摘要
采用典型的偶氮染料甲基橙配制模拟染料废水,通过单因素和正交试验,研究了模拟废水初始浓度、pH值、过氧化氢添加量和光照时间对脱色性能的影响,并对脱色过程进行了动力学拟合。研究结果表明,当甲基橙模拟废水质量浓度为20 mg/L,p H值为6.3,30%的过氧化氢添加体积为30μL、在20 W紫外灯照射下,光照反应180 min,甲基橙模拟废水的脱色率可达到100%,影响脱色效果最重要的因素为甲基橙模拟废水的初始浓度,脱色过程更符合一级反应动力学模型,脱色的机理主要基于光催化效应,在紫外光的照射下,过氧化氢分解产生氧化性更强的羟基自由基,使脱色效果显著增强。
The typical azo dye methyl orange was used to prepare the simulated dye wastewater. Through single factor and orthogonal test, the effects of the initial concentration, pH, the amount of hydrogen peroxide and the time of illumination of the simulated wastewater on the decolorization performance were studied, and the decolorization process was fitted with kinetics. The results show that when the concentration of methyl orange simulated wastewater is 20 mg/L, pH is 6.3, 30%hydrogen peroxide is 30 μL, under the irradiation of 20 W ultraviolet lamp, the decolorization rate of methyl orange simulated wastewater can reach 100% after 180 min of light reaction. The most important factor affecting the decolorization effect is the initial concentration of methyl orange simulated wastewater, and the decolorization process is more in line with the first-order reaction kinetic model.The mechanism is mainly based on the photocatalysis effect. Under the irradiation of ultraviolet light, hydrogen peroxide decomposes to produce hydroxyl radicals with stronger oxidation, which significantly enhance the decolorization effect.
作者
李秀玲
邓丽霞
黄静梅
辛磊
LI Xiu-ling;DENG Li-xia;HUANG Jing-mei;XIN Lei(College of Chemical and Biological Engineering Hechi University,Yizhou 546300,China)
出处
《环境科技》
2020年第5期35-39,43,共6页
Environmental Science and Technology
基金
2019年自治区级大学生创新创业训练计划立项项目(2019-10605092)。
关键词
甲基橙
过氧化氢
光催化
Methyl orange
Hydrogen peroxide
Photocatalytic decolorization
