纳米二氧化钛光催化降解染料废水动力学研究

摘要

以纳米二氧化钛为光催化剂，研究了光催化降解染料废水溶液的动力学规律及溶液的pH 值、TiO2投加量和染料起始浓度对光催化降解活染料废水动力学的影响。结果表明，该反应符合Langmuir-Hinshelwood（ L-H）动力学模型，且光催化过程符合一级反应动力学方程，一级反应动力学常数（ K'）随溶液 pH 值及染料起始浓度的降低而增大；TiO2的最佳投加量为2.0 g/L，低于或超过该值都会导致降解速率的下降。%The dynamics of photocatalytic degradation of dyeing waste water has been investigated by using nano-TiO2 as photocatalyst. Furthermore,the effects of operation parameters such as initial dye concentra-tion,catalyst loading,and solution of the pH on the dynamics of photocatalytic degradation were dis-cussed. The results showed that the reaction accords with Langmuir-Hinshelwood( L-H)model and the reaction is a first-order reaction and the reaction kinetics constant( K')increase with the decrease of pH value and the initial concentration of dye. Meanwhile,the K' value would decrease when the addition of TiO2 is beyond or below the optimum amounts of TiO2 2. 0 g/L.