NO_2^-存在条件下冰相中对氯苯酚的光转化  

Photoconversion of p-Chlorophenol in Ice and the Presence of Nitrite

作　　者：康春莉[1] 高红杰[1] 郭平[1] 唐晓剑[1] 张歌珊[1] 刘星娟[1] 董德明[1] 

机构地区：[1]吉林大学环境与资源学院,长春130012

出　　处：《高等学校化学学报》2008年第4期705-709,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20577014)资助

摘　　要：以125W高压汞灯为光源,在低温(-12^-14℃)条件下研究了冰相中有亚硝酸盐存在时对氯苯酚(4-CP)的光转化反应.考察了各种因素对冰相中4-CP光转化的影响以及冰相中4-CP光转化的动力学和机理.实验结果表明,4-CP初始浓度、亚硝酸盐初始浓度、pH值和光强对冰相中4-CP光转化均有较大影响.在180min内,4-CP和总有机碳(TOC)的转化率分别达到80%和32%,在实验条件下,NO2-的存在能够改变4-CP在冰相中光转化的产物和机理.Environmental photochemistry of organic pollutants is an important research field, but the ice photochemistry of organic pollutants is still a unknown field and it is attracting more and more attention recently. The ice photochemistry of p-chlorophenol（4-CP）, as an important pollutant, is studied a little. In this paper, the UV lamp（125 W high-pressure mercury lamp） was lamp-house and the photoreaction of 4-CP in ice was the object of this research. Some influencing factors and the kinetics and mechanism of the photoconversion was investigated in the range of the temperature of - 12- - 14 ℃ in the presence of nitrite. According to the results, the initial concentration of the 4-CP, the initial concentration of the nitrite, a commen photoreaction reagent in environment, the initial pH and the intensity of the light had serious effects on the conversion of the 4-CP. The disposal rates of 4-CP and TOC in ice respectively reached 80% and 32% within 180 min. Four reaction products are characterized by MS-GC analysis, it is not completely the same as that reported by other researchers. On this basis the photoconversion mechanism of 4-CP is deduced. It is concluded that the mecha- nism and photoproducts of 4-CP photoconversion in ice would be changed because of the presence of NO2ˉ

关 键 词：对氯苯酚 亚硝酸盐 冰 光转化 机理 

分 类 号：X132[环境科学与工程—环境科学]