Sulfonamides(SAs)are one of the most widely used antibiotics and their residuals in the environment could cause some negative environmental issues.Advanced oxidation such as Fenton-like reaction has been widely applied in the treatment of SAs polluted water.Degradation rates of 95％-99.7％were achieved in this work for the tested 8 SAs,including sulfisomidine,sulfameter(SME),phthalylsulfathiazole,sulfamethoxypyridazine,sulfamonomethoxine,sulfisoxazole,sulfachloropyridazine,and sulfadimethoxine,in the Fe3O4/peroxodisulfate(PDS)oxidation system after the optimization of PDS concentration and pH.Meanwhile,it was found that a lot of unknown oxidation products were formed,which brought up the uncertainty of health risks to the environment,and the identification of these unknown products was critical.Therefore,SME was selected as the model com-pound,from which the oxidation products were never elucidated,to identify these interme-diates/products.With liquid chromatography-high resolution tandem mass spectrometry(LC-HRMS/MS),10 new products were identified,in which 2-amino-5-methoxypyrimidine(AMP)was confirmed by its standard.The investigation of the oxidation process of SME in-dicated that most of the products were not stable and the degradation pathways were very complicated as multiple reactions,such as oxidation of the amino group,SO2 extrusion,and potential cross-reaction occurred simultaneously.Though most of the products were not verified due to the lack of standards,our results could be helpful in the evaluation of the treatment performance of SAs containing wastewater.

Jie Du;Zhijun An;Yufeng Hu;Xianliang Yi;Hao Zhou;Jingjing Zhan;Minghuo Wu

School of Ocean Science and Technology,Dalian University of Technology,Panjin 124221,China

环境科学学报（英文版）

[1]Jie Du;Zhijun An;Yufeng Hu;Xianliang Yi;Hao Zhou;Jingjing Zhan;Minghuo Wu-.Identification and characterization of Fe3O4/peroxodisulfate advanced oxidation products from sulfameter)[J].环境科学学报（英文版）,2022(12):227-235

peroxodisulfate,sulfameter,Sulfonamides,sulfisomidine,phthalylsulfathiazole,sulfamethoxypyridazine,sulfamonomethoxine,sulfisoxazole,sulfachloropyridazine,sulfadimethoxine,methoxypyrimidine

Identification,characterization,Fe3O4,advanced,oxidation,products,from,SAs,are,one,most,widely,used,antibiotics,their,residuals,could,cause,some,negative,environmental,issues,Advanced,such,Fenton,like,has,been,applied,treatment,polluted,Degradation,rates,were,achieved,this,work,tested,including,SME,PDS,system,after,optimization,concentration,Meanwhile,found,that,lot,unknown,formed,which,brought,uncertainty,health,risks,identification,these,critical,Therefore,selected,model,pound,never,elucidated,identify,interme,diates,With,liquid,chromatography,high,resolution,tandem,mass,spectrometry,LC,HRMS,new,identified,amino,AMP,confirmed,by,its,investigation,process,dicated,not,stable,degradation,pathways,very,complicated,multiple,reactions,group,SO2,extrusion,potential,cross,occurred,simultaneously,Though,verified,due,lack,standards,our,results,helpful,evaluation,performance,containing,wastewater

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