期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 228, 期 1, 页码 22-27出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2011.11.007
关键词
Photocatalysis; CdO; CdTiO3; Coupled oxides; Thin films
资金
- Consejo Nacional de Ciencia y Tecnologia (CONACYT) [CB-2008-106912]
- Instituto de Ciencia y Tecnologia del Distrito Federal (ICYTDF) [PICCO10-81]
In the preparation of CdO+CdTiO3 polycrystalline thin films by the sol-gel method, the optical, structural and crystalline properties, as well as the photocatalytic activity (PA) depends strongly on the sintering temperature (Ts) of the films and of the Ti/Cd ratio used in the precursor solution. In this work, CdO+CdTiO3 thin films were prepared using a Ti/Cd constant ratio in the precursor solution. The films were sintered at six different Ts in the 450-550 degrees C range, in an open atmosphere. The structure of the films was characterized by X-ray diffraction and the PA was evaluated by the photobleaching of methylene blue in an aqueous solution using a UV-vis spectrometer. The relative intensity of the diffraction peaks associated with CdO and CdTiO3, change with the Ts. The better photocatalytic activities were obtained for the films sintered at 490 degrees C and 550 degrees C. When the CdO was removed from the films by chemical etching the PA decreased, showing the importance of coupling both oxides. (C) 2011 Elsevier B.V. All rights reserved.
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