文献类型：期刊文献

英文题名：Self-Enhanced Oxidation of Fluoroquinolone Antibiotics by Cu2+/Peroxymonosulfate: Copper Coordination Mechanism with Antibiotics

作者：Zhao, Qing[1,2]; Chen, Long[1,2]; Wang, Zhiqiang[3]; Zhou, Lei[1,2,4]; Gong, Xueqing[3]; Xiu, Guangli[1,2,4]

机构：[1] Shanghai Environmental Protection Key Laboratory for Environmental Standard and Risk Management of Chemical Pollutants, School of Resources & Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] State Environmental Protection Key Lab of Environmental Risk Assessment and Control on Chemical Processes, School of Resources & Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; [3] State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Centre for Computational Chemistry, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China; [4] Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20240007829)

语种：英文

外文关键词：Animals - Antibiotics - Aquaculture - Coordination reactions - Electron spin resonance spectroscopy - Free radicals - Metabolites - Microorganisms - Oxidation - Paramagnetic resonance - Spectroscopic analysis

摘要：Trace amounts of copper have been reported to effectively promote peroxymonosulfate (PMS) induced degradation of several contaminants, while the underlying mechanism remains controversial in the transformation process of copper. Fluoroquinolone antibiotics (FQs) are a class of drugs applied to both humans and animals, widely used in animal husbandry, aquaculture and other farming industries since they have a wide antimicrobial spectrum and strong antimicrobial activity. However, FQs are not completely absorbed by receptors, and enter the environmental media through various pathways in the form of parent or metabolite. In this study, the existence of metallic copper promoted PMS induced FQs oxidation over a range of pH 5-9, and the promotion effect was highly related with copper-FQs complexation. Formation of highly reactive trivalent copper species (Cu3+) was proposed to be responsible for such promotion effect, which was further confirmed by quenching experiments, spectroscopic analyses and electron paramagnetic resonance (EPR) test. A stepwise copper reduction-oxidation mechanism was explored, herein Cu2+ was initially reduced to Cu+ with a relatively slow rate, which can be rapidly oxidize to Cu3+ by PMS. Results obtained in this study emphasize that the system undergoes the valence transition Cu2+/Cu+/Cu3+ rather than the free radical process. In particular, the promotion of copper in the system showed a significant positive correlation with the complexation ratio, further emphasizing the key role of the coordination of pollutants with Cu (II) in the oxidative transformation. ? 2023, The Authors. All rights reserved.