Identification and characterization of Fe_(3)O_(4)/peroxodisulfate advanced oxidation products from sulfameter  

作　　者：Jie Du Zhijun An Yufeng Hu Xianliang Yi Hao Zhou Jingjing Zhan Minghuo Wu 

机构地区：[1]School of Ocean Science and Technology,Dalian University of Technology,Panjin 124221,China

出　　处：《Journal of Environmental Sciences》2022年第12期227-235,共9页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.21607020,21876022,41977197)。

摘　　要：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 Fe_(3)O_(4)/peroxodisulfate(PDS)oxidation system after the optimization of PDS concentration and p H.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 compound,from which the oxidation products were never elucidated,to identify these intermediates/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 indicated 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,SO_(2)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.

关 键 词：Advanced oxidation SULFONAMIDES LC-HRMS/MS IDENTIFICATION Degradation products 

分 类 号：X832[环境科学与工程—环境工程]