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《Acta Chimica Sinica》 2006-17
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Preparation, Characterization and Photocatalytic Performance of Anatase F Doped TiO_2 Sol

HUANG, Dong-Gen LIAO, Shi-Jun* DANG, Zhi (College of Chemistry, South China University of Technology, Guangzhou 510641)  
A fluorine doped TiO2 sol (F-TiO2) was prepared by a modified precipitation-sol-hydrothermal crystallization method using TiCl4 as precursor.The influence of F doping, hydrothermal treating temperature and time, pH values of medium on the morphology and crystallization was studied. The structure of as-prepared F-TiO2 sol was characterized by XRD, UV-Vis-DRS, TEM, TG-DTA, FTIR, XPS, and adsorption capacity determination and surface acidity determination. It was confirmed by XRD that F-TiO2 sol particles had anatase crystalline structure; moreover, the addition of fluorine could decrease the temperature and shorten the time of process of hydrothermal crystallization, and improve the crystallization of particle significantly. The TEM images indicated that F-TiO2 particles in sol were spherical, and the average particle size was ca. 6.5 nm. The XPS results showed that fluorine atoms were adopted by TiO2 sol particles with two forms. One was physically adsorbed on the surface of TiO2, and the other was embedded into TiO2 crystal lattice. The experiments of the determination on interfacial adsorption capacity, surface acidity and the photocatalytic activity found that F-TiO2 sol had stronger surface acidity, higher adsorption capability and good photocatalytic activity for decomposition of rhodamine B than pure TiO2 sol and P25 TiO2. Furthermore, the promotion mechanism of fluorine on the photocatalytic activities and structure of TiO2 was discussed based on the separation efficiency theory of charge carrier.
【Fund】: 广东省自然科学基金(No.036555)重点项目资助.
【CateGory Index】: O614.411
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