| Project/Area Number |
09044114
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
工業物理化学
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
OHTANI Bunsho Catalysis Research Center, Hokkaido Univ., Pro., 触媒化学研究センター, 教授 (80176924)
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| Co-Investigator(Kenkyū-buntansha) |
KONDO Toshihiro Grad. School of Sci., Hokkaido Univ., Inst., 大学院・理学研究科, 助手 (70240629)
UOSAKI Kohei Grad. School of Sci., Hokkaido Univ., Pro., 大学院・理学研究科, 教授 (20133697)
IKEDA Shigeru Catalysis Research Center, Hokkaido Univ., Inst., 触媒化学研究センター, 助手 (40312417)
YE Shen Grad. School of Sci., Hokkaido Univ., Inst., 大学院・理学研究科, 助手 (40250419)
PALMISANO Le パレルモ大学(イタリア), 教授
HOFFMANN Mic カリフォルニア工科大学(アメリカ), 教授
BOWMAN Rober カンザス大学(アメリカ), 助手
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥8,400,000 (Direct Cost: ¥8,400,000)
Fiscal Year 1999: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1998: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1997: ¥3,000,000 (Direct Cost: ¥3,000,000)
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| Keywords | Photocatalyst / Surface Area / Crystallinity / Recombination / Hydrothermal / Pyrolysis / Transfer Hydrolysis / Organic Solvents / 光触媒反応 / 光触媒活性の評価法 / 高表面積 / 超高速時間分解測定 / 再結合速度 |
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| 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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