文献类型：期刊文献

英文题名：Cu(II) assisted peroxymonosulfate oxidation of sulfonamide antibiotics: The involvement of Cu(III)

作者：Zhao, Qing[1,2];Zhang, Xiao[1];Huang, Dezhi[1];Chen, Long[1];Li, Shuxin[1];Chovelon, Jean-Marc[3];Zhou, Lei[1,2,4];Xiu, Guangli[1,2,4]

机构：[1]East China Univ Sci & Technol, Shanghai Environm Protect Key Lab Environm Stand, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[3]Univ Claude Bernard Lyon 1, Univ Lyon, CNRS, IRCELYON, F-69626 Villeurbanne, France;[4]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2021

卷号：284

外文期刊名：CHEMOSPHERE

收录：;EI(收录号：20212610575370);WOS:【SCI-EXPANDED(收录号:WOS:000703682500008)】；

基金：The authors would gratefully acknowledge the finical support from National Natural Science Foundation of China (No. 21806037) . The authors would also like to thank Dr. Ting Wu from Research Center of Analysis and Test of East China University of Science and Technology for the technical support on HR-MS analysis.

语种：英文

外文关键词：Cu(II); Peroxymonosulfate; Sulfonamide Antibiotics; Cu(III)

摘要：Cu(II) is generally considered to be a poor activator for PMS decomposition, thus the potential impact of trace Cu (II) on PMS induced oxidation of typical pollutants is always overlooked. In this study, we reported that trace Cu (II) could significantly promote PMS induced degradation of four selected sulfonamide antibiotics (SAs), namely, sulfamehoxazole (SMX), sulfathiazole (STZ), sulfamerazine (SMZ), and sulfamonomethoxine (SMM). Different from conventional PMS-induced oxidation process, high-valent Cu(III) was ascertained as the primary reactive intermediate for SAs degradation, which was confirmed by raman tests and electron paramagnetic resonance (EPR). High concentrations of Cu(II) or PMS were beneficial to degradation of the selected contaminants. In PMS/Cu(II) oxidation system, all the selected SAs could undergo several different degradation pathways including continuous oxidation of aniline group, hydroxylation and S-N bond cleavage. In particular, for sixmembered SAs, such as SMZ and SMM, a SO2 extrusion pathway was also detected. The potential mechanism for Cu(III) formation was also proposed, which was believed to be highly related to the nature of the SAs. Hydroxylamine-SAs (N4-OH-SAs), generated from direct PMS oxidation of SAs, was deduced as the "promoter" for the whole oxidation process. And the generation of Cu(III) was likely to proceed through the interaction between PMS and Cu(I), which possibly derived from the reduction of Cu(II) by N4-OH-SAs. The results obtained in this study validated the contribution of Cu(III) to the elimination of pollutants and expanded our understanding of the oxidation process of PMS in the presence of trace amounts of Cu(II).