偶氮染料电化学氧化脱色动力学及其影响因素

Decoloration Kinetics of Electrochemical Oxidation of Azo Dye

以酸性红B作为模型污染物 ,研究了偶氮染料的电化学氧化脱色动力学 .考察了染料起始浓度、pH、电流密度及外加电解质 (Na2 SO4 /NaCl)对脱色过程的影响 .试验结果表明酸性红B电化学氧化脱色过程符合假一级动力学规律 ,反应物浓度对反应速率常数的影响为负一级 .酸性条件有利于酸性红B的迅速脱色 .采用NaCl作为外加电解质时 ,酸性红B的降解主要是氯离子的间接氧化作用 。

Reaction kinetics of electrochemical oxidation of Acid Red B (ARB) RuO 2-Ti anodes was discussed. The effect of initial concentration of dye stuff, pH, current density, and supporting electrolyte (Na 2SO 4/NaCl) was investigated. The decoloration rate is fast in acidic solution. With NaCl as supporting electrolyte the process is mediated by active chlorines generated by electrochemical oxidation of chloride ions as well as by direct electrochemical oxidation at the anode.