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2007 Fiscal Year Final Research Report Summary

Design of high functional photocatalysts based on higher space and time analyses of the active reaction species

Research Project

Project/Area Number 14050043
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionNagaoka University of Technology

Principal Investigator

NASAKA Yoshio  Nagaoka University of Technology, Departmentof Chemistry, Professor (30134969)

Co-Investigator(Kenkyū-buntansha) MURAKAMI Yoshinori  Nagaoka University of Technology, Research Associate (70293256)
Project Period (FY) 2002 – 2007
Keywordsphotocatalysis / nano materials / surface interface reaction / titanium dioxide / new energy
Research Abstract

This project aims to design a new superior active photocatalysts by elucidating the behavior and time dependence of active species on the catalysts. In this final year, singlet molecular oxygen and OH radical were investigated. Singlet oxygen was formed as a absorbed state, and it decays by the interaction with titanium oxide. The reduction of molecular oxygen followed by the oxidation at the same photocatalysts has been regarded as the electron-hole recombination in the photocatalyst. Though the singlet oxygen was deactivated without reaction, we could show the decay of singlet oxygen by some organic molecules is within a micro second. The OH radicals released from titanium oxide to gas phase were detected by means of laser induced fluorescence technique and the mechanism of the formation of OH radical was investigated from the time dependence of the detected radicals. We found that the OH radical was formed by the reduction of adsorbed hydrogen peroxides which are accumulated on the surface by the oxidation of water and the reduction of molecular oxygen. Heat treatment of titanium oxide powders changes the properties of surface OH groups and promotes the OH radical formation. Based on the above observation, a photocatalyst of tube structure, titanate nanotube, was prepared and photocatalytic activities were tested. Since the negatively charged titanate nanotube accommodates negatively charged species, it was demonstrated the potential applications to the decomposition of cationic species. In the future study, the analysis of hydrogen peroxide on the photocatalysts seems to be an important subject.

  • Research Products

    (17 results)

All 2008 2007 Other

All Journal Article (15 results) (of which Peer Reviewed: 7 results) Presentation (1 results) Remarks (1 results)

  • [Journal Article] Formation of singlet molecular oxygen associated with the formation of superoxide radicals in aqueous suspensions of TiO_2 photocatalysts2008

    • Author(s)
      Toshihiro Daimon
    • Journal Title

      Appl. Catal. A, General (In press)

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Monitoring the Formation and Decay of Singlet Molecular Oxygen in TiO_2 Photocatalytic Systems and the Reaction with Organic Molecules2008

    • Author(s)
      Toshihiro Daimon
    • Journal Title

      Electrochemistry 76

      Pages: 196-199

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] 「研究成果報告書概要(和文)」より2008

    • Author(s)
      Yoshinori Murakami
    • Journal Title

      Electrocbem Solid State Lett 11

      Pages: H42-H46

    • Peer Reviewed
  • [Journal Article] Monitoring the Form ation and Decay of Singlet Molecular Oxygen in TiO_2 Photocatalytic Systems and the Reaction with Organic Molecules2008

    • Author(s)
      Toshihiro Daimon, Tsutomu Hirakawa, Yoshio Nosaka
    • Journal Title

      Electrochemistry 76(2)

      Pages: 196-199

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Laser ablation of the photocatalytic BiVO_4 and BiZn_2VO_6 powders in water and their photocurrent properties2008

    • Author(s)
      Yoshinori Murakami, Manabu Ikarashi, Masaharu Hashizume, Atsuko Y. Nosaka, Yoshio Nosaka
    • Journal Title

      Electrochem Solid State Lett 11(2)

      Pages: H42-H46

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Can OH Radicals Diffuse from the UV-irradiated Photocatalytic TiO_2 Surfaces? Laser-Induced Fluorescence Study.2007

    • Author(s)
      Yoshinori Murakami
    • Journal Title

      J. Pbys. Chem, C

      Pages: 11339-11346

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Adsorption and Decomposition of a Dipeptide (Ala-Trp)in TiO_2 Photocatalytic Systems ;2007

    • Author(s)
      Trung H. Tran
    • Journal Title

      J. Photochem. Photobiol. A. Chem 192

      Pages: 105-113

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Photocatalytic Reactivity for 0_2 . and OH ・ Radical Formation in Anatase and Rutile TiO_2 Suspension as the Effect of H_20_2 Addition2007

    • Author(s)
      Tsutomu Hirakawa
    • Journal Title

      Appl. Cat. A, General 325

      Pages: 105-111

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Can OH Radicals Diffuse from the UV-irradiated Photocatalytic TiO_2 Surfaces? Laser-Induced Fluorescence Study.2007

    • Author(s)
      Yu Yang
    • Journal Title

      Adv. Technol. Mater. Mater. Process, J 9

      Pages: 11339-11346

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Can OH Radicals Diffuse from the UV-irradiated Photocatalytic TiO_2 Surfaces? Laser-Induced Fluorescence Study.2007

    • Author(s)
      Yoshinori Murakami, Kenji Endo, Ikki Ohta, Atsuko Y Nosaka, Yoshio Nosaka
    • Journal Title

      J. Phys. Chem, C. 111(30)

      Pages: 11339-11346

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Adsorption and Decomposition of a Dipeptide (Ala-Trp) in TiO_2 Photocatalytic Systems2007

    • Author(s)
      Trung H. Tran, Atsuko Y. Nosaka, Yoshio Nosaka
    • Journal Title

      J. Photochem. Photobiol. A. Chem. 192

      Pages: 105-113

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Photocatalytic Reactivity for O_2 ・ and OH ・ Radical Formation in Anatase and Rutile TiO_2 Suspension as the Effect of H_2O_2 Addition2007

    • Author(s)
      Tsutomu Hirakawa, Kenta Yawata, Yoshio Nosaka
    • Journal Title

      Appl. Cat. A, General 325

      Pages: 105-111

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] An Approach to Estimating Photocatalytic Activity of TiO_2 Photocatalyst by Monitoring Dissolved Oxygen and Superoxide Ion on Decomposing Organic Compounds2007

    • Author(s)
      Tsutomu Hirakawa, Toshihiro Daimon, Masahiro Kitazawa, Nobuaki Ohguri Chifumi Koga, Nobuaki Negishi, Sadao Matsuzawa, Yoshio Nosakai
    • Journal Title

      J. Photochem. Photobiol. A. Chem. 190

      Pages: 58-68

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] A Novel Photocatalyst, BiCu_2PO_6, for Efficient Visible-Light-Driven Oxygen Evolution2007

    • Author(s)
      Yu Yang, Yoshinori Murakami, Atsuko Y. Nosaka, Yoshio Nosaka
    • Journal Title

      Adv. Technol. Mater. Mater. Process, J 9

      Pages: 115-118

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Formation of singlet molecular oxygen associated with the formation of superoxide radicals in aqueous suspensions of TiO_2 photocatalysts

    • Author(s)
      Toshihiro Daimon, Tsutomu Hirakawa, Masahiro Kitazawa, Junya Suetake, Yoshio Nosaka
    • Journal Title

      Appl. Catal. A, General (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Spectroscopic Detection of Singlet Molecular Oxygen and OH Radicals in TiO_2 Photocatalysis2007

    • Author(s)
      Yoshio Nosaka
    • Organizer
      2nd Intl Conf. Semiconductor Photochemistry
    • Place of Presentation
      Aberdeen, UK
    • Year and Date
      2007-07-25
    • Description
      「研究成果報告書概要(和文)」より
  • [Remarks] 「研究成果報告書概要(和文)」より

    • URL

      http://mst.nagaokaut.ac.jp/nosaka/gyos79.html

URL: 

Published: 2010-06-09  

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