Pt助剂对N掺杂TiO2可见光光催化性能的影响

考察了Pt促进的N掺杂TiO2(Pt/N-TiO2)催化剂对光催化降解有机污染物性能的影响及其作用本质.采用X射线衍射、透射电镜、X射线光电子能谱、紫外-可见漫反射光谱、光电化学和荧光光谱等手段对催化剂进行了表征,并考察了样品在可见光下光催化降解甲基橙(MO)的反应性能.结果表明,Pt的存在并未明显改变N-TiO2的晶...

Influence of Pt Promoter on the Visible Light Photocatalytic Properties of N-Doped TiO_2

The influence of Pt as a promoter on the photocatalytical performance of nitrogen-doped TiO₂ was described. The sample was characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy, photoelectrochemistry, and photoluminescence. The degradation of methyl orange in aqueous solution under visible light irradiation was used to evaluate the photocatalytic activity of the sample. The modification of N-TiO₂ with Pt did not change the crystal structure and the mesoporous structure of TiO₂. The loading of Pt enhanced the material absorption in visible light region, which is assigned to background absorption that has detrimental effect on photocatalytic activity. However, the highly dispersed Pt on the surface of N-TiO₂ remarkably altered the surface structure (surface state) of N-TiO₂, contributing largely to the enhanced photocatalytic activity of nitrogen-doped TiO₂.