【摘 要】
：
Metal-based perovskite oxides have contributed significantly to the advanced oxidation processes (AOPs)due to their diverse active sites and excellent compositional/structural flexibility.In this study,we spe-cially designed a perovskite oxide with abunda
【机 构】
：
School of Energy Science and Engineering,Nanjing Tech University,Nanjing 211816,China;School of Mech
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Metal-based perovskite oxides have contributed significantly to the advanced oxidation processes (AOPs)due to their diverse active sites and excellent compositional/structural flexibility.In this study,we spe-cially designed a perovskite oxide with abundant oxygen vacancies,SrCo0.8Fe0.2O3 (SCF),and firstly applied it as a catalyst in peroxymonosulfate (PMS) activation towards organic pollutants degradation.The result revealed that the prepared SCF catalyst exhibited excellent performance on organic com-pounds degradation.Besides,SCF showed much better activity than La0.5Sr0.5Co0.8Fe0.2O3 (LSCF) in terms of reaction rate and stability for the degradation of the organic compounds.Based on the analysis of scan-ning electron microscope,transmission electron microscope,X-ray diffraction,N2 adsorption-desorption,X-ray photoelectron spectroscopy and electron paramagnetic resonance,it was confirmed that the per-ovskite catalysts with high content of Sr doping at A-site could effectively create a defect-rich surface and optimize its physicochemical properties,which was responsible for the excellent heterogeneous cat-alytic activity of SCF.SCF can generate three highly active species:1O2,SO4-· and ·OH in PMS activation,revealing the degradation process of organic compounds was a coupled multiple active species in both rad-ical and nonradical pathway.Moreover,it was mainly in a radical pathway in the degradation through PMS activation on SCF and SO4-· radicals produced were the dominant species in SCF/PMS system.This study demonstrated that perovskite-type catalysts could enrich OVs efficiently by doping strategy and regulate the PMS activation towards sulfate radical-based AOPs.
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