紫外/亚硫酸钠还原体系对2,4-二氯酚脱氯特性研究  

Dechlorination characteristics of 2,4-diclorophenol by UV/sodium sulfite reduction system

作　　者：陈晨 陈刚 程婷[2] 张晓[2,3] 邓琴 王磊 CHEN Chen;CHEN Gang;CHENG Ting;ZHANG Xiao;DENG Qin;WANG Lei(School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China;School of Environmental Ecology Science, Jiangsu City Vocational College, Nanjing 210036, China;Yancheng Environmental Technology and Research Institute, Nanjing University, Yancheng 224005, China)

机构地区：[1]江苏科技大学环境与化学工程学院,镇江212100 [2]江苏城市职业学院环境生态学院,南京210036 [3]南京大学盐城环保技术与工程研究院,盐城224005

出　　处：《江苏科技大学学报（自然科学版）》2021年第2期84-91,共8页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：2016江苏高校“青蓝工程”中青年学术带头人培养对象项目;江苏省高等学校自然科学研究面上项目(17KJD610001,17KJD610002);江苏城市职业学院校级科研平台资助项目;江苏城市职业学院“十三五”规划科研课题(17SSW-Z-Q-027);江苏省环境工程重点实验室科研开放基金资助项目(KF2015011)。

摘　　要：研究紫外/亚硫酸钠(UV/SO_(3)^(2-))还原体系对2,4-二氯酚(2,4-DCP)的脱氯效应,考察亚硫酸钠浓度、pH值、反应温度、电子捕获剂等对UV/SO_(3)^(2-)体系降解污染物的影响,探索污染物脱氯过程与脱氯机理.结果表明:UV/SO_(3)^(2-)体系可有效促进2,4-DCP的还原降解.随着亚硫酸钠浓度的升高,还原体系污染物降解效果明显增强,且准一级动力学方程可较好拟合还原体系对目标物的作用过程.UV/SO_(3)^(2-)体系对2,4-DCP降解效果随pH值增加而提高.随着反应温度上升,UV/SO_(3)^(2-)体系对目标物降解效果显著增强,准一级动力学速率常数与反应绝对温度关系较好符合Arrhenius方程.加入水合电子捕获剂可有效抑制2,4-DCP的降解,UV/SO_(3)^(2-)体系对2,4-DCP还原脱氯与氯离子生成量均较高,2,4-DCP在水合电子作用下脱氯中间产物为4-氯酚(4-CP)与苯酚.The dechlorination effect of 2,4-dichlorophenol(2,4-DCP)in UV/SO_(3)^(2-)system was investigated.The effect of different factors,dechlorination process of pollutant and dechlorination mechanism were examined in the UV/SO_(3)^(2-)system.The results showed that,UV/SO_(3)^(2-)reduction system could stimulate the degradation of 2,4-DCP significantly.The degradation effect of pollutant was enhanced with the increase of sodium sulfate concentration,and the quasi-first-order kinetic equation could better fit the reaction process.The degradation effect of 2,4-DCP in UV/SO_(3)^(2-)system was enhanced with the increase of pH.As the reaction temperature increases,the degradation effect of the target pollutant was increased obviously,and the relationship between the quasi-first-order kinetic rate constant and the reaction absolute temperature could better fit the Arrhenius equation.The reductive dechlorination of 2,4-DCP and the production of chloride ion was higher in UV/SO_(3)^(2-)system.In addition,the dechlorination intermediate product of 2,4-DCP was 4-chlorophenol(4-CP)and phenol under the action of hydration electrons.

关 键 词：卤代有机化合物 2 4-二氯酚 水合电子 UV/SO_(3)^(2-)体系 

分 类 号：X13[环境科学与工程—环境科学]