Advanced oxidative degradation of sulfamethoxazole by using bowl-like FeCuS@Cu_(2)S@Fe^(0) catalyst to efficiently activate peroxymonosulfate  

作　　者：Xiaobo Wang Yu Zhou Sylvestre Ndayiragije Nan Wang Heqing Tang Lihua Zhu 

机构地区：[1]College of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]College of Chemistry and Chemical Engineering,Hubei Polytechnic University,Huangshi 435003,China [3]Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education,Hubei Province,College of Resources and Environmental Science,South-Central University for Nationalities,Wuhan 430074,China

出　　处：《Journal of Environmental Sciences》2023年第4期348-364,共17页环境科学学报（英文版）

基　　金：the funding supports from the National Natural Science Foundation of China (Nos. 22076052 and 21976063);China Postdoctoral Science Foundation (No. 2018M642850)。

摘　　要：A novel hierarchical bowl-like FeCuS@Cu_(2)S@Fe^(0)nanohybrid catalyst(B-FeCuS@Cu_(2)S@Fe^(0))was synthesized for removing sulfamethoxazole(SMX) through catalytic activation of peroxymonosulfate(PMS). It was found that this catalyst exhibited excellently high catalytic activity. Under optimized reaction conditions, all the added SMX(12 mg/L) could be completely degraded within 5 min. The SMX degradation followed pseudo first order kinetics with a rate constant k of 0.89 min^(-1), being 1.38, 4.51, 8.99 and 35.6 times greater than that of other catalysts including Fe^(0)(0.644 min^(-1)in the very initial stage), bowl-like iron-doped CuS(B-FeCuS, 0.197 min^(-1)), bowl-like CuS(B-CuS, 0.099 min^(-1)) and Cu_(2)O(0.025 min^(-1)), respectively. During the degradation, several reactive oxygen species(·OH, SO_(4)·-and1O_(2)) were generated with ·OH as the main one as confirmed by electron paramagnetic resonance analysis. The SMX degradation in the present system included both radical and non-radical mediated processes. A possible mechanistic insight of the PMS activation by bowl Fe^(0)decorated CuS@Cu_(2)S-based catalyst was proposed according to X-ray photoelectron spectroscopic(XPS) analysis, and the degradation pathway of SMX was speculated by monitoring the degradation intermediates with liquid chromatography coupled with mass spectrometry(LC-MS).

关 键 词：SULFAMETHOXAZOLE PEROXYMONOSULFATE Sulfide catalyst Degradation Reactive oxygen species 

分 类 号：X703[环境科学与工程—环境工程]