六氯苯在水相、冰相和有机相中的光化学转化  

Photoconversion of Hexachlorobenzene in Water,Ice and Organic Phase

作　　者：刘汉飞[1] 杨婷[1] 康春莉[1] 李林璘[1] 李哲[1] 刘佳[1] 陈柏言[1] 

机构地区：[1]吉林大学环境与资源学院,地下水资源与环境教育部重点实验室,长春130021

出　　处：《高等学校化学学报》2013年第8期1971-1978,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:41073063)资助

摘　　要：以低压汞灯为光源研究了六氯苯(HCB)在水相、冰相和有机溶剂中光转化的动力学过程,分析了反应产物,探讨了反应机理,考察了H2O2,NO2-,Fe2+对水相/冰相中HCB光转化的影响.结果表明,在低压汞灯照射下,HCB在3个体系中的光转化速率大小为有机相>水相>冰相;H2O2促进水相中HCB的光转化而抑制冰相中HCB的光转化;NO2-对HCB在水相/冰相中的光化学转化均起抑制作用;Fe2+对水相中HCB的光转化有促进作用,而对其在冰相中的光转化无影响;六氯苯在3个体系中光转化的机理均为逐级脱氯过程.The photoconversion kinetics of hexachlorobenzene（HCB） was studied under UV irradiation by using low-pressure mercury lamp as light source. The photoproducts were analyzed and on this basis the photoconversion mechanism was proposed. Also, the effects of H2O2, NO2^-, Fe^2＋ on the photoconversion in water/ice were investigated, respectively. The results show that the photoconversion rates of HCB in the three systems under the irradiation changed as follows： organic phase〉water〉ice; H2O2 promotes the photoconversion of HCB in water but inhibits it in ice; NO2^- has inhibition effect on the photoconversion of HCB both in water and in ice; Fe^2＋ promotes the photoconversion of HCB in water but has no effect in ice; the photoconversion mechanism of HCB is a step-by-step dechlorination process.

关 键 词：六氯苯 光转化 反应介质 动力学 反应机理 

分 类 号：O644.1[理学—物理化学] X131[理学—化学]