (BSCF) perovskite was exclusively effective for peroxymonosulfate (PMS) activation to produce free radicals, whereas the BSCF was inert to activate peroxydisulfate (PDS) and hydrogen peroxide. The BSCF/PMS exhibited superior performance to the benchmark Co 3 O 4 nanocrystals and other classical PMS activators such as a-MnO 2 and spinel CoFe 2 O 4 , meanwhile achieving an impressive stability with manipulated cobalt leaching in neutral and basic environment. In situ electron paramagnetic resonance (EPR) revealed the evolution of massive sulfate radicals (SO 4 [rad] - ) and hydroxyl radicals ([rad]OH) during the oxidation. A comprehensively comparative study of BSCF and Co 3 O 4 nanocrystals was performed, including electrochemical impedance spectroscopy (EIS) and cyclic voltammograms (CV) in PMS solution as well as hydrogen temperature-programmed reduction (H 2 -TPR) and oxygen temperature-programmed desorption (O 2 -TPD) tests. The results unveil that the cobalt-based perovskite, BSCF, exhibited a better electrical conductivity and redox potential than the spinel cobalt oxide to interact with PMS. More importantly, the oxygen vacancies and less-electronegativity A-site metals may secure cobalt sites with a lower valence state for donating electrons to PMS simultaneously for radical generation. This study advances the mechanism of cobalt-based heterogeneous catalysis in environmental remediation.

dc.publisherElsevier BV
dc.titleInsights into perovskite-catalyzed peroxymonosulfate activation: Maneuverable cobalt sites for promoted evolution of sulfate radicals
dc.typeJournal Article
dcterms.source.volume220
dcterms.source.startPage626
dcterms.source.endPage634
dcterms.source.issn0926-3373
dcterms.source.titleApplied Catalysis B: Environmental
curtin.departmentDepartment of Chemical Engineering
curtin.accessStatusFulltext not available


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