The hybrid photocatalyst of TiO 2-SiO 2 thin film prepared from rice husk silica
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Author list: Klankaw P., Chawengkijwanich C., Grisdanurak N., Chiarakorn S.
Publisher: Elsevier
Publication year: 2012
Journal: Superlattices and Microstructures (0749-6036)
Volume number: 51
Issue number: 3
Start page: 343
End page: 352
Number of pages: 10
ISSN: 0749-6036
eISSN: 1096-3677
Languages: English-Great Britain (EN-GB)
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Abstract
The TiO 2-SiO 2 thin film was prepared by self-assembly method by mixing SiO 2 precursor with titanium precursor solution and aged to obtain a co-precipitation of silica and titanium crystals. Dip coating method was applied for thin film preparation on glass slide. The X-ray diffraction (XRD) of the self-assembly thin film had no characteristic property of SiO 2 and even anatase TiO 2 but indicated new crystal structure which was determined from the Fourier Transform Infrared Spectrophotometer (FTIR) as a hybridized Ti-O-Si bonding. The surface area and surface volume of the self-assembly sample were increased when SiO 2 was incorporated into the film. The self-assembly TiO 2-SiO 2 thin film exhibited the enhanced photocatalytic decolorization of methylene blue (MB) dye. The advantages of SiO 2 are; (1) to increase the adsorbability of the film and (2) to provide the hydroxyl radical to promote the photocatalytic reaction. The self-assembly thin film with the optimum molar ratio (SiO 2:TiO 2) as 20:80 gave the best performance for photocatalytic decolorization of MB dye with the overall efficiency of 81%.ฉ 2011 Elsevier Ltd. All rights reserved.
Keywords
Photocatalytic process, self-assembly, SiO 2
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