摘要
以高压汞灯为光源，ＴｉＯ２为催化剂，研究了水中低浓度六六六与五氯苯酚的光催化氧化。六六六易被光催化氧化，其４种异构体的半衰期十分接近，均在２０ｍｉｎ左右。ｐＨ中性条件下γ－六六六的氧化速率较高。六六六光催化氧化存在含氯中间产物，并可逐渐被氧化去除。五氯苯酚光催化氧化速率明显高于光分解。３０ｍｉｎ之内五氯苯酚即可完全脱氯。随反应过程的继续，三氯苯酚被氧化成简单的小分子直至完全矿化。该法在饮用水深度处理中有良好的应用前景。
Photocatalytic oxidation of low concentration of benzene hexachloride(BHC) and pentachlorophenol(PCP) in aqueous solution is studied with a high pressure mercury lamp as radiation resource and TiO2 as a catalyst.BHC can be oxidized easily,half life periods of the 4 isomers of BHC are all around 20 minutes.Oxidation rate of γ-BHC is higher under neutral condition.Chlorinated medium products formed in the photocatalytic oxidation of BHC can be gradually removed by further reaction.For PCP reaction rate of photocatalytic oxidation is much higher than that of photolysis.Dechlorination of PCP can be completed within 30 minutes.As the reaction process continues,PCP will be oxidized into simple small molecules and finally mineralized completely. It is predicable that photocatalytic oxidation has bright prospect in advanced treatment of drinking water.
出处
《环境科学》
CAS
CSSCI
CSCD
北大核心
1996年第1期24-26,共3页
Environmental Science
基金
国家自然科学基金
关键词
光催化氧化
六六六
五氯苯酚
photocatalytic oxidation, benzene hexachloride,pentachlorophenol,aqueous solution.
