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2005 Fiscal Year Final Research Report Summary

Self-assembly of titanias having surface organic moieties and development of visible-light responsible photocatalytic materials

Research Project

Project/Area Number 16510085
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nanomaterials/Nanobioscience
Research InstitutionKyoto University

Principal Investigator

IWAMOTO Shinji  Kyoto University, Graduate School of Engineering, Associate Professor, 工学研究科, 助手 (50252482)

Project Period (FY) 2004 – 2005
KeywordsTitania / Nanocrystal / Photocatalyst / Visible-light responsibility
Research Abstract

Thermal reaction of titanium tetraisopropoxide and tetraethyl orthosilicate in 1,4-butanediol (glycothermal method) afforded nanocrystalline silica-modified titanias having large surface area and superior thermal stability. In this study, the thus-obtained silica-modified titanias were treated in an NH_3 flow at high temperatures, and their physical and photocatalytic properties were investigated. Compared with NH_3-treated TiO_2 without silica modification, the NH_3-treated silica-modified titanias showed a stronger absorption in the visible region (400-500 nm) and had a larger peak at 396 eV in the N 1s XPS spectrum. These results indicate that a larger amount of nitrogen was stably doped in the silica-modified titania. The obtained products exhibited a high photocatalytic activity for degradation of Rhodamine B and decomposition of acetaldehyde under visible light irradiation. Nanocrystalline titanias modified with various elements (B, Mg, Al, P, Zn, and Ga) were also prepared by the glycothermal method and the obtained samples were nitrified in the same way. Among the six modifiers examined, addition of P was the most effective for photocatalytic decomposition of acetaldehyde under visible-light irradiation. After nitrification and annealing, the P-modified titania showed a strong absorption in the visible region (400-550 nm). It was found that the photocatalytic activity was related to the amount of nitrogen atoms doped in the anatase structure.

  • Research Products

    (14 results)

All 2007 2006 2005 2004 Other

All Journal Article (10 results) Patent(Industrial Property Rights) (4 results)

  • [Journal Article] Photocatalytic activities of NHs-treated titanias modified with other elements2007

    • Author(s)
      H.Ozaki, N.Fujimoto, S.Iwamoto, M.Inoue
    • Journal Title

      Applied Catalysis B : Environmental 70

      Pages: 431-436

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Photocatalytic activities of NH3-treated titanias modified with other elements2007

    • Author(s)
      H.Ozaki, N.Fujimoto, S.Iwamoto, M.Inoue
    • Journal Title

      Applied Catalysis B : Environmental 70

      Pages: 431-437

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Enhanced visible light sensitivity of nitrogen-doped nanocrystalline Si-modified titania prepared by the glycothermal method2005

    • Author(s)
      H.Ozaki, S.Iwamoto, M.Inoue
    • Journal Title

      Chemistry Letters 34

      Pages: 1082-1083

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] XANES and XPS study of silica-modified titanias prpared by the glycothermal method2005

    • Author(s)
      Sh.Iwamoto, Se.Iwamoto, M.Inoue, H.Yoshida, T.Tanaka, K.Kagawa
    • Journal Title

      Chemisry of Materials 17

      Pages: 650-655

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Improved visible-light responsive photocatalytic activity of N and Si co-doped titanias

    • Author(s)
      H.Ozaki, S.Iwamoto, M.Inoue
    • Journal Title

      Journal of Materials Science (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effect of the addition of a small amount of vanadium on the photocatalytic activities of N- and Si- co-doped titanias under visible-light irradiation

    • Author(s)
      H.Ozaki, S.Iwamoto, M.Inoue
    • Journal Title

      Catalysis Letters (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Photocatalytic activities of nanocrystalline silica-modified titanias prepared by the glycothermal method

    • Author(s)
      S.Iwamoto, H.Ozaki, K.Saito, M.Inoue
    • Journal Title

      Studies on Surface Science and Catalysis (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Improved visible-light responsive photocatalytic activity of N and Si co-doped titanias

    • Author(s)
      H.Ozaki, S.Iwamoto, M.Inoue
    • Journal Title

      Journal of Materials Science (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effect of the addition of a small amount of vanadium on the photocatalytic activities of N-and Si-co-doped titanias under visible-light irradiation

    • Author(s)
      H.Ozaki, S.Iwamoto, M.Inoue
    • Journal Title

      Catalysis Letters (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Photocatalytic activities of nanocrystalline silica-modified titanias prepared by the glycothermal method

    • Author(s)
      S.Iwamoto, H.Ozaki, K.Saito, M.Inoue
    • Journal Title

      Studies on Surface Science and Catalysis (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Patent(Industrial Property Rights)] 可視光応答性光触媒2007

    • Inventor(s)
      岩本伸司, 尾崎裕謙, 井上正志
    • Industrial Property Rights Holder
      国立大学法人京都大学
    • Industrial Property Number
      PCT/JP2007/52457
    • Filing Date
      2007-02-13
    • Description
      「研究成果報告書概要(和文)」より
  • [Patent(Industrial Property Rights)] 可視光応答性光触媒2006

    • Inventor(s)
      岩本伸司, 尾崎裕謙, 井上正志
    • Industrial Property Rights Holder
      国立大学法人京都大学
    • Industrial Property Number
      特願2006-43709
    • Filing Date
      2006-02-21
    • Description
      「研究成果報告書概要(和文)」より
  • [Patent(Industrial Property Rights)] Visible-light-sensitive photocatalyst based on titania2005

    • Inventor(s)
      岩本伸司, 尾崎裕謙, 井上正志
    • Industrial Property Rights Holder
      国立大学法人京都大学
    • Industrial Property Number
      US-patent, No.11/087, 175
    • Filing Date
      2005-03-23
    • Description
      「研究成果報告書概要(和文)」より
  • [Patent(Industrial Property Rights)] 紫外及び可視光応答性チタニア系光触媒2004

    • Inventor(s)
      岩木伸司, 尾崎裕謙, 井上正志
    • Industrial Property Rights Holder
      国立大学法人京都大学
    • Industrial Property Number
      特願2004-200959
    • Filing Date
      2004-07-07
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2008-05-27  

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