Photocatalytic degradation of sulfadiazine in suspensions of TiO_(2)nanosheets with exposed(001)facets  

作　　者：Xiaofan Xiang Laiyan Wu Junjiang Zhu Jiazhou Li Xi Liao Hongcheng Huang Jiajie Fan Kangle Lv 

机构地区：[1]Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission,College of Resources and Environmental Science,South-Central University for Nationalities,Wuhan 430074,China [2]Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing&Finishing,College of Chemistry and Chemical Engineering,Wuhan Textile University,Wuhan 430200,China [3]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Chinese Chemical Letters》2021年第10期3215-3220,共6页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51672312 and 21976141);the Fundamental Research Funds for the Central Universities:South-Central University for Nationalities(Nos.CZY17016 and CZZ21012);Environmental Pollution and Prevention(Team-Construction Project,No.KTZ20043);Undergradate Training Program for Innovation and Entrepreneurship for South-Central University for Nationalities(No.XCX2054)。

摘　　要：Antibiotics such as sulfonamides are widely used in agriculture as growth promoters and medicine in treatment of infectious diseases.However,the release of these antibiotics has caused serious environmental problems.In this paper,photocatalytic oxidation technology was used to degrade sulfadiazine(SDZ),one of the typical sulfonamides antibiotics,in UV illuminated TiO_(2)suspensions.It was found that TiO_(2)nanosheets(TiO_(2)-NSs)with exposed(001)facets exhibit much higher photoreactivity towards SDZ degradation compared to TiO_(2)nanoparticles(TiO_(2)-NPs)with a rate constant increases from0.017 min^(-1)to 0.035 min^(-1),improving by a factor of 2.1.Under the attacking of reactive oxygen species(ROSs)such as superoxide radicals(*O_(2)^(-))and hydroxyl radicals(*OH),SDZ was steady degraded on the surface of TiO_(2)-NSs.Based on the identification of the produced intermediates by LC–MS/MS,possible degradation pathways of SDZ,which include desulfonation,oxidation and cleavage,were put forwards.After UV irradiation for 4 h,nearly 90%of the total organic carbon(TOC)can be removed in suspensions of TiO_(2)-NSs,indicating the mineralization of SDZ.TiO_(2)-NSs also exhibits excellent stability in photocatalytic degradation of SDZ in wide range of pH.Even after recycling used for 7 times,more than 91.3%of the SDZ can be efficiently removed,indicating that they are promising to be practically used in treatment of wastewater containing antibiotics.

关 键 词：SULFADIAZINE Antibiotics Photocatalytic degradation TiO_(2)nanosheets Degradation pathway 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]