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Effect of ultraviolet irradiation on crystallization behavior and surface microstructure of titania in the sol-gel process |
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| Authors: | Bifen Gao Ying Ma Jincai Zhao |
| Institution: | a Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, PR China b College of Physics, Nankai University, Tianjin 300071, PR China c Graduated School of Chinese Academy of Science, PR China |
| Abstract: | Nanosized titania was prepared at various hydrolysis ratios (r=H2O/Ti) by photo-assisted and conventional sol-gel methods. It was found that hydrolysis ratio and ultraviolet irradiation greatly affect the titania crystallization behavior. The introduction of photo-irradiation benefits anatase formation throughout a wide range of hydrolysis ratio. XPS results show that hydrolysis reaction was promoted by ultraviolet irradiation. In addition, photo-irradiation was also verified to be in favor of the generation of large specific surface area and high crystallinity, which resulted in relative high photocatalytic activity of TiO2 prepared by a photo-assisted sol-gel method. |
| Keywords: | Titanium dioxide Sol-gel process Photo-irradiation Crystallization Photocatalysis Surface microstructure Anatase Rutile Hydrolysis Condensation |
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