液相放电-电极催化对罗丹明B的脱色研究

放电系统中加入TiO2催化剂能更有效地利用等离子体中各种高能量而产生氧化性高的.OH。文章以Ti为阳极,在直流电压下产生弧光放电,研究了其作用于罗丹明B模拟的印染废水的脱色效率,得到最佳放电电压、电极没水深度、电解质Na2SO4浓度、初始pH、罗丹明B初始浓度值,脱色率>95%。通过与W、Al电极比较,发现Ti电极上形成的氧化膜能增强放电强度,且有催化作用,不同电压下脱色反应速率系数提高23.7%~149%。结果表明,Ti阳极上形成了液相放电-电极催化自然集成的体系,在废水处理中是有发展前景的技术。

Decolorization of Rhodamine B by Electrical Discharge in Liquid and Electrode Catalysis

This paper described an experiment on dyestuff decolorization by means of Ti anode electrical discharge in Rhodamine B solution,during which high energy plus catalyst generated a great number of ·OH that were of very strong oxidizability.The optimum condition for oxidation/decolorization was studied with respect to discharging DC voltage,depth of electrode into the solution,electrolyte concentration of Na2SO4,initial pH and initial concentration of Rhodamine B.It was found that a liquid discharge-electrode catalysis system was formed on Ti anode under DC voltage thus greatly enhance the decolorization reaction.