废水中甲基橙的电化学降解

以FTO导电玻璃作为阳极、石墨电极作为阴极电解模拟甲基橙废水,优化了工艺条件,并对甲基橙的降解机理进行了初步探究。实验结果表明,在NaCl投加量5 g/L、电压8 V、废水pH 6、初始甲基橙质量浓度6.0 mg/L的优化条件下电解30 min,废水的脱色率达91.3%,COD降低了62%。机理研究结果表明,电解产生的羟基自由基与甲基橙发生氧化还原反应,破坏了甲基橙的显色基团,使其内部某些化学键发生断裂,从而达到脱色的目的。

The electrochemical degradation of methyl orange dye in wastewater

The simulated methyl orange wastewater was electrolyzed with FTO conductive glass as the anode and a graphite electrode as the cathode. The technological conditions were optimized,and the degradation mechanism of methyl orange was preliminarily discussed. The experimental results showed that the decoloration rate was up to 91.3% and the COD was reduced by 62% in wastewater after electrolyzation for 30 minutes under the optimized conditions of NaCl amount 5 g/L,voltage 8 V,wastewater pH 6 and initial mass concentration of methyl orange 6.0 mg/L. The results of mechanism study indicated that the redox reaction took place between the methyl orange and the hydroxyl radicals generated by electrolysis,which destroyed the chromophoric group of methyl orange and resulted in the breakage of some chemical bonds in it,so as to achieve the decolorization.