| Project/Area Number |
18550183
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Hachinohe National College of Technology |
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Principal Investigator |
HASEGAWA Akira Hachinohe National College of Technology, Department of Chemical and Biological Engineering, Associate Professor (30198709)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Yoshitaka Hachinohe National College of Technology, Department of Electrical and Computer Engineering, Associate Professor (00290685)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥4,090,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥390,000)
Fiscal Year 2007: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2006: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | Photocatalyst / TiO_2 / square rod / oxygen defects / 5-coodinated Ti / 角柱状 / 粒子形態 |
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| Research Abstract |
Various TiO_2 were prepared by sol-gel process using titanium tetraisopropoxide (TTIP) and different dilos. We prepared successfully the highly ctystalline precursors, Ti (OCH (CH_3)CH_2CH_2O)_2 from 1, 3-butanediol and Ti (OCH_2CH_20)_2 from ethylene glycol. In particular, the titanium alkoxy-diolate from 1, 3-butanediol was drastically decomposed at 346℃ and transformed to TiO_2 phase with the square rod framework. The square rod TiO_2, whose typical size was estimated to be 1.5μm long and 0.3μm in width, was easily synthesized by the calcination of precursors at 500℃ in air. The framework of square rod TiO_2 was constructed from fine TiO_2 particles with 25 nm in diameter. EXAFS and XPS analyses revealed the presence of 5-coodinated. Ti species and oxygen defects.
The photocatalytic activities as high as P25 was achieved during the photo-oxidation of acetaldehyde. The activity was due to the high distribution of oxygen defects of TiO_2 particles, which were components of the construction of the square rod framework. In addition, the oxygen defect acted effectively as a photo-oxidation site by the capture of hole generated by UV irradiation. It concluded that both oxygen defect and square rod shape were essential for the generation of the photo-oxidation activity
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