光助Fenton氧化反应降解染料罗丹明B

Photo-Fenton Oxidation Processes Used in the Degradation of Rhodamine B

研究了不同光源条件下光助Fenton反应催化氧化降解有机染料罗丹明B脱色情况及相关机理。内容包括 :不同光源、初始反应溶液酸度、反应时间、Fenton试剂浓度、初始染料溶液浓度等因素对光助Fen ton反应的影响 ,确定了方法的优化条件 ,并讨论了光助Fenton反应的反应机理。研究表明 :在 pH =3 5的条件下 ,4 5 0W高压汞灯照射以及较强太阳光照射的条件均可以明显加快Fenton法催化氧化降解罗丹明B溶液的过程 ,色度脱除率可达到 99%以上 。

Photo-Fenton method, the combination of Fenton reagent with light, is an efficient method for waste water treatment. In this paper, the degradation of rhodamine B (a kind of organic dye) using this method was researched. Through numerous experiments, the influences of five parameters including light source, pH, reaction time, dosage of Fenton reagent, and initial dye concentration were investigated intensively. In this paper, the mechanisms of this reaction have also been probed. It is concluded from the experiments that the irradiations of 450 W high-pressure mercury lamp and sun light can both accelerate the process of degradation effectively. Under optimal conditions, the overall color removal was more than 99.9% within 45 min; COD can be removed effectively at the same time.