Fenton氧化降解对氯苯酚和2,4,6-三氯苯酚机理研究

Research on the Mechanism of Fenton Oxidation Degradation of P-chlorophenol and 2,4,6-trichlorophenol

选取持久性有机污染物对氯苯酚(4-CP)和2,4,6-三氯苯酚(2,4,6-TCP)作为目标污染物,开展Fenton氧化降解动力学研究,并对其脱卤机理和降解路径进行了探讨。结果表明:Fenton氧化降解4-CP和2,4,6-TCP过程符合拟一级反应动力学,4-CP在·OH的作用下发生脱氯和取代反应,生成对苯二酚和邻苯二酚,或是直接开环氧化为小分子的酸和醇;2,4,6-TCP的降解过程主要以脱氯为主,Cl-首先从苯环上脱离生成一氯酚和二氯酚,而后又进一步脱氯成为苯酚、1,4-二甲基苯等。

The persistent organic pollutants p-chlorophenol(4-CP)and 2,4,6-trichlorophenol(2,4,6-TCP)were selected as target pollutants,and the kinetics of Fenton oxidative degradation was carried out.The dehalogenation mechanism and degradation pathway were also discussed in this study.The results showed that the process of Fenton oxidative degradation of 4-CP and 2,4,6-TCP accorded with the pseudo first-order reaction kinetics.4-CP could undergo dechlorination and substitution reactions under the attack of·OH to generate hydroquinone and catechol,and could also be directly epoxidized into small-molecule acids and alcohols.The degradation of 2,4,6-TCP was mainly a dechlorination process.Cl-was first separated from the benzene ring to produce monochlorophenol and dichlorophenol,and then further dechlorinated to generate phenol and 1,4-dimethylbenzene.