2000 Fiscal Year Final Research Report Summary
Development of Hyper Active Semiconductor Photocatalyst
Project/Area Number |
10555213
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Research Category |
Grant-in-Aid for Scientific Research (B).
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Allocation Type | Single-year Grants |
Section | 展開研究 |
Research Field |
Inorganic materials/Physical properties
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Research Institution | HOKKAIDO UNIVERSITY |
Principal Investigator |
OHTANI Bunsho Hokkaido Univ., Catalysis Research Center, Pro., 触媒化学研究センター, 教授 (80176924)
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Co-Investigator(Kenkyū-buntansha) |
UOSAKI Kohei Hokkaido Univ., Grad. School of Sci., Pro., 大学院・理学研究科, 教授 (20133697)
KOMINAMI Hiroshi Kinki Univ., Fac.Sci.Eng., Lec., 理工学部, 講師 (00257966)
IKEDA Shigeru Hokkaido Univ., Catalysis Research Center, Inst., 触媒化学研究センター, 助手 (40312417)
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Project Period (FY) |
1998 – 2000
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Keywords | Semiconductor Suspension / Photocatalysis / Ultrafast Laser / Titanium Dioxide / Anatase / Rutile / Electron-hole recombination / Recombination Rate Constant |
Research Abstract |
This study aimed at rationalization of the hypothesis that the most decisive factors controlling the photocatalytic activity of semiconductor powders is surface area and crystallinity. The larger the surface area becomes, the more the reaction substrate molecules are adsorbed on the surface, to result in the higher activity, while the higher the crystallinity of particles, the smaller the crystal defect inducing electron-hole recombination. Therefore it is expected that semiconductor particles having large surface area and being high crystallinity should exhibit high photocatalytic activity. We have developed the novel method of titanium (IV) oxide preparation without the use of water ; (1) Hydrothermal Crystallization of Organic Media (HyCOM), (2) Thermal Decomposition (TD), and (3) Transfer Hydrolytic Crystallization in Alcohols (THyCA). The titanium (IV) oxide powders thus prepared had large surface area and high crystallinity of anatase crystallites. As expected from these physical properties, these powders showed the photocatalytic activity, under both aerated and deaerated conditions which is marked higher than that of highly active commercially available titanium (IV) oxide (Degussa P-25). Thus, we have confirmed the principle for the design of ultra-highly semiconductor photocatalyst and developed the novel synthetic methods. By using femtosecond laser systems, the reduced rate of electron-hole recombination was clarified.
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Research Products
(16 results)
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[Publications] Ohtani, B., Kominami, H., Bowman, R.M., Colombo Jr., P., Noguchi, H.and Uosaki, K.: "Femtosecond Diffuse Reflectance Spectroscopy of Aqueous Titanium (IV) Oxide Suspension : Correlation of Electron-Hole Recombination Kinetics with Photocatalytic Activity"Chem.Lett.. 579-580 (1998)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Kominami, H., Kato, J.-i., Murakami, S.-y., Kera, Y., Inoue, M., Inui, T.and Ohtani, B.: "Synthesis of Titanium (IV) Oxide of Ultra-high Photocata lytic Activity : High-temperature Hydrolysis of Titanium Alkoxides with Water Liberated Homogeneously from Solvent Alcohols"J.Mol.Catal., A.Chem.. 144. 165-171 (1999)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Kominami, H., Kato, J.-i., Murakami, S.-y., Kohno, M., Kera, Y., Nishimoto, S.-i., Inoue, M., Inui, T.and Ohtani, B.: "Thermal Treatment of Titanium Alkoxides in Organic Media : Novel Synthesis Methods for Titanium (IV) Oxide Photocatalyst of Ultra-high Activity"Stud.Surf.Sci.Catal.. 130. 1937-1942 (2000)
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「研究成果報告書概要(欧文)」より
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[Publications] Ikeda, S., Sugiyama, N., Pal, B., Marci, G., Palmisano, L., Noguchi, H., Uosaki, K.and Uhtani, B.: "Photocatalytic Activity of Transition-Metal-Loaded Titanium (IV) Oxide Powders Suspended in Aqueous Solutions : Correlation with Electron-Hole Recombination Kinetics"Phys.Chem.Chem.Phys.. 3. 267-273 (2001)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Kominami, H., Oki, K., Kohno, M., Onoue, S.-i., Kera, Y.and Ohtani, B.: "Novel Solvothermal Synthesis of Niobium (V) Oxide Powders and Their Photocatalytic Activity in Aqueous Suspensions"J.Mater.Chem.. 11. 604-609 (2001)
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「研究成果報告書概要(欧文)」より
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