TiO_2薄膜光催化降解甲基橙反应动力学研究

Kinetics Study of Photocatalytic Degradation of Methyl Orange on Titania Film

以甲基橙为模型污染物、TiO2薄膜为光催化剂,在自制的光催化反应器上进行了光催化降解反应实验,主要研究了甲基橙初始浓度(c0)和紫外光光照强度(I)对其光催化降解反应的影响。结果表明,该降解反应可用一级反应动力学方程进行描述,反应速率常数(k)与c0及光强I的关系分别为:k∝c0-1 4和k∝I0.65。

Using TiO_2 film as photocatalyst,photocatalytic degradation experiments for model pollutant(methyl orange) are carried out on the self-made photoreactor.Effects of initial concentration of methyl orange (c_0) and intensity of UV irradiation (I) on the photocatalytic degradation were investigated in detail.Results of kinetic study show that the degradation reaction can be expressed by the first-order reaction kinetic model,and the relationship between reaction rate constant (k) and initial concentration of methyl orange (c_0) and intensity of UV irradiation (I) are k∝c_0^-1.4 and k∝I^0.65 respectively.