Activation of peroxydisulfate by iron dichloride with hydroxylamine promoted sulfapyridine degradation  

作　　者：Pengcheng Yao Wei Wang Hui Wu Ziming Wang Yawei Xie Jinjuan Zhang Qiannan Jin Aiju You 

机构地区：[1]Zhejiang Institute of Hydraulics and Estuary(Zhejiang Institute of Marine Planning and Design),Hangzhou,Zhejiang,310000,China [2]College of Civil Engineering,Zhejiang University of Technology,Hangzhou,Zhejiang,310014,China

出　　处：《Emerging Contaminants》2024年第4期145-152,共8页新兴污染物(英文)

基　　金：supported by the China Postdoctoral Science Foundation(No.2023M733167);the National Natural Science Foundation of China(No.52170093);by the Zhejiang Provincial Natural Science Foundation(No.LY22E080010);the Science and Technology Project of Zhejiang Province(No.2022C02038);the Basic Public Welfare Research Program of Zhejiang Province(LZJWZ22C030002);the Joint Funds of the Zhejiang Provincial Natural Science Foundation of China(LZJWZ23E090007);the Science Foundation of President of the Zhejiang Institute of Hy-draulics and Estuary(ZIHE 22Q009);the Zhejiang Province Science and Technology Plan Project(RC2223,RC2224).

摘　　要：Sulfapyridine(SPY)is a ubiquitous environmental contaminant belonging to the sulfonamide antibiotics.Previous studies showed that hydroxylamine(HA)can improve the performance of advanced oxidation processes(AOPs)by promoting Fe(Ⅱ)regeneration,yet the reaction mechanisms were not elucidated.Therefore,the role of HA and the degradation mechanisms of SPY were systematically studied therein.The SPY degradation efficiency increased from 77.5%to 91.6%after HA was added.With radical scav-enger experiment,a function of HA to promote·OH production for SPY degradation was clarified.The major radical from SO_(4)^(·-) and·OH to·OH with addition of HA in Fe(Ⅱ)/potassium peroxydisulfate(PDS).Results showed that alkali,acid condition and high PDS concentration all contributed to SPY degradation.According to experimental results,density functional theory(DFT)was used to calculate the degradation pathway of SPY.Rate-limiting path was obtained by comparing the rate constants calculated from the transition-state theory.The cleavage of CeC bond in benzene ring with the slowest rate was essential to degrade SPY,which not only promotes the mineralization of SPY,but also prevent the production of toxic TPs effectively.This study provides valuable insight into the SPY degradation in HA/Fe(Ⅱ)/PDS.

关 键 词：SULFAPYRIDINE HYDROXYLAMINE Degradation pathway Potassium peroxydisulfate Advanced oxidation processes 

分 类 号：O62[理学—有机化学]