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.
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)
出处
《环境工程学报》
CAS
CSCD
北大核心
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)
