邻氯苯酚废水的光助-Fenton氧化反应机理研究  

Mechanism of orthochlorophenol oxidation by photo-assi sted Fenton process

作　　者：徐新华[1] 鲁奕良[1] 汪大翚[1] 

机构地区：[1]浙江大学环境工程系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2003年第4期492-495,共4页Journal of Zhejiang University：Engineering Science

基　　金：国家教育部留学回国人员基金资助项目.

摘　　要：利用光助-Fenton高级氧化处理技术对氯酚废水进行了处理研究,结果显示,光助-Fenton氧化对氯酚废水有很好的去除效果,在1/4Qth理论投加量,处理90min,邻氯苯酚去除率可达90%以上,通过对反应中间产物的分析发现,氯离析过程要比邻氯苯酚的降解要慢,实验测得的氯离子只是假设邻氯苯酚氧化过程中氯离子全部释放量的一部分.所以可以认为邻氯苯酚与羟基自由基的反应过程中,氯离子不是直接从芳香环上释放,而是先开环形成含氯脂肪烃,再发生脱氯反应.Photochemical advanced oxidation process (AOPS) uti li zing the photo-assisted Fenton reaction for degradation of Orthochlorophenol wa stewater was studied in this work. The results showed that the photo-assisted F enton process produced good effect under acidic conduction. Up to 90% Orthochlor ophenol was removed after a 90 minutes reaction period with H2O2 of 25% CODC r. According to the observed intermediates, the dechlorination process was mu ch slower than the disappearance of Orthochlorophenol, because the measurable ch lo ride ion was only a fraction of the theoretical value calculated by assuming 100 % release of chloride ion after Orthochlorophenol disappeared. Chlorinated inter mediates were formed which were sequentially oxidised by hydroxyl radicals. In o ther words, chlorine atoms will not be released directly from the aromatic ring after hydroxylation. After the chlorinated aliphatic intermediates were formed c hlorine atoms will be released from them.

关 键 词：邻氯苯酚废水 废水处理 光助-Fenton高级氧化处理 反应机理 工业废水 氯离子 

分 类 号：X703[环境科学与工程—环境工程]