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P. Klankaw C. Chawengkijwanich N. Grisdanurak Siriluk Chiarakorn 《Superlattices and Microstructures》2012
The TiO2–SiO2 thin film was prepared by self-assembly method by mixing SiO2 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 SiO2 and even anatase TiO2 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 SiO2 was incorporated into the film. The self-assembly TiO2–SiO2 thin film exhibited the enhanced photocatalytic decolorization of methylene blue (MB) dye. The advantages of SiO2 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 (SiO2:TiO2) as 20:80 gave the best performance for photocatalytic decolorization of MB dye with the overall efficiency of 81%. 相似文献
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Nurak Grisdanurak Piaw Phatai Arthit Neramittagapong 《Reaction Kinetics and Catalysis Letters》2007,92(2):213-221
Nanosized Ce0.7Zr0.3Mx oxide particles (M=Zn, Sn, x = 0.1, 0.3, 0.5) with 10–20 nm diameter were synthesized by a coprecipitation method. Their
structure and morphology were characterized by XRD, FT-Raman and TEM. Zn did not incorporate well into Ce0.7Zr0.3 oxide, but Sn did. The catalytic performance of these particles for CO oxidation was investigated between 150–400°C under
severe conditions. Ce0.7Zr0.3Sn0.5 had the best performance with the lowest light-off temperature range (175–210°C). A temperature hysteresis was observed in
all catalysts studied. 相似文献
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Sonophotocatalytic activity of methyl orange over Fe(III)/TiO2 总被引:1,自引:0,他引:1
Kitirote Wantala Danutawat Tipayarom Laksana Laokiat Nurak Grisdanurak 《Reaction Kinetics and Catalysis Letters》2009,97(2):249-254
TiO2 doped with Fe3+ was prepared by an impregnation technique and its sonophotocatalytic activity over methyl orange (MO) was investigated. The
Fe/TiO2 surface presented red shift to longer wavelength, resulting in a lower energy band gap. Fe loading of 0.1 wt% on TiO2 provided the optimum degradation. The MO degradation rate constant under sonophotocatalytic conditions was 2.5 times higher
than under photocatalytic conditions. 相似文献
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Weradeach Sangkhun Laksana Laokiat Visanu Tanboonchuy Pummarin Khamdahsag Nurak Grisdanurak 《Superlattices and Microstructures》2012
W-doped TiO2 were immobilized on fiberglass cloth (FGC). The catalyst possessed small crystallite sizes with a red-shift on an absorption edge. Good dispersion was observed over the immobilized catalyst. The photocatalytic degradation of gaseous BTEX was conducted in a flow reactor under day-light fluorescent. Parameters including gas flowrate, catalyst loading, initial concentration and relative humidity (%RH) were investigated. The prepared catalysts showed higher efficiency than that of TiO2 approximately 18, 3, 3 and 2.5× for benzene, toluene, ethylbenzene and o-xylene, respectively. The condition to achieve 100% BTEX removal was found at 20 min/ml, catalyst loading 0.1 mg/cm2 and 30% RH. 相似文献
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