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环境化学

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

摘要：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.

Abstract：The decolouration of the dye Orange Ⅱ in the Fe(Ⅲ)/malate /H₂O₂ system under irradiation with visible light was systematically studied.We investigated the effect of different factors such as light source and pHas 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 the Fe(Ⅲ)/malate /H₂O₂ system under irradiation with visible light and that the Fe(Ⅲ)/malate/H₂O₂ system still strongly degrades organic pollutants even at an initial pHof 5.0.The decolouration efficiency of Orange Ⅱ in the combined Fe(Ⅲ)/malate/H₂O₂ system with the initial pHvalue of 5.0 is higher than that in the Fe(Ⅲ)/ H₂O₂ system or the Fe(Ⅲ)/malate system.The photoreaction follows a pseudo-first order kinetic law.The decolouration efficiency of Orange Ⅱ increases as light intensity increases.Sunlight is an effective visible light source for the Fe(Ⅲ)/malate/H₂O₂ system,so this system has the potential to be applied using sunlight.