几种偶氮染料的光催化降解研究

Study on the Photocatalytic Degradation of Azo dyestuff in Aqueous Solution

以高压汞灯、UV灯、太阳光为光源 ,进行 H2 O2 、Ti O2 对酸性品红、活性大红、刚果红、结晶紫及混合染料等几种偶氮染料光催化降解研究。结果表明 :Ti O2 、H2 O2 对几种偶氮染料具有较强的光催化降解脱色效果 ,在 p H为 3或 9时 ,H2 O2 的浓度为 0 .4 %或 Ti O2 浓度为 0 .2 5%时 ,其脱色率最高 ;Ti O2 的光催化脱色效果强于 H2 O2 的作用 ,且混合催化剂的光催化脱色作用更强 ;光催化降解属于一级动力学反应 ,同时

Photocatalytic degradation of five azo dyestuff by H 2O 2 and TiO 2 were studied under the high pressure mercury lamp,UV lamp and sunlight H 2O 2 and TiO 2 had a significant photocatalytic decolorizing effect on these dyes When the dyes pH was 3 or 9, concentrations of H 2O 2and TiO 2 were 0 4% and 0 25%,they showed the highest decolorizing rate The decolorizing effect of TiO 2 was better than that of H 2O 2 The mix catalytic showed a even better decolorizing effect The reaction of photo catalytic degradation was first order reaction in kinetics There was a positive relationship between remove ratio of COD and decolorizing ratio