活化过硫酸钠氧化修复有机氯农药污染土壤  

Remediation of organochlorine pesticides-contaminated soils by activatal persulfate

作　　者：陈垚 张凤娥 董良飞 CHEN Yao ZHANG Fenge DONG Liangfei(School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China)

机构地区：[1]常州大学环境与安全工程学院,江苏常州213164

出　　处：《环境工程学报》2017年第10期5715-5721,共7页Chinese Journal of Environmental Engineering

基　　金：常州市国际科技合作计划项目(CZ20150015)

摘　　要：分别采用H_2O_2、Fe^(2+)、Fe^(2+)/H_2O_23种药剂活化过硫酸钠,组成复合氧化剂体系,用于降解土壤中的α-六六六,探究pH和不同氧化剂组合对α-六六六降解效果的影响。结果表明,Fe^(2+)/H_2O_2/Na_2S_2O_8较Fe^(2+)/Na_2S_2O_8及H_2O_2/Na_2S_2O_8组合体系对土壤中α-六六六的降解效果更好;当Fe^(2+)/H_2O_2/Na_2S_2O_8的摩尔比为2/10/10,pH为7时,α-六六六的降解率可达86.1%。以乙醇和硝基苯作为分子探针,利用分子探针竞争实验鉴定Fe^(2+)/H_2O_2/Na_2S_2O_8组合体系中产生的SO4·和·OH,发现该体系中同时存在SO·4·和·OH自由基。To investigate the degradation of α-HCH with combined oxidation system in soil,3 different oxidants of H_2O_2,Fe^2＋,Fe^2＋/H_2O_2 were used to activate persulfate.The effects of initial pH and the different combined oxidants on the degradation of α-HCH were studied.The result shows that Fe^2＋/H_2O_2/Na_2S_2O_8 system has the highest performance in α-HCH degradation,followed by Fe^2＋/Na_2S_2O_8 andH 2O2/Na_2S_2O_8.The degradation efficiency of α-HCH is reaching 86.13% within Fe^2＋/H_2O_2/Na_2S_2O_8 system with the molar ratio of 2/10/10 and the pH of 7.The sulfate and hydroxyl free radical were proved to exist simultaneously in the Fe^2＋/H_2O_2/Na_2S_2O_8 system by molecular probes test using ethanol and nitrobenzene.

关 键 词：活化过硫酸钠 过氧化氢 二价铁离子 α-六六六 土壤修复 

分 类 号：X53[环境科学与工程—环境工程]