| Fenton去除废水中甲基多巴的机制及动力学 |
| 摘要点击 2038 全文点击 2391 投稿时间：2007-05-10 修订日期：2007-07-11 |
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| 中文关键词 甲基多巴 Fenton 反应机制 动力学 |
| 英文关键词 Methyldopa Fenton mechanism kinetic |
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| 中文摘要 |
| 采用Fenton试剂处理甲基多巴废水的实验结果表明，Fenton试剂能有效地去除甲基多巴及其降解产物引起的COD.不同的Fe2+∶H2O2(摩尔比)下甲基多巴的Fenton反应机理有显著的差异，在高Fe2+∶H2O2（≥2）时，反应机制是H2O2促进Fe2+的絮凝作用；在中Fe2+∶H2O2（=1）时，反应机制是兼有氧化和絮凝沉淀作用；在低Fe2+∶H2O2（≤0.2）时，反应机制是氧化作用，包括Fe2+催化H2O2氧化和Fe4+aq高价水合铁直接络合去除.针对低Fe2+∶H2O2（≤0.2）时甲基多巴的Fenton反应机制，建立了相应的动力学模型.模型值与实验值吻合良好，误差<10%，说明该反应动力学模型能较好地描述甲基多巴的Fenton去除过程. |
| 英文摘要 |
| Methyldopa was selected to be degraded by Fenton's reagent in the experiment. The experimental results showed that it was feasible to the removal of Methyldopa and COD by Fenton's reagent. The mechanism of Methyldopa removal by Fenton's reagent was significantly different according to the Fe2+:H2O2 ratio. With high ratio of Fe2+∶H2O2(≥2), the Fenton reaction was coagulation enhanced by H2Ｏ2.With medium ratio of Fe2+∶H2Ｏ2（=1)，the Fenton reaction could be characterized into two specific systems:oxidation and coagulation.With low ratio of Fe2+∶H2O2(≤0.2), the Fenton reaction was oxidation, including H2O2 oxidation catalyzed by Fe2+ and degradation by a hydrated ferryl-complex Fe4+aq. With the analysis of the mechanism according to low ratio of Fe2+∶H2O2(≤0.2),a kinetics model was adopted to describe the reaction， and the rate equation could provide the evidence for the main reaction pathway, which was fitted very well with the experiment data for the relative error below 10%. It was showed that the kinetic models could primary describe the process of the removal of Methyldopa and COD by Fenton's reagent. |
