UV/H2 O2光氧化降解水中邻二氯苯的研究

通过UV/H2O2氧化法,对水中邻二氯苯的降解动力学、降解反应的影响参数进行研究,结果表明,UV/H2O2氧化法能有效降解邻二氯苯,其反应符合准一级反应动力学规律;弱酸性或中性环境有利于降解反应的进行,H2O2的投入量在特定条件下具有一个最佳值通过IC,GC/MS鉴定出降解中间产物主要为2,3二氯苯酚、3,4二氯苯酚、甲酸、乙酸和乙二酸等,据此推导出邻二氯苯在UV/H2O2体系中的降解途径和机理

DEGRADATION OF ORTHO-DICHLOROBENZENE IN WATER BY H2O2 COMBINED WITH UV RADIATION

Photo oxidation of ortho dichlorobenzene( o DCB) in water by the UV/H 2O 2 advanced oxidation process was carried out in order to investigate the kinetics, pathway and mechanism of o DCB degradation. The experimental results showed that the photo catalysis degradation of o DCB accorded well with pseudo first order kinetics. The effects of different parameters, such as initial concentration of o DCB,pH value and H 2O 2 dosage on the degradation of o DCB have been investigated in detail. It was found that weak acidic or neutral conditions are more favo rable to the degradation of o DCB; some matters such as 2,3 dichlorophenol,3,4 dichloro phenol ,formic acid, asetic acid and oxalic acid were tentatively identified as the intermediates of o DCB degradation by GC/MS and IC.A degradation pathway was proposed to account for the observed intermediates produced during o DCB degradation by the UV/H 2O 2 process.