【摘要】 以偶氮染料橙黄Ⅱ为对象,研究Fenton反应和紫外光辐射条件下,废水初始pH值、H₂O₂浓度、Fe²⁺浓度及反应物初始浓度对橙黄Ⅱ脱色效果的影响。结果表明,紫外光与Fenton试剂有明显协同作用,以紫外灯UV₂₅₄为光源,橙黄Ⅱ质量浓度20 mg/L、pH=3.0、H₂O₂浓度0.2 mmol/L、Fe²⁺浓度0.04 mmol/L、反应40 min条件下,橙黄Ⅱ的脱色率为95%,比传统Fenton试剂的脱色率提高了l5%。本研究为实际染料废水的治理提供了一种新方法。更多还原

【Abstract】 The present paper is aimed to introduce our study of the degradation of Orange Ⅱ by means of UV/Fenton. As is known, Orange Ⅱ is a kind of permanent and non-degradable dye while UV/ Fenton is a combination of Fenton reagent with UV light, which can be used as an efficient method for wastewater treatment. Therefore, we have investigated the effects of H₂O₂ concentration, Fe²⁺ concentration, pH value, and the initial concentration of Orange Ⅱ on the degradation of Orange Ⅱ in the process of UV/Fenton combined. The experimental results of our investigation show that a removal efficiency of Orange 11 tends to be as high as about 95% under the optimal condition with 20 mg/L of initial dye mass concentration during a period of 40 min reaction time. Furthermore, the removal efficiency of Orange 11 can be heightened by about 15% by way of UV/Fenton combination than by using Fenton alone. However, during the degradation experiments, the usage of H₂O₂ and Fe²⁺ need to be kept at proper concentrations. Otherwise, they would reduce the degradation efficiency. Besides,the initial pH value seems to have a great effect on the Orange Ⅱ removal efficiency during the process. Under the acidic condition, the degradation efficiency would be higher with the optimum condition of the degradation being H₂O₂0.2 mmol/L, Fe²⁺ 0.04 mmol/L and pH = 3. Further studies are likely to be focused on the preliminary mechanism about the degradation of Orange Ⅱ by UV/ Fenton. During the degradation process, COD_Cr can be removed effectively at the same time. According to the UV-Vis spectral analysis, Orange Ⅱ could be degraded into kinds of simple molecules.更多还原