均相Fenton反应对偶氮染料橙黄G氧化脱色实验研究

Experimental Investigation of Oxidative Decolorization of Orange G Azo Dye in Aqueous Solution by Homogeneous Fenton Reaction

通过均相Fenton反应对偶氮染料橙黄G(简称为OG)废水溶液氧化脱色的实验研究,考察了废水中OG的初始质量浓度、二价铁离子和过氧化氢的投加量以及反应温度和初始pH值对OG脱色的影响.结果表明,均相Fenton法能够有效对OG废水溶液氧化脱色且该脱色反应遵循二级反应动力学方程.随着反应温度升高和pH适当降低,OG氧化脱色速率增强.若适当降低OG的初始质量浓度,OG氧化脱色率逐渐增大.在保证足够高脱色率的前提下,适当降低Fe2+离子的初始质量浓度,既实现OG脱色达标排放,又满足铁离子的排放限量规定.

Decolorization of azo dye Orange G（OG） in aqueous solution by homogeneous Fenton reaction was conducted.The effects of main parameters,including the initial concentration of OG,the dosages of ferrous ion and hydrogen peroxide（H2O2） along with the reaction temperature and the initial solution pH value,on the decolorization of the OG dye were investigated.The results showed that the homogenous Fenton process responsible for decolorizing OG in solution were effective and obeyed to second order kinetics with a good linear relationship（R20.989）.With increasing the reaction temperature and appropriately decreasing the initial solution pH,the OG decolorization rate was enhanced accordingly.If the initial concentration of OG was appropriately decreased,the initial concentration of ferrous ion may be decreased also in ensuring to keep the decolorization efficiencies of OG to meet the environmental standard for dyes such as OG discharge concerning the color and iron ion discharge limits.