Fenton氧化法降解甲基橙溶液的研究

Study on Degradation of Methyl Orange by Fenton Reagent Oxidation

采用Fenton氧化法降解甲基橙溶液.结果表明,H2O2浓度决定甲基橙的去除率,铁离子浓度是影响降解速率的主导因素,而随pH值降低反应速率明显增大.在UV紫外光条件下,能更好的使降解甲基橙溶液脱色,证明UV紫外光是控制光催化氧化反应速率的重要因素.通过设计正交试验,考察不同Fe2+浓度、光照、pH值以及H2O2浓度对降解效果的影响.结果表明,影响处理效果各因素的重要性大小顺序为:pH值,Fe2+浓度,H2O2浓度,降解时间.在甲基橙降解过程中pH值不断下降,反应终止时pH为2.74.初始pH为3.0时处理效果最好,过大或过小均对反应不利.在甲基橙降解的最佳条件下,甲基橙的降解遵循一级反应动力学.

In an experiment reported in this paper,methyl orange was degraded by means of Fenton reagent oxidation.The results showed that the concentrations of H2O2 determined the removal rate of methyl orange and Fe2＋ concentration was the leading factor for the degradation rate.The rate of the degradation reaction increased with decreasing pH value.Under the condition of UV-light,the methyl orange was better decolorated,suggesting that UV-light is a significant factor for controlling the rate of photocatalytic oxidation.In an orthogonal test,the effects of Fe^2＋ concentration,light,pH and H2O2 concentration were investigated and the significance of these factors was shown to be in the order of pH value Fe^2＋ concentration H2O2 concentration degradation time.In the process of degradation of methyl orange,pH value steadily decreased and the reaction terminated at a pH of 2.74.The best result of methyl orange degradation was obtained with an initial pH of about 3.0.Under the optimum condition of methyl orange degradation,the reaction followed the first order reaction kinetics.