UV/TiO_2体系中SF Blue染料溶液的降解动力学研究

以市售商品TiO2为光催化剂,以SFBlue制衣染料溶液模拟实际印染废水,研究光照时间、TiO2投加量、染料溶液浓度、pH值、温度对UV/TiO2体系降解染料废液效果的影响和宏观动力学。结果表明,UV/TiO2对SFBlue染料废液具有良好的处理效果,而且在发生光催化降解的同时还伴随着光分解反应,光催化降解反应为表观二级反应,活化能50.1kJ·mol-1,指前因子4.47×105L.mg-1.min-1;光分解反应为表观一级反应,活化能14.8kJ·mol-1,指前因子1.67min-1。UV/TiO2体系降解染料废液受到光照时间、TiO2投加量、染料溶液浓度、pH值、温度等因素的影响,TiO2最佳投加量为1.2g.L-1,染料溶液初始pH值≤3时,TiO2对SFBlue染料具有强烈吸附作用。

Degradation Kinetics of Dye SF Blue in UV/TiO2 Suspension System

The degradation efficiency, effect factors （such as reaction time, TiO2 dosage, dye concentration, initial pH value and temperature） and kinetics of dye SF Blue in UV/TiO2 suspension system are investigated. The results show that UV/TiO2 has a high activity on degradation of dye SF Blue in solution, and the photodecomposition reaction of the dye is concurrent besides the photocatalytic degradation. The results also show that the photocatalytic degrada tion of the dye in UV/TiO2 system is a second-order reaction apparently, with activation energy 50.1 kJ · mol^-1 and pre-exponential factor 4.47×10^5 L·mg^-1· min ^-1 while the photode- composition of the dye in UV system is a first-order reaction apparently, with activation energy 14.8 kJ ·mol^-1 and pre-exponential factor 1.67min^-1 In addition, the adsorption of the dye on TiO2 surface becomes very strong when the initial pH value of dye solution being and below 3.