没食子酸强化Fenton体系对水中DEET降解的研究  

Degradation of DEET in water by gallic acid enhanced Fenton system

作　　者：李明慧[1] 王丹丹[1] 陈晓蕾 阎登科 李海松[1] LI Ming-hui;WANG Dan-dan;CHEN Xiao-lei;YAN Deng-ke;LI Hai-song(School of Ecology and Environment,Zhengzhou University,Zhengzhou 450000,China;Zhihe Environmental Protection Technology Co.,Ltd.,Zhengzhou 450000,China)

机构地区：[1]郑州大学生态与环境学院,河南郑州450000 [2]知和环保科技有限公司,河南郑州450000

出　　处：《现代化工》2024年第8期97-103,共7页Modern Chemical Industry

基　　金：河南省重大科技专项(201300311100);国家自然科学基金面上项目(52370088)。

摘　　要：针对Fenton反应过程中生成的Fe^(3+)的还原速率相对于Fe^(2+)和H_(2)O_(2)的反应速率较慢限制了其降解效率的问题,以N,N-二乙基-间甲苯酰胺(DEET)为目标污染物,比较了3种络合剂对Fenton反应的促进效应。结果表明,在DEET浓度为200μmol/L、H_(2)O_(2)/Fe^(2+)摩尔比为20∶1、初始Fe^(2+)浓度为50μmol/L、没食子酸(GA)/Fe^(2+)摩尔比为1∶1以及pH=7.0的条件下,DEET的去除效率在20 min内达到75.3%。与传统的Fenton体系相比,DEET的降解效率提高了63.8%。HO·是加速DEET降解和矿化的主要活性氧物质。GA促进了Fe^(3+)的还原和H_(2)O_(2)的分解,从而促进了额外自由基的生成,加速了Fe^(2+)/H_(2)O_(2)体系对DEET的降解。The reduction rate of Fe^(3+)generated in Fenton process is relatively slower than the reaction rate between Fe^(2+)and H_(2)O_(2),which limits the degradation efficiency of Fe^(3+).Taking N,N-diethyl-m-toluamide(DEET)as the target pollutant,the promoting effects of three complexing agents on Fenton reaction are compared.Studies show that the removal efficiency of DEET reaches 75.3%within 20 min under the conditions that DEET concentration is 200μmol·L^(-1),the molar ratio of H_(2)O_(2)/Fe^(2+)is 20∶1,the initial concentration of Fe^(2+)is 50μmol·L-1,the molar ratio of gallic acid/Fe^(2+)is 1∶1 and pH=7.0.Compared with the traditional Fenton system,the degradation efficiency of DEET is 63.8%higher.HO·is the main active oxygen species that accelerates DEET to degrade and mineralize.Gallic acid promotes the reduction of Fe^(3+)and the decomposition of H_(2)O_(2),thus promoting the generation of additional free radicals and accelerating the degradation of DEET in Fe^(2+)/H_(2)O_(2)system.

关 键 词：DEET Fe^(3+)/Fe^(2+)循环 类芬顿体系 没食子酸 废水处理 动力学 

分 类 号：X131[环境科学与工程—环境科学]