| 水中六氯苯的高级氧化降解机理及其动力学探讨 |
| 摘要点击 2030 全文点击 1018 投稿时间：2007-05-11 修订日期：2007-08-21 |
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| 中文关键词 六氯苯 UV/O3 降解 动力学 反应机理 |
| 英文关键词 hexachlorobenzen (HCB) UV/O３ degradation kinetics reaction mechanism |
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| 中文摘要 |
| 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.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.提高体系的初始 pH 值不利于O3、UV/O3对HCB的降解，酸性条件有利于降解反应的进行，在pH＝3，HCB=0.2 mg/L，反应40 min时，HCB的去除可达50%左右.O3单独作用以及UV/O3联合作用，对HCB的降解均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，这一规律就更为明显.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O3、UV/O3降解六氯苯的途径和机理. |
| 英文摘要 |
| 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. The experimental 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 UV＜O3＜UV/O3. But in the case of O3 and UV/O3, raising the initial pH value of the system could not raise the removal rate of HCB, and the removal efficiency of 0.2 mg/L HCB could reach 50% within 40 min when the initial pH value was equaled to 3 and the degradation velocity could be accelerated in the acidic solution. Whether in the cases of ozone action alone or UV/O3 combined action, the degradation of HCB satisfied basically 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. |
