Photocatalytic Activity of N-doped TiO2 Photocatalysts Prepared from the Molecular Precursor （NH4）2TiO（C2O4）2  

以草酸氧钛铵分子为前驱体制备N掺杂的TiO2光催化剂

作　　者：卜晶[1] 方钧[1] 石富城[1] 姜志全[1] 黄伟新[1] 

机构地区：[1]中国科学技术大学合肥微尺度物质科学国家实验室,中国科学院能量转换材料重点实验室,化学物理系,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2010年第1期95-101,I0002,共8页化学物理学报（英文）

基　　金：ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China （No.20773113）, the Solar Energy Project of Chinese Academy of Sciences, the Ministry of Education program for PCSIRT （No.IRT0756）, and the Max Planck Gesellschaft of Chinese Academy of Sciences partner group.

摘　　要：We developed a novel approach for the preparation of N-doped TiO2 photocatalysts by calcining ammonium titanium oxalate at different temperatures. The structures of N-TiO2 were characterized by powder X-ray diffraction, infrared spectroscopy, thermogravimetric analysis, N2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy, diffuse reflectance UV-Vis spectroscopy, and scanning electron microscope. The N-doped TiO2 photocatalysts calcined below 700 ℃ are the pure anatase phase but that calcined at 700 ℃ is a mixture of anatase and rutile phases. The doped N locates at the interstitial site of TiO2 which leads to the narrowing of bad gap of pure anatase N-TiO2. Among all photocatalysts, N-TiO2 photocatalysts calcined at 600 and 400 ℃ exhibit the best performance in the photodegradation of methyl orange under the UV light and all-wavelength light illuminations, respectively; however, because of the perfect crystallinity and the existence of anatase-rutile phase junctions, N-TiO2 photocatalyst calcined at 700 ℃ exhibits the highest specific photodegradation rate, i.e., the highest quantum yield, under both the UV light and all-wavelength light illuminations.

关 键 词：N-doped TiO2 Ammonium titanyl oxalate Photocatalysis 

分 类 号：TQ225.142[化学工程—有机化工] X703[环境科学与工程—环境工程]