铁活化过硫酸钠降解土壤中的滴滴涕  

Iron-Activated Sodium Persulfate Degrades DDT in Soil

作　　者：孟越 孙丽娜[1] 马国峰[2] 季颖[1] Meng Yue;Sun Lina;Ma Guofeng;Ji Ying(College of Environlnental Engineering;College of Mechanical Engineering,Shenyang University,Shenyang 110044,China)

机构地区：[1]沈阳大学环境学院,辽宁沈阳110044 [2]沈阳大学机械工程学院,辽宁沈阳110044

出　　处：《沈阳大学学报（自然科学版）》2018年第4期273-278,共6页Journal of Shenyang University：Natural Science

基　　金：国家重点基础研究发展计划项目(2014CB441106);中国博士后基金资助项目(2016M601333)

摘　　要：以常见的滴滴涕作为目标污染物,采用Fe^0/Fe^(2+)活化过硫酸钠法氧化降解滴滴涕.利用成熟的测定方法对土壤中的滴滴涕含量进行测定,并探讨了不同因素对滴滴涕去除效率的影响,包括铁元素的存在方式、铁元素的投加量、添加柠檬酸等因素.结果表明,在pH为1.5,反应时间为24h,Na_2S_2O_8浓度为1.5mol·L-1时,在一定范围内,滴滴涕降解率随着Fe^0/Fe^(2+)投加量的增加而增加,当投加3mL浓度为0.625mol·L-1的Fe^0/0.125mol·L-1的Fe^(2+)时,其降解率达到最优,之后不再提高;当投加量相同时,Fe^(2+)活化过硫酸钠法对滴滴涕污染场地土壤的修复效果比Fe^0显著,浓度为0.125mol·L-1时,Fe^(2+)和Fe^0对DDT的降解率分别为84.5%和65.5%;在实验条件不变的情况下,加入柠檬酸对Fe^(2+)活化过硫酸钠降解滴滴涕有促进作用,在pH为1.5,反应时间为24h,Na_2S_2O_8浓度为1.5mol·L-1,柠檬酸浓度为0.2mol·L-1,Fe^(2+)浓度为0.125mol·L-1时,降解效率由84.5%提高至92.6%.Using the common DDT as the target pollutants, sodium persulfate oxidation method is activated to degrade DDT contaminated soil by Fe^0/Fe^2＋. The determination of DDT in soil is studied, and the effects of different factors on DDT removal efficiency are discussed, including the existing ways of iron, the dosage of iron and the addition of citric acid. The results show that, when the pH is 1. 5, the reaction time is 24 h, and the concentration of Na2S2O5 is 1.5 mol·L^-1 , in a certain range, the degradation rate of DDT increases with the increase of the dosage of Fe^0/Fe^2＋ ; when 3 mL0.625 mol·L^-1 Fe^0/0.125mol·L^-1 Fe^2＋ is added, the degradation rate reaches the best and no longer increase; when the dosage is the same, the effect of Fe^2＋ activated sodium persulfate oxidation method to remedy DDT contaminated soil is better than Fe^2＋ significantly; at a concentration of 0.125 mol·L^-1, the degradation rates of Fe^2＋ and FeO to DDT are 84.5% and 65.5%, respectively; in the experiment under the same conditions, adding citric acid will promote the role of Fe^2＋ activated persulfate degradation of DDT, when pH is 1.5 and the reaction time is 24 h, the concentration of Na2S2O8 is 1.5 mol·L^-1 concentration of Fe^2＋ is 0. 125 mol·L^-1 ,

关 键 词：污染场地 滴滴涕 化学修复 铁 过硫酸钠 

分 类 号：X53[环境科学与工程—环境工程]