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New insights into Sr-O bonds enhances Co/Fe catalytic activity in SrCoFe perovskite for boosted peroxymonosulfate activation

Dan Yu,Jiahong He,Taiping Xie,Qiang Xu,Quanxi Zhu,Jun Yang,Jibin An,Feng Ye,Jiankang Wang,Bin Xiang

It is of significant to explore activation mechanism of peroxymonosulfate (PMS) for development of more active and robust metal oxide catalyst. Here, we discover a key role of Sr-O bond in boosting the catalytic activity of SrCo 0.81 Fe 0.19 O 2.78 perovskite. In this catalytic system, oxygen vacancy, Fe 4+ /Fe 3+ , and Co 3+ /Co 2+ redox cycles synergistically enhanced catalytic activity of SrCo 0.81 Fe 0.19 O 2.78 for antibiotic degradation with 100 % Florfenicol (FF) removal in 27 min. Moreover, this catalyst presented excellent stability although oxygen vacancy had a decrease after reuse. The influential factors including coexisting anions on FF degradation were systematically studied. Comparative experiments and theoretical calculation indicate Sr-O ionic bond provides electrons for Co-O and Fe-O covalent bonds to accelerate Fe 4+ /Fe 3+ , and Co 3+ /Co 2+ redox cycles for PMS activation . Finally, the FF degradation pathway over SrCoFe perovskite/PMS system was identified by LC-MS/MS.