电化学法生成Fenton试剂及其在工业染料废水降解脱色中的应用

Fenton reagent produced in electro-chemical cell and its using in degradation and decolorization of dye wastewater

以多孔石墨电极为阴极 ,电解时在阴极通以氧气或空气 ,电解生成的过氧化氢与阳极溶解的Fe2 +进行随后化学反应 ,现场生成羟基自由基 (Fenton试剂 ) ,进而对有机染整工业废水进行降解脱色反应。以可见光吸收谱图表征了工业染料废水经电解槽处理后吸光度的变化 ,以重铬酸钾法测试染料处理后的COD。实验结果表明 ,COD的去除率大于 80 % ,染料的脱色率达 1 0 0 % ,若将电解电流密度控制在 1 0mA/cm2 以下 ,槽电压可控制在 5V以内。实验结果表明 ,向阴极多孔石墨电极中通入空气与通入氧气的效果一致。

The electro-chemical processing to produce Fenton reagent has been described. Fenton reagent having a high redox potential has been used as an oxidant in treatment of dye wastewater. The results of visible spectrum show that the absorbency decreased fast in the first half hour, the dye will co-deposit with the Fe-dye complex and Fe(OH) 3 . If we control the electrolysis current densities below 10mA/cm 2, the electrolysis voltage will be controlled in 5V.