TiO2/多孔硅胶对乙烯光催化降解的研究

在可见光或紫外光照的非循环体系中,进行了氧化钛基的催化剂光催化降解乙烯的研究.考察了不同的乙烯初始浓度、不同温度、不同光源和负载贵金属对光降解效率的影响.结果表明,乙烯浓度在38～188 mg/m³范围时,光降解效率随乙烯初始浓度升高而缓慢地线性下降;温度升高有利于光降解;负载的贵金属不仅抑制电子空穴对复合,而且扩大了氧化钛对可见光的吸收,几十倍地提高了氧化钛在可见光的光催化效率.

Photocatalytic Degradation of Ethylene over Titania-based Photocatalysts

The photocatalytic degradation of ethylene over titania-based photocatalysts was studied under a non-circulating system using visible or near-UV light. The roles of the reaction temperature and the inlet concentration of ethylene and the influence of different light source were investigated. Then the efficiency of noble metals-doped photocatalyst was compared with that of the bare one. The experiment results indicated that when the inlet concentration was in range of 38-188 mg/m3 the photo-degradation efficiency of the bare photocatalyst dropped linearly and very slowly with the increase of inlet concentration of ethylene; the degradation efficiency increased as raising the reaction temperature; noble metals not only decreased the recombination of electron-hole pairs, but also increased the absorption for visible light, leading to the photocatalytic efficiency in several-tens times higher in visible light.