Degradation behaviors of Nabumetone and its metabolite during UV/monochloramine process:Experimental and theoretical study

作     者：Xiang Tu Yunsong Bai Qing Fu Sheng Chang Kunfeng Zhang Yang Pan Ruiyang Xiao Yifu Fu Qi Zhang Xiang Tu;Yunsong Bai;Qing Fu;Sheng Chang;Kunfeng Zhang;Yang Pan;Ruiyang Xiao;Yifu Fu;Qi Zhang

作者机构：State Key Laboratory of Environmental Criteria and Risk AssessmentState Environmental Protection Key Laboratory of Drinking Water Source ProtectionResearch Centre of Lake EnvironmentNational Engineering Laboratory for Lake Pollution Control and Ecological RestorationChinese Research Academy of Environmental SciencesBeijing 100012China School of Environmental Science and EngineeringSuzhou University of Science and TechnologySuzhou 215009China Institute of Environmental EngineeringSchool of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China School of ForestryNortheast Forestry UniversityHarbin 150040China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2024年第142卷第8期

页      面：103-114页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 1002[医学-临床医学] 1001[医学-基础医学(可授医学、理学学位)] 07[理学] 08[工学] 09[农学] 0903[农学-农业资源与环境] 0703[理学-化学] 0702[理学-物理学] 0713[理学-生态学] 

基　　金：supported by the Budget Surplus of Central Financial Science and Technology Plan(No.2021-JY-31) the National Key Research and Development Program of China(No.2021YFC3200804-02) the Open Research Fund of State Environmental Protection Key Laboratory of Drinking Water Source Protection,Chinese Research Academy of Environmental Sciences(No.2022YYSYKFZD01) the Fundamental Research Funds for the Central Public-interest Scientific Institution(No.2022YSKY-01) 

主　　题：UV/NH_(2)Cl Reactive species Degradation kinetics Reaction mechanism Degradation products 

摘      要：This study investigated degradation behaviors of a nonsteroidal anti-inflammatory drug Nabumetone(NMT)and its major metabolite 6-methoxy-2-naphthylacetic acid(MNA)in the coupling process of ultraviolet and monochloramine(UV/NH2Cl).The second-order rate constants of the contaminants reacting with reactive radicals(HO·,Cl·,Cl_(2)·-,and CO_(3)·^(-))were determined by laser flash photolysis ***·and Cl·contributed predominantly with 52.3%and 21.7%for NMT degradation and 60.8%and 22.3%for MNA *** presence of chlorides retarded the degradation of NMT,while promoted the destruction of MNA,which was ascribed to the photosensitization effects of MNA under UV *** functional theory(DFT)calculations revealed that radical adduct formation(RAF)was dominant pathway for both HO·and Cl·reacting with the contaminants,and hydrogen atom transfer(HAT)preferred to occur on side chains of NMT and *** reacted with NO_(2)·through single electron transfer(SET)with the second-order rate constant calculated to be 5.35×10^(7)(mol/L)^(-1)sec^(-1),and the contribution of NO_(2)·was predicted to be 13.0%of the total rate constant of NMT in pure water,which indicated that NO_(2)·played a nonnegligible role in the degradation of *** acute toxicity and developmental toxicity of NMT were enhanced after UV/NH_(2)Cl treatment,while those of MNA were *** transformation products of both NMT and MNA exhibited higher mutagenicity than their parent *** study provides a deep understanding of the mechanism of radical degradation of NMT and MNA in the treatment of UV/NH2Cl.