| Preparation and characterization of highly photoactive nanocrystalline TiO_2 powders by solvent evaporation- induced crystallization method |
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| 作者姓名： | 余家国 余济美 程蓓 赵修建 |
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| 作者单位： | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing，Wuhan University of Technology，Wuhan 430070 China，Department of Chemistry，The Chinese University of Hong Kong，Hong Kong China，State Key Laboratory of Advanced Technology for Materials Synthesis and Processing，Wuhan University of Technology，Wuhan 430070 China，State Key Laboratory of Advanced Technology for Materials Synthesis and Processing，Wuhan University of Technology，Wuhan 430070 China |
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| 基金项目： | 国家自然科学基金，教育部留学回国人员科研启动基金，国家自然科学基金 |
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| 摘 要： | Highly photoactive bi-phase nanocrystalline TiO2 photocatalyst was prepared by a solvent evaporation-induced crystallization (SEIC) method, and calcined at different temperatures. The obtained TiO2 photocatalyst was characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET surface areas. The photocatalytic activity was evaluated by the photocatalytic oxidation of acetone in air. The results show that solvent evaporation can promote the crystallization and phase transformation of TiO2 at 100℃. When calcination temperatures are below 600℃, the prepared TiO2 powders show bimodal pore size distributions in the mesoporous region. At 700℃, the pore size distributions exhibit monomodal distribution of the inter-aggregated pores due to the collapse of the intra-aggregated pores. At 100℃, the obtained TiO2 photocatalyst by this method shows good photocatalytic activity, and at 400℃, its photocatalytic activity exceeds that of Degussa P25. This may be attributed to the fact t
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Preparation and characterization of highly photoactive nanocrystalline TiO2 powders by solvent evaporation-induced crystallization method |
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| YU Jiaguo,YU Jimmy C. CHENG Bei
& ZHAO Xiujian
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan ,China.Preparation and characterization of highly photoactive nanocrystalline TiO_2 powders by solvent evaporation- induced crystallization method[J].Science in China(Chemistry),2003,46(6). |
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| Authors: | YU Jiaguo YU Jimmy C CHENG Bei
& ZHAO Xiujian
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China |
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| Institution: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
2. Department of Chemistry, The Chinese University of Hong Kong, Hong Kong, China |
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| Abstract: | Highly photoactive bi-phase nanocrystalline TiO2 photocatalyst was prepared by a solvent evaporation-induced crystallization (SEIC) method, and calcined at different temperatures. The obtained TiO2 photocatalyst was characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET surface areas. The photocatalytic activity was evaluated by the photocatalytic oxidation of acetone in air. The results show that solvent evaporation can promote the crystallization and phase transformation of TiO2 at 100℃. When calcination temperatures are below 600℃, the prepared TiO2 powders show bimodal pore size distributions in the mesoporous region. At 700℃, the pore size distributions exhibit monomodal distribution of the inter-aggregated pores due to the collapse of the intra-aggregated pores. At 100℃, the obtained TiO2 photocatalyst by this method shows good photocatalytic activity, and at 400℃, its photocatalytic activity exceeds that of Degussa P25. This may be attributed to the fact that the prepared TiO2 photocatalyst has higher specific surface areas, smaller crystallite size and bimodal pore size distribution. |
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| Keywords: | nanocrystalline TiO2 photocatalyst preparation solvent evaporation-induced crystallization method |
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