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

李明慧 ¹王丹丹 ¹陈晓蕾 ²阎登科 ²李海松¹

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作者信息

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
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摘要

针对Fenton反应过程中生成的Fe3+的还原速率相对于Fe2+和H2O2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200 pmol/L、H2O2/Fe2+摩尔比为20∶1、初始Fe2+浓度为50 μmol/L、没食子酸(GA)/Fe2+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 Fe3+的还原和H2O2的分解,从而促进了额外自由基的生成,加速了 Fe2+/H2O2体系对DEET的降解.

Abstract

The reduction rate of Fe3+generated in Fenton process is relatively slower than the reaction rate between Fe2+and H2O2,which limits the degradation efficiency of Fe3+.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 200 μmol·L-1,the molar ratio of H2O2/Fe2+is 20∶1,the initial concentration of Fe2+is 50 µmol·L-1,the molar ratio of gallic acid/Fe2+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 Fe3+and the decomposition of H2O2,thus promoting the generation of additional free radicals and accelerating the degradation of DEET in Fe2+/H2O2 system.

关键词

DEET/Fe3+/Fe2+循环/类芬顿体系/没食子酸/废水处理/动力学

Key words

DEET/Fe3+/Fe2+recycle/Fenton-like/gallic acid/waste water treatment/kinetics

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基金项目

河南省重大科技专项(201300311100)

国家自然科学基金面上项目(52370088)

出版年

2024

现代化工

中国化工信息中心

现代化工

CSTPCDCSCD北大核心

影响因子：0.553

ISSN：0253-4320

参考文献量1

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