PCDDs在氯仿溶液中的紫外光解  

ULTRAVIOLET PHOTOLYSIS OF POLYCHLORINATED DIBENZO-p-DIOXINS IN CHLOROFORM

作　　者：包志成[1] 郑明辉[1] 王克欧[1] 

机构地区：[1]中国科学院生态环境研究中心,北京100085

出　　处：《环境化学》1995年第3期190-195,共6页Environmental Chemistry

基　　金：国家自然科学基金资助项目

摘　　要：使用NDC-3型光化学反应仪、300W汞灯和15ml反应管,于43℃进行了2,3,7,8-TCDD,1,2,3,7,8-P_5CDD,1,2,3,4,7,8-HxCDD,l,2,3,4,6,7,8-HpCDD和OCDD在氯仿溶液中的紫外光解.其一级反应速率常测得值依次为0.54,0.29,0.15,0.15和0.19min^(-1),反应半衰期t_(1/2)均在5min以内.还原脱氯是主要的光解途径,并有大量低氯取代的PCDDs生成.初步研究表明,光降解在处理含PCDDs的工业废渣时可能是一种有效的方法.Ultraviolet photolysis of 2,3, 7,8-TCDD,1,2,3,7,8-PsCDD, 1,2,3,4,7,8-HxCDD, 1, 2,3,4,6,7,8 ,-HpCDD and OCDD were carried out in chloroform at 43℃ by using photochemical reactor, type NDC-3, a 300W UV light source and 15ml reaction vessel. Pseudo-first -order photolysis rate constants of 0. 54, 0. 29, 0.15, 0. 15 and 0. l9min-1 were measured for the five isomers respectively, and t1/2 values of all these compounds were less than 5min . It was found that reductive dechlorinadon was the major reaction pathway of photolytic degradation and significant amounts of less highly chlorinated dioxins were formed. Preliminary study suggests that photolysis processes may be an efficient technique to eliminate PCDD-contained industrial waste.

关 键 词：氯仿 紫外光解 PCDD$ 

分 类 号：X132[环境科学与工程—环境科学] X705