Insights into the electron transfer mechanisms of peroxydisulfate activation by modified metal-free acetylene black for degradation of sulfisoxazole  

作　　者：Chunxiu Yu Zelin Wu Hongle Shi Lingyun Gu Kexin Chen Chuan-Shu He Yang Liu Heng Zhang Peng Zhou Zhaokun Xiong Bo Lai 

机构地区：[1]State Key Laboratory of Hydraulics and Mountain River Engineering,College of Architecture and Environment,Sichuan University,Chengdu 610065,China [2]Sichuan Academy of Eco-Environmental Sciences,Chengdu 610041,China [3]Sino-German Centre for Water and Health Research,Sichuan University,Chengdu 610065,China

出　　处：《Chinese Chemical Letters》2024年第8期349-356,共8页中国化学快报（英文版）

基　　金：financial support from Sichuan Program of Science and Technology (Nos.2023NSFSC0344,2023JDZH0010);the National Natural Science Foundation of China (No.52200105);the National Key Research and Development Program of China (No.2021YFA1202500);the Analytical&Testing Center of Sichuan University for EPR detection

摘　　要：Herein,a modified metal-free acetylene black(MMF-AB)catalyst was synthesized by a simple solvothermal-calcination method and designed successfully to activate peroxodisulfate(PDS)for the degradation of sulfisoxazole(SIZ).Due to the doping of N,S and O metal-free elements,the modified catalyst showed excellent catalytic performance with 100%SIZ removal within 30 min.Pseudo first-order reaction rate constants(evaluating catalytic efficiencies and activity)of MMF-AB(kobs=0.105 min^(−1))was 3 times higher than pure-AB(k_(obs)=0.029 min^(−1)).Interestingly,it was demonstrated that the reaction sys-tem is based on the transfer of electrons from SIZ to PDS to realize an electron-transfer-based mechanism by the evidence of premixing,electron paramagnetic resonance(EPR)spectroscopy,salt-bridge experi-ments and electrochemical analyses.The introduction of recyclable filtration device solved the secondary pollution caused by the dispersion of the powdered catalyst in the treated water,which further proved the practicality and superiority of the MMF-AB catalyst.

关 键 词：PEROXYDISULFATE Sulfisoxazole Acetylene black ELECTROCHEMICAL Electron transfer 

分 类 号：O643.36[理学—物理化学] X703[理学—化学]