. 2011, 42(S2): 33-0.
Abstract (
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TiO2 sol was prepared by sol-gel technique using tetrabutyl titanate as precursor, PEG1000 as template, and acetyl acetone as stabilizer. The films were fabricated by dip-coating method on the glass slides. The crystalline structure, surface morphology, composition, transmittance, BET surface area and pore size distribution of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV-Vis spectrophotometer, and N2-adsoption and desorption. Photocatalytic degradation of methyl orange on the films under UV-light irradiation was investigated. The TiO2 film was in the anatase phase while Ti was in the Ti4+ state. With increasing amount of PEG1000, surface morphology of the films became rough, and pore size of the powders increased first and then decreased later. The absorption edge of the films in the UV region moved to short wavelength accompanied with fluctuation of transmittance, while film thickness maintained stable. PEG1000 had its optimum doping amount of 2 g when a lot of mesopores appeared in the film performing the largest surface area and optimum photocatalytic activity.