Degradation of metoprolol by UV/sulfite as an advanced oxidation or reduction process:The significant role of oxygen  

作　　者：Ying Cao Juan Li Yanxin Zhao Yumeng Zhao Wei Qiu Suyan Pang Jin Jiang 

机构地区：[1]Advanced Interdisciplinary Institute of Environment and Ecology,Beijing Normal University at Zhuhai,Zhuhai 519087,China [2]State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin 150090,China [3]Key Laboratory of Songliao Aquatic Environment,Ministry of Education,School of Municipal and Environmental Engineering,Jilin Jianzhu University,Changchun 130118,China [4]Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education,Institute of Environmental and Ecological Engineering,Guangdong University of Technology,Guangzhou 510006,China [5]Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China

出　　处：《Journal of Environmental Sciences》2023年第6期107-116,共10页环境科学学报（英文版）

基　　金：This study was supported by the Guangdong introducing innovative and entrepreneurial teams(No.2019ZT08L213);the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(No.GML2019ZD0403);the National Natural Science Foundation of China(Nos.51979044 and 42177045);the Young Talent Project of Beijing Normal University at Zhuhai(No.310432101);We also thank the support received from China Scholarship Council(CSC)for providing a graduate fellowship to Y.C.(No.202006120356).

摘　　要：The degradation of metoprolol(MTP)by the UV/sulfite with oxygen as an advanced reduction process(ARP)and that without oxygen as an advanced oxidation process(AOP)was comparatively studied herein.The degradation of MTP by both processes followed the first-order rate law with comparable reaction rate constants of 1.50×10^(-3)sec^(−1)and 1.20×10^(-3)sec^(−1),respectively.Scavenging experiments demonstrated that both e^(−)_(aq)and H·played a crucial role in MTP degradation by the UV/sulfite as an ARP,while SO_(4)^(·−)was the dominant oxidant in the UV/sulfite AOP.The degradation kinetics of MTP by the UV/sulfite as an ARP and AOP shared a similar pH dependence with a minimum rate obtained around pH 8.The results could be well explained by the pH impacts on the MTP speciation and sulfite species.Totally six transformation products(TPs)were identified from MTP degradation by the UV/sulfite ARP,and two additional ones were detected in the UV/sulfite AOP.The benzene ring and ether groups of MTP were proposed as the major reactive sites for both processes based on molecular orbital calculations by density functional theory(DFT).The similar degradation products of MTP by the UV/sulfite process as an ARP and AOP indicated that e^(−)_(aq)/H·and SO_(4)^(·−)might share similar reaction mechanisms,primarily including hydroxylation,dealkylation,and H abstraction.The toxicity of MTP solution treated by the UV/sulfite AOP was calculated to be higher than that in the ARP by the Ecological Struc-ture Activity Relationships(ECOSAR)software,due to the accumulation of TPs with higher toxicity.

关 键 词：UV/sulfite Advanced reduction process(ARP) Advanced oxidation process(AOP) METOPROLOL Degradation products Toxicity 

分 类 号：TQ031[化学工程] X703[环境科学与工程—环境工程]