文献类型：期刊文献

英文题名：Self-Enhanced Oxidation of Fluoroquinolone Antibiotics by Cuii/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：2024

外文期刊名：SSRN

收录：EI(收录号：20240160378)

语种：英文

外文关键词：Antibiotics - Degradation - Density functional theory - Design for testability - Electron spin resonance spectroscopy - Fluorescence spectroscopy - Metal ions - Paramagnetic resonance - Ultraviolet visible spectroscopy

摘要：Trace copper ions are commonly found in different water bodies. They can effectively promote the degradation of various pollutants by peroxymonosulfate (PMS). However, the underlying mechanism of copper's action has not yet been clarified. Fluoroquinolone antibiotics (FQs), which are commonly used in humans and animals, often coexisting with copper metal in environmental waters, especially in aquaculture and medical wastewater. The presence of CuII under neutral conditions is found to significantly enhance the degradation efficiency of FQs by PMS. The coordination of CuII with FQs plays a crucial role in this process. Taking pefloxacin (PE), one typical FQs as an example, the structure of the copper complexes was determined using UV-visible spectroscopy, fluorescence spectroscopy, and DFT calculations as [Cu (PE) (H2O)4]2+. Comprehensive quenching experiments and electron paramagnetic resonance (EPR) test indicated that high-valence copper was responsible for the accelerated degradation. The combined results, including PMS decay and DFT calculations, indicated that CuII is initially reduced to CuI at a relatively slow rate and then rapidly oxidized to CuIII in the presence of PMS. The results highlight the valence transition of CuII/CuI/CuIII experienced during PMS activation, and the crucial role of contaminant-metal coordination in the valence transformation of copper. ? 2024, The Authors. All rights reserved.