原儿茶酸促进铁循环强化Fenton体系降解避蚊胺  

Ferrokinetics Promoted by Protocatechuic Acid and Enhanced Fenton System for DEET Degradation

作　　者：李昆峰 王丹丹[1] 李海松[1] 陈晓蕾 阎登科 许子聪 LI Kunfeng;WANG Dandan;LI Haisong;CHEN Xiaolei;YAN Dengke;XU Zicong(College of Ecology and Environment,Zhengzhou University,Zhengzhou 450001,China;Zhihe Environmental Protection Technology Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]郑州大学生态与环境学院,河南郑州450001 [2]知和环保科技有限公司,河南郑州450001

出　　处：《净水技术》2024年第10期115-124,共10页Water Purification Technology

基　　金：河南省重大科技专项:污水深度脱氮技术研发与产业化(201300311100)。

摘　　要：为了减少传统Fenton体系中Fe(Ⅱ)的投加量,提高H_(2)O_(2)的利用率,选择添加原儿茶酸(PCA)实现Fenton体系中的铁循环。以避蚊胺(DEET)为目标污染物,在最佳反应条件:c(DEET)0=0.2 mmol/L,c(H_(2)O_(2))=1.0 mmol/L,n(H_(2)O_(2))/n[Fe(Ⅱ)]=20∶1,n(PCA)/n[Fe(Ⅱ)]=1∶1,pH值=3.0下,DEET在20 min内降解率可达75%。对DEET降解过程中的总铁(TFe)和Fe(Ⅱ)浓度的变化进行记录,证明了PCA除了作为络合剂提高溶液中Fe离子的溶解度,也可作为还原剂促进体系中的Fe循环。利用叔丁醇(TBA)和对苯醌(PBQ)作为自由基淬灭剂鉴别反应体系中主要活性物质,得出PCA/Fe(Ⅱ)/H_(2)O_(2)体系中起主要氧化作用的是羟基自由基(·OH)。共存离子试验结果表明,SO^(2-)_(4)的存在对DEET的降解没有影响。对常见的污染物降解试验表明,Fe(Ⅱ)/PCA/H_(2)O_(2)体系普适性较好。In order to reduce the dosage of Fe(Ⅱ)in traditional Fenton system and improve the utilization rate of H_(2)O_(2),protocatechuic acid(PCA)was added to achieve iron cycle in Fenton system.With diethyltoluamide(DEET)as the target pollutant,under the optimal reaction conditions:c(DEET)0=0.2 mmol/L,c(H_(2)O_(2))=1.0 mmol/L,n(H_(2)O_(2))/n[Fe(Ⅱ)]=20∶1,n(PCA)/n[Fe(Ⅱ)]=1∶1,pH value=3.0,DEET degradation rate could reach 75%within 20 min.The changes of total iron(TFe)and Fe(Ⅱ)concentration during DEET degradation were recorded,which proved that PCA could be used as a reducing agent to promote ironcycle in the system besides improving the solubility of iron ions in the solution as a complex agent.Using tert-butanol(TBA)and p-benzoquinone(PBQ)as radical quenchers to identify the main active substances in the reaction system,it was concluded that hydroxyl radical(·OH)played the main oxidation role in Fe(Ⅱ)/PCA/H_(2)O_(2) system.The results of coexisting ion experiments showed that the presence of SO^(2-)_(4) had no effect on the degradation of DEET.For the degradation of common pollutants,PCA/Fe(Ⅱ)/H_(2)O_(2) system has good universality.

关 键 词：原儿茶酸 避蚊胺 FENTON 铁循环 络合剂 

分 类 号：X703[环境科学与工程—环境工程]