文献类型：期刊文献

英文题名：Preparation of controllable crystalline titania and study on the photocatalytic properties

作者：Yan, Maocheng[1]; Chen, Feng[1]; Zhang, Jinlong[1]; Anpo, Masakazu[2]

机构：[1]E China Univ Sci & Technol, Adv Mat Lab, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]Osaka Prefecture Univ, Grad Sch Engn, Dept Appl Chem, Sakai, Osaka 5998531, Japan

年份：2005

卷号：109

期号：18

起止页码：8673

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY B

收录：;EI(收录号：2005249152589);WOS:【SCI-EXPANDED(收录号:WOS:000228982900024)】；

语种：英文

外文关键词：Adsorption - Catalysts - Fourier transform infrared spectroscopy - Microemulsions - Nanostructured materials - Nitrogen - Photocatalysis - Photodegradation - Surface chemistry - Ultraviolet spectroscopy - X ray diffraction analysis

摘要：Nanocrystalline TiO(2) catalysts with different anatase/rutile ratios and high surface area (113-169 m(2)/g) have been prepared at low temperature by the microemulsion-mediated hydrothermal method. The samples were characterized by x-ray diffraction (XRD), Fourier transform (FT)-IR spectra, UV-vis diffuse reflectance spectra, and nitrogen adsorption-desorption methods. The contents of anatase and rutile phases in the TiO(2) powders have been successfully controlled by simply changing the proportion of Cl(-) and SO(4)(2-) in the aqueous phase of the microemulsion. A proposed mechanism involving bidentately chelated sulfate is discussed to explain the variation of the crystalline phase in the TiO(2) powder. The photodegradation of methyl orange (MO) in water has been investigated over titanium dioxide consisting of different anatase/rutile ratios. The catalyst containing 74.2% anatase showed the highest photocatalytic activity, which is due to a synergistic effect between anatase and rutile. The synergism was also found for the photodegradation of MO with physically mixed anatase and rutile as catalysts.