%0 Journal Article
%J Applied Catalysis B: Environmental
%D 2023
%T Switching the reaction mechanisms and pollutant degradation routes through active center size-dependent Fenton-like catalysis
%A Xinhao Wang
%A Zhaokun Xiong
%A Hongle Shi
%A Zelin Wu
%A Bingkun Huang
%A Heng Zhang
%A Peng Zhou
%A Zhicheng Pan
%A Liu, Wen
%A Bo Lai
%K Degradation routes
%K Peroxymonosulfate
%K Reaction mechanism
%K Single atom catalyst
%K Size-dependent catalysis
%X Rationally regulating reaction mechanisms in Fenton-like reactions by tuning the properties of catalysts is of great significance, but still challenging. Herein, we synthesized various active center size-dependent catalysts to realize the switching of reaction mechanisms and pollutant degradation routes in peroxymonosulfate (PMS) activation systems. The results illustrated that the reaction mechanism transformed from radical oxidation (51.64%) to nonradical oxidation (89.92%) with the decrease of active center size from nanoparticle (CoNP-NC) to single atom (CoSA-NC). The evolution of reactive species switched the degradation intermediates and pathway of sulfisoxazole (SIZ). The generation of singlet oxygen (1O2) in CoSA-NC/PMS tends to selectively attack electron-rich site of SIZ, while reaction between radicals and SIZ prefers non-selective oxidation in CoNP-NC/PMS system. Besides, the toxicity tests indicated that the conversion from non-selective to selective oxidation resulted in lower toxicity of effluent after reaction, which can further reduce environmental risks of effluent.
%B Applied Catalysis B: Environmental
%V 329
%P 122569
%G eng
%U http://www.sciencedirect.com/science/article/pii/S0926337323002126
%R http://doi.org/10.1016/j.apcatb.2023.122569