固体超强酸SO_4^(2-)/TiO_2-WO_3光催化降解邻硝基苯酚动力学研究

Kinetic Study on Photocatalytic Degradation of o-Nitrophenol by Solid Superacid SO_4^(2-)/TiO_2-WO_3

在高压汞灯下,研究了邻硝基苯酚在SO42-/TiO2-WO3光催化剂表面的降解过程,对邻硝基苯酚在SO42-/TiO2-WO3悬浮体系中的降解机理进行了初步的探讨。结果表明,光降解反应速率受邻硝基苯酚的初始浓度、气相氧流量、反应温度、溶液pH值、光强度和催化剂用量等因素的影响。基于Langmuir-Hinshelwood方程和一些假设,分析了邻硝基苯酚光降解的动力学机理,推导了固体超强酸SO42-/TiO2-WO3催化邻硝基苯酚光降解的动力学方程。

This paper investigates the degradation process of o-nitrophenol on the surface of SO4^2-/TiO2-WO3 photocatalyst with the help of high pressure mercury vapor lamp. The preliminary discussion is made on the degradation mechanism of o-nitrophenol in SO4^2-/TiO2-WO3 suspension system. The result shows that the photodegradation reaction rate depends on the initial concentration of o-nitrophenol, flow rate of gas phase oxygen, reaction temperature, pH value of solution, light intensity and dosage of catalyst. Based on the Langmuir- Hinshelwood equation and some hypotheses, kinetics mechanism of photodegradation of o-nitrophenol is analyzed, and kinetics equation of photocatalytic degradation of o-nitrophenol by solid superacid SO4^2-/TiO2-WO3 is derived in this paper.