NO_3^-光催化脱色染料废水的研究

Photocatalytic decolorization of dyeing wastewater with NO_3^- under UV irradiation

染料工业废水在排放前必须加以处理。光催化在染料废水处理方面显示了巨大的应用优势。研究试验在NO3-存在下用紫外灯照射对甲基橙溶液进行光催化脱色。结果表明:随着NO3-含量的逐渐增加,甲基橙脱色率逐渐增加,在实验范围内没有出现NO3-加入量的最佳值;甲基橙在酸性条件下的脱色率高于碱性条件下的脱色率;当甲基橙质量浓度≤25mg/L时,光催化脱色反应为准一级反应;利用含NO3-废水在日光下对实际染料废水的脱色效果好,可以达到以废治废的目的。

It is crucial to control and treat the effluents of industrial dyeing wastewater before being discharged into the aquatic environment.Photocatalytic technology in the treatment of dyeing wastewater reveals strong advantages and capacious application foreground.NO3-has been used for decolorizing methyl orange（MO） solution under ultraviolet irradiation.The effect of some parameters on photocatalytic decolorization of methyl orange solution is investigated in detail.The results show that the decolorization rate of MO increases with the increase of NO3-dosage and no optimal value of NO3-dosage appears in the experimentation.The decolorization rate of MO under acidic conditions is better than that under alkaline conditions.The decolorization reaction is a pseudo first-order reaction when the concentration of MO is below 25 mg/L.The decolorization efficiency of actual dye wastewater by using the wastewater containing NO3-is good under sunlight radiation,reaching the goal of treating waste by using waste.