UV、O_3及其组合UV/O_3降解六氯苯(HCB)的试验研究  

Degradation of hexachlorbenzene by UV,O_3 and UV/O_3 hybrid processes

作　　者：魏东洋[1] 刘芬[2] 于涛[3] 刘广立[4] 贾晓珊[4] 李杰[2] 

机构地区：[1]环境保护部华南环境科学研究所,广东广州510655 [2]兰州交通大学,甘肃兰州730070 [3]兰州理工大学,甘肃兰州730030 [4]中山大学环境科学与工程学院,广东广州510275

出　　处：《西安建筑科技大学学报（自然科学版）》2010年第5期723-728,756,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：中央级公益性科研院所环保专项基金资助项目(206030201-2007H);广东省自然科学基金资助项目(845106550100718);中山大学重点资金资助项目(32000-3253282)

摘　　要：采用UV、O3、UV/O3高级氧化法对水中六氯苯(HCB)的降解效果及机理进行了研究,并对结果进行了比较.结果表明,UV本身对HCB的去除贡献率不大,HCB可被O3、UV/O3快速降解,即UV<O3<UV/O3;UV、O3、UV/O3工艺条件下,提高HCB的初始浓度、不利于HCB的降解,后两种工艺条件下酸性条件下有利于降解反应的进行;无论是UV或O3单独作用还是UV/O3联合作用,HCB的降解满足准一级反应动力学规律,如果体系的pH值基本保持恒定,这种规律就更为明显.根据离子色谱(IC)、GC、GC-MS对六氯苯降解中间产物进行了测定,探讨了UV、O3、UV/O3降解六氯苯的途径和机理.The degradation characteristics and rule of hexachlorobenzen （HCB） in water were studied and the results were compared by the advanced oxidation process UV,O3 and UV/O3.Results showed that UV itself did not contribute to the removal of HCB obviously and HCB could be quickly degraded by O3 and UV/O3,namely UVO3UV/O3.But in the case of UV,O3 and UV/O3,raising the initial HCB concentration of the system and pH value could not raise the removal rate of HCB,while the degradation velocity could be accelerated in the acidic solution.Whether in the cases of UV,ozone action alone or UV/O3 combined action,the degradation of HCB basically satisfied the rule of pseudo-first order reaction kinetics,and this rule was more remarkable if a constant pH value of the system was maintained.The degradation pathway and mechanism of HCB were discussed according to the measured results of the intermediated substances from the HCB degradation process by IC,GC and GC-MS.

关 键 词：六氯苯 UV/O_3 降解 动力学 反应机理 

分 类 号：X24[环境科学与工程—环境科学]