[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.