UV/H_2O_2光化降解水中邻二氯苯的反应机理

The reaction mechanism of catalytic degrading ortho-dichlorobenzene in water by UV/H_2O_2.

通过UV/H2O2光化高级氧化法,对水中邻二氯苯的降解途径及机理,降解反应的影响参数进行了系统的研究.结果表明,光化降解邻二氯苯的反应迅速,弱酸性或中性环境较有利于降解反应的进行,H2O2的投入量在特定的条件下具有一个最佳值.采用离子色谱(IC)、GC/MS等方法鉴定出邻二氯苯降解的中间产物主要为2,3-二氯苯酚、3,4-二氯苯酚、2-氯苯酚、甲酸、乙酸、乙二酸等.依此推导出了邻二氯苯的UV/H2O2光化降解的途径和机理.

Through UV/H2O2 photo-catalytic advanced oxidation technique, the pathway and mechanism of ortho-dichlorobenzene (O-DCB) in water and the effects parameters of the degrading reaction were studied systematically. The reaction of photo catalytic degradation of O-DCB was fast, and weak acidic or neutral environment was favorable to the degradation reaction. Input amount of H2O2 possessed the best value under specified condition. The intermediates of O-DCB were identified 2,3-dichlorophenol, 3,4-dichlorophenol, 2-chlorophenol, formic acid, acetic acid and oxalic acid mainly. According to this, adopting GC/MS and ion chromatogram (IC) techniques, the pathway and mechanism of UV/H2O2 photo catalytic degradation of O-DCB were deduced and led.