光辐射对水溶性偶氮染料还原脱色反应的影响

以硼氢化物和硫酸盐混合物为还原脱色剂，对17个水溶性阴离子偶氮染料进行光还原脱色降解，考察求灯辐射光对其还原脱色反应的影响，并运用紫外可见光谱法进行分析。结果表明，辐射光对水溶性偶氮染料的还原脱色反应具有明显的促进作用，6种目标染料在光辐射下的脱色率也明显高于室内条件下的脱色率，两者之间的差距随着反应时间的延长而增加，尤其以直接染料的表现更为突出。紫外可见光谱显示，在光还原脱色反应中，染料分子中的共轭体系和芳香环结构均遭到破坏。

Influence of light radiation on reductive decoloration of soluble azoic dye

The decoloration of seventeen anionic water-soluble azoic dyes in aqueous solutions was carried out by photo-assistant bisulfate-mediated borohydride reduction. The effect of mercury lamp irradiation on the reducing decoloration of azoic dyes was investigated, and characterized through UV-Vis spectrum. The results indicate that the reduction of azoic dyes was improved significantly by irradiation in general. The decoloration efficiency of six dyes irradiated by mercury lamp were much higher than those in control experiments inside room at the same conditions and prolonging of irradiation time could increase the differences between both decoloration efficiency of dyes, particular in direct dyes. UV-Vis spectra show that the conjugate structure and aromatic part of dyes were destroyed after being photo-reducing degradation.