二氧化钛催化下的氯代二苯并-对-二恶英光解反应  

THE PHOTOLYSIS OF CHLORINATED DIBENZO-p-DIOXINS WITH TITANIUM DIOXIDE AS CATALYST

作　　者：张志军[1] 包志成[1] 王克欧[1] 郑明辉[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》1996年第1期47-51,共5页Environmental Chemistry

基　　金：国家自然科学基金资助项目

摘　　要：本文利用中压汞灯作光源,研究了氯代二苯并-对-二恶英(CDDs,包括CDD,DCDD,PeCDD和OCDD)在二氧化钛催化下的光解反应,并讨论了二氧化钛浓度、pH值、反应温度以及取代氯原子数目等对反应速率的影响.结果表明,二氧化钛能有效地催化CDDs的光降解,在室温下,4h内DCDD,PeCDD,OCDD分别降解了87.2%,84.6%,91.2%,反应温度和二氧化钛浓度是控制该反应的主要因素.Titanium dioxide was used to catalyze the photolysis of CDDs (CDD, DCDD, PeCDD and OCDD) in an aqueous system. The photolysis was carried out with a medium pressure mercury lamp. The degradation rate of CDDs was very high at the TiO2 concentration of 4g · 1-1. The highest rate of degradation was observed at higher temperature and lower chlorinated dioxin congeners. The results showed that DCDD,PeCDD,OCDD were destroyed by 87. 2%,84. 6%,91. 3% respectively within 4h at temperature of 30℃. This study has suggested that photocatalytic processes were an effective and inexpensive technique to remediate dioxin contamination.

关 键 词：氯化二苯并 二氧化钛 光降解 氯化二恶英 污水 

分 类 号：X703[环境科学与工程—环境工程]