期刊
MATERIALS RESEARCH BULLETIN
卷 45, 期 7, 页码 818-825出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2010.03.014
关键词
Oxides; Sol-gel chemistry; X-ray diffraction; Catalytic properties; Surface properties
Doped TiO2 particles were synthesized by solid grinding and sot-gel methods. The ensuing powders were analysed by X-ray diffraction (XRD). X-ray photoelectron spectroscopy (XPS), and ground state diffuse reflectance absorption spectroscopy (GSDR). The doped samples prepared by solid grinding at 400 degrees C were in the anatase form, while those synthesised via sot-get method and calcinated at the same temperature were dominated by the rutile phase. The X-ray photoelectron spectroscopy (XPS) revealed a surface segregation of the doping elements namely for Y, Rb and Rb-Y. The photocatalytic activity of the prepared catalysts, under sunlight irradiation, was evaluated using 2-naphthol as a pollutant model. Results showed a great enhancement in the photocatalytic efficiency with incorporation of Y in samples prepared by solid grinding, while in samples prepared via sot-gel process both Rb and Y dopants greatly improve the photocatalytic activity. The Langmuir-Hinshelwood model was used to describe the photocatalytic reactions from which a pseudo-first-order kinetics was established. The repeatability of photocatalytic activity was also tested for several degradation cycles. (C) 2010 Elsevier Ltd. All rights reserved.
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