悬浮纳米TiO2自然光助催化降解偶氮染料酸性大红GR

以自然光为光源,悬浮纳米TiO2为光降解催化剂,研究了溶液pH值、酸性大红GR初始质量浓度、TiO2质量浓度、H2O2的质量浓度及光照时间对偶氮染料酸性大红GR降解的影响.结果表明悬浮纳米TiO2自然光光助催化降解酸性大红GR的适宜条件为:溶液pH值6.5,酸性大红GR初始质量浓度40 mg/L,TiO2质量浓度1.2 g/L,H2O2质量浓度5 g/L,光照时间为120 min.在此条件下,酸性大红GR降解率达75%以上,且降解反应符合一级反应动力学,其动力学常数为0.011 min-1.

Solar photocatalytic degradation of acid red GR azo dye in aqueous suspensions of nanometer TiO2

The effects of pH, acid red GR dye initial concentration, TiO2 dosage, H2O2 addition and radiation time on the photocatalytic degradation of acid red GR azo dye in aqueous suspensions of nanometer TiO2 under natural daylight were studied,The experimental results indicated that the most appropriate conditions of the photocatalytic degradation were pH 6.5, acid red GR dye initial concentration 40 mg/L, TiO2 dosage 1.2 g/L and H2O2 addition 5 g/L. The degradation rate reached over 75% under these conditions after the radiation for 120 min. Further studies showed that the degradation followed the first-order kinetics and the rate constant was equal to 0.011 min-1.