摘要
采用电催化氧化方式降解水体中抗生素磺胺(sulfonamide,SA),考察SA初始浓度、溶液pH、电流强度、电解质种类和浓度对SA降解的影响,运用循环伏安法和水杨酸自由基捕获法研究电催化降解SA的作用机制,并通过LC-MS分析电催化SA的降解产物。结果表明:SA初始浓度0.12 mmol·L^(-1)、溶液pH为3.0、电流强度20 mA·cm^(-2)、电解质Na_(2)SO_(4)浓度为50 mmol·L^(-1)时,电催化氧化降解3 h后SA降解率为89.2%;电催化氧化降解SA的一级反应是直接氧化和间接氧化共同作用的过程,一部分SA分子在阳极表面通过电子转移直接氧化生成一级产物,另一部分SA分子与电解体系产生的·OH发生间接氧化,2种一级产物继续被·OH氧化,生成马来酸和富马酸。
Removal of sulfanilamide(SA)in aqueous by electro-catalytic oxidation was studied,and the influence factors of initial SA concentration,initial pH,current density,type and concentration of electrolytes on the SA degradation rate were investigated.The cyclic voltammetry and salicylic acid radical capture methods were used to reveal the mechanisms of electrical catalytic degradation of SA,and the degradation products of SA were analyzed by LC-MS.The results showed that the optimal reaction conditions were initial SA concentration 0.12 mmol·L^(-1),initial pH 3.0,current density 20 mA·cm^(-2),electrolyte 50 mmol·L^(-1)of Na_(2)SO_(4),and the degradation rate of SA could reach 89.6%within 3 h.The cyclic voltammetry tests and salicylic acid radical capture analyze suggested that the primary reaction of electro-catalytic degrade SA was the combination of direct oxidation and indirect oxidation processes.Most of the SA molecules could be directly oxidized to protonated product by electron transfer on the anode surface,other part of the SA molecules was indirectly oxidized with·OH produced by the electrolysis system.Two primary products were continuously oxidized by·OH,and eventually produced to maleic acid and fumaric acid.
作者
王慧晴
李燕
司友斌
吴康
周晨
YOUSAF Amina
WANG Huiqing;LI Yan;SI Youbin;WU Kang;ZHOU Chen;YOUSAF Amina(Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention,Sehool of Resources and Environmental,Anhui Agricultural University,Hefei 230036,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2018年第3期779-787,共9页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(41471405)
大学生创新创业训练计划资助项目(201610364026)
农田生态保育与污染防控安徽省重点实验室开放基金资助项目(FECPP201705)
关键词
磺胺抗生素
电化学降解
氧化降解
水处理
sulfonamide antibiotics
electrochemical degradation
oxidative degradation
water treatment
