TiO2光催化降解活性艳兰KN-R的动力学研究

以纳米二氧化钛为光催化剂,研究了溶液pH值,TiO2投加量,H2O2用量及染料起始浓度对光催化降解活性艳兰KN-R动力学的影响.结果表明,TiO2光催化降解活性艳兰KN-R的反应遵循准一级反应动力学方程,且表观反应速率常数随溶液pH值的升高及染料起始浓度的降低而增大;TiO2和H2O2的投加量均存在一个最佳值,在本实验条件下,它们分别为0.5 g.l-1和2.0×10-2mol.l-1,低于或超过该值都会导致降解速率的下降.

Kinetic Study on Photocatalytic Degradation of Reactive Brilliant Blue KN-R by Titanium Dioxide

The photocatalytic degradation of Reactive Brilliant Blue KN-R has been investigated by using nano-TiO2 as photocatalyst.The effects of operation parameters such as initial dye concentration,catalyst loading,hydrogen peroxide dosage as well as initial pH value on kinetics of photocatalytic degradation are studied.The results show that the degradation of the dye follows a pseudo-first-order kinetics and the apparent rate constant increase with the increase of pH value and the decrease of dye concentration.Furthermore,the apparent rate constant would decrease when the addition of TiO2 and H2O2 are beyond or below the specific amounts and the optimum amounts of TiO2 and H2O2 under the experimental conditions are 0.5 g·L-1 and 2.0×10-2 mol·L-1,respectively.