Fenton试剂对亚甲基蓝氧化褪色的反应动力学实验研究

为了提高Fenton试剂处理有机污染物的效率,探索最佳处理条件,以亚甲基蓝溶液为模型污水,进行了Fenton试剂氧化亚甲基蓝褪色反应的影响因素实验。对不同条件下的时间过程进行了在线动力学跟踪、拟合和比较。研究发现:Fenton试剂高级氧化的反应动力学过程可分为三阶段。反应前期符合一级动力学,后期符合二级动力学,两者之间存在一个过渡性阶段。一级动力学期的反应速度快,氧化能力高,对于污染物的化学处理是比较合理的,实验还确认了反应前期的Fe(II)浓度对过程的支配作用。

The Study of Fenton Reagent Oxidation and Reaction Kinetics of Methylene Blue

For the purpose of process improvement and operation condition optimization, methylene Blue solutions were prepared as model environmental liquid, a series of Fenton Oxidation experiments on several factors were investigated. By the on-line time monitoring of reaction process, their dynamic characteristic parameters were examined and compared. Results showed that, its probably can be divided three regions for the Fenton Oxidation process according to the kinetic order's identification based on the time series data. In the first region, it behaves a typical first-order reaction, but in the third region, another different behavior can be clearly recognized as second-order reaction, between these two extremes existing a transitional region namely second region. The first region's oxidation reactions are faster and more efficient to be recommended for application. Further finding was the fact that during the first region Fe(II) played a pronounced effect in the Fenton reactions.