[Photo-fenton oxidation processes used in the degradation of rhodamine B].

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.