电生成羟基自由基及其对染料降解脱色的研究

以电化学循环伏安法和红外光谱分析 (IR) ,研究了茜素红及酸性铬蓝在电解槽中处理前后的电化学行为的变化 ,进一步阐明Fenton试剂的作用机制。电解生成的过氧化氢与阳极溶解的Fe2+ 进行随后反应 ,生成羟基自由基 (Fenton试剂 ) ,进而对有机染料进行氧化反应 ,使其不饱和的—N＝N—双键断裂 ,分解成萘胺与氨基苯酚磺酸两个部分 ,从而达到有机染料降解、脱色的效果。测试结果表明 ,电解处理15min内 ,脱色率和COD_cr的去除率变化较大 ,电解处理 1h ,COD_cr的去除率达 80 % ,脱色率达 98%. 

Studies of Electro-Generated Hydroxyl Radical and Its Using in Degradation and Decolorization of Dyes

The electro\|chemistry behaviors of acid chrome blue and alizarin red in the electrolysis cell have been investigated by IR and cyclic voltammograph to explain the reaction system of Fenton reagent in this paper.Hydroxyl radical is formed in the cell by the following reaction between electro\|generated H\-2O\-2 and Fe\+\{2+\},which is dissolved from the anode.The electro\|generated Fenton reagent will oxide the organic dyes and break the N N double bond.IR result indicated that acid chrome blue is decomposed into two parts of naphthylamine and phenol\|aminobenzenesulfonate,then coprecipitated with Fe(OH)\-3.Both of the degradation and decolorization of dyes are efficient.Decolorization and COD\-\{Cr\} removing rate of dyes are decreased in the first 15 min in the cell.When the electrolysis was carried out for 1 h,the decolorization rate reaches 98% and the COD\-\{Cr\} removing rate approaches 80%.