热活化过硫酸盐降解水体中毒死蜱  

Degradation of chlorpyrifos by thermo activated persulfate oxidation processes in water

作　　者：李旭伟[1,2,3] 张亚[1,2] 王国庆[1,2] 冯艳红[1,2] 郑丽萍[1,2] 龙涛[1,2] 林玉锁[1,2] 

机构地区：[1]环境保护部南京环境科学研究所,南京210042 [2]国家环境保护土壤环境管理与污染控制重点实验室,南京210042 [3]南京农业大学资源与环境科学学院,南京210095

出　　处：《环境化学》2016年第10期2089-2095,共7页Environmental Chemistry

基　　金：中央级公益性科研院所基本科研业务专项(20160308)资助~~

摘　　要：本文研究了热活化过硫酸盐降解水体中有机磷农药毒死蜱.考察了温度、过硫酸盐浓度、初始pH值、常见阴离子(CO_3^(2-)、HCO_3^-、Cl-和SO_4^(2-))对毒死蜱降解影响.结果表明,毒死蜱的降解符合准一级动力学,反应速率随过硫酸盐浓度的增加而增大,温度对毒死蜱降解速率的影响符合阿伦尼乌斯模型,pH值的改变对毒死蜱的降解没有显著影响.天然水体4种常见阴离子中,SO_4^(2-)对降解速率无显著影响,Cl^-对毒死蜱降解有促进作用,CO_3^(2-)和HCO_3^-抑制毒死蜱降解,且抑制程度为CO_3^(2-)>HCO_3^-.通过自由基淬灭实验验证了体系中·OH和SO_4^-·自由基的存在,且毒死蜱降解过程中·OH起主要作用.The degradation of chlorpyrifos, a typical organophosphorus pesticide, by thermos activated persulfate was systematically studied in this work. The influences of temperature,persulfate concentration,p H,and common anions（ i. e. CO3^2-,HCO3^-,Cl^-and SO4^2-） on the degradation of chlorpyrifos were investigated. The results indicated that the degradation of chlorpyrifos followed pseudo-first-order kinetics. The reaction rate increased with persulfate concentration. Temperature dependence of chlorpyrifos degradation rate fitted well with the Arrhenius model. The p H had no significant effect on the degradation of chlorpyrifos. As for the four common ions in natural water,SO4^2- had no effect on the degradation,Cl^-promoted the degradation of chlorpyrifos,while CO3^2- and HCO3^- inhibited the degradation and the degree of inhibition was CO3^2- 〉HCO3^-. Quenching experiment confirmed the presence of ·OH and SO4^-·in the system,and that·OH played a critical role on chlorpyrifos degradation.

关 键 词：过硫酸盐 毒死蜱 高级氧化技术 农药 

分 类 号：X592[环境科学与工程—环境工程]