Fe(Ⅲ)/苹果酸/H_2O_2体系对有机物的光降解特性研究

系统研究了可见光照射下染料橙黄Ⅱ在Fe(Ⅲ)/苹果酸/H2O2体系中的脱色情况,考查了光源、pH值、Fe(Ⅲ)、苹果酸、H2O2及染料初始浓度等因素对橙黄Ⅱ脱色效率的影响.结果表明,Fe(Ⅲ)/苹果酸/H2O2体系在可见光照射下能有效实现橙黄Ⅱ的脱色,在pH为5.0的条件下仍然具有较强的降解有机物的能力.该体系对橙黄Ⅱ的脱色率高于Fe(Ⅲ)/H2O2体系或Fe(Ⅲ)/苹果酸体系,光反应符合表观一级反应动力学规律.随着光强的增加,橙黄Ⅱ的脱色率增大.太阳光是该体系的有效光源,本体系具有利用太阳光的潜力.

Characteristics of photodegradation of organic pollutants in the ferric/malate/H2O2 system

The decolouration of the dye Orange II in Fe(III)/malate/H2O2 system under the irradiation of visible light was systematically studied. Experiments were conducted to investigate the effect of different factors such as light source, pH value as well as the initial concentration of Fe (III), malic acid, H2O2 and Orange II on the efficiency of decolouration of Orange II. The results show that Orange II can be photo-degraded effectively in Fe(III)/malate/H2O2 system under the irradiation of visible light and that Fe(III)/malate/H2O2 system still has a stronger degradation ability on organic pollutants even in the environment that the initial pH value is 5.0. The decolouration efficiency of Orange II in Fe(III)/malate/H2O2 system with the initial pH value of 5.0 is higher than that in Fe(III)/H2O2 system or that in Fe(III)/malate system. Photoreaction follows a pseudo-first order kinetic law. The decolouration efficiency of Orange II increases as light intensity increases. Since sunlight is one of the effective light sources, it indicates that the Fe(III)/malate/H2O2 system has a potential of using sunlight.