NZVI/Na_2S_2O_8/超声复合法降解污染土壤PCB-29  

Treatment of 2,4,5-trichlorobiphenyl in soil with nanometer zero-valent iron and Na_2S_2O_8 coupled with ultrasonic composite method

作　　者：刘建福 李青松 郭淑娟 LIU Jian-fu;LI Qing-song;GUO Shu-juan(Department of Environmental Science and Engineering,Xiamen University of Technology,Xiamen 361024,China;Key Laboratory of Environmental Biotechnology,Fujian Province University,Xiamen 361024,China)

机构地区：[1]厦门理工学院环境科学与工程学院,福建厦门361024 [2]环境生物技术福建省高等学校重点实验室,福建厦门361024

出　　处：《中国环境科学》2018年第7期2646-2651,共6页China Environmental Science

基　　金：国家自然科学基金资助项目(51008261)

摘　　要：多氯联苯(polychlorinated biphenyls,PCBs)是一类具有高毒性、难降解的有机化合物,为了研发土壤中多氯联苯(PCBs)污染物高效处理技术,本研究采用PCBs中的2,4,5-三氯联苯(PCB-29)作为研究对象,以纳米零价铁(NZVI)活化Na_2S_2O_8,再辅以超声氧化对土壤中PCB-29进行降解试验,结果表明,NZVI/Na_2S_2O_8/超声复合法对污染土壤中PCB-29具有很好的去除效果,降解反应时间为1h时,去除率最高可达86.37%;NZVI/Na_2S_2O_8/超声复合法对PCB-29最佳降解条件为土壤初始p H值为5.0,Na_2S_2O_8浓度为12mmol/L,Na_2S_2O_8/NZVI物质的量比1:1.Polychlorinated biphenyls(PCBs)are a group of highly toxic and bio-refractory organic compounds.In order to improve the treatment efficiency of PCBs in soil,2,4,5-trichlorobiphenyl(PCB-29)was chosen as a model pollutant in this study.The degradation experiments of PCB-29 were performed with nanometer zero-valent iron(NZVI)activation sodium persulfate,and coupled with ultrasonic oxidation.The results indicated that the PCB-29 removal rate was 86.37%in one hour by NZVI/Na2S2O8/ultrasonic composite treatment.The optimal degradation conditions of PCB-29with NZVI/Na2S2O8/ultrasonic composite method are soil initial pH 5.0,Na2S2O8 concentration 12mmol/L,the molar ratio of Na2S2O8/NZVI 1:1.

关 键 词：纳米零价铁 PCB-29 过硫酸钠 土壤污染 

分 类 号：X511[环境科学与工程—环境工程]