Synthesis of nanocrystalline TiO2 with high photoactivity and large specific surface area by sol-gel method |
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Authors: | Liqun Mao Qinglin Li Zhijun Zhang |
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Affiliation: | a State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou 730000, PR China b Laboratory of Special Functional Materials, Henan University, Kaifeng 475001, PR China |
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Abstract: | Nano-TiO2 powder was prepared by sol-gel method with modified precursor, tetrabutyl titanate (TBT), and photocatalytic oxidation was applied in removal of organics in the powder. The microstructure of as-prepared nano-TiO2 was determined using UV-vis, TEM, XRD and BET. The results indicated that the nano-TiO2, with grain size of 3.8 nm and specific surface area of 359.1 m2/g, was composed of anatase alone, and that it exhibited significant blue-shift in its UV-vis spectrum. The decomposition of organics in the sample was systematically investigated using FT-IR and TG-DTA. According to the testing results, we could conclude that organics in the samples were completely eliminated by means of photocatalytic oxidation. With photocatalytic decoloration of active brilliant red X-3B in aqueous solution as model reaction, the photocatalytic activity of as-prepared nano-TiO2 was investigated and was compared with that of the samples experiencing heat treatment and Degussa P-25 as well. The experimental results indicated that the photoactivity of as-prepared nano-TiO2 is much higher than that of the samples experiencing heat treatment. |
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Keywords: | A. Semiconductors A. Nanostructures B. Sol-gel chemistry D. Catalytic properties |
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