Hydrothermal synthesis of nanosized titania photocatalysts using novel water-soluble titanium complexes

Makoto Kobayashi, Koji Tomita, Valery Petrykin, Shu Yin, Tsugio Sato, Masahiro Yoshimura, Masato Kakihana

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    19 Citations (Scopus)


    Highly crystalline titania nano-particles were synthesized by hydrothermal method using novel stable water-soluble titanium complexes. It was confirmed that single phase anatase, rutile and brookite, which can be rarely synthesized as a single phase, can be obtained by varying the ligand in the complex and pH of the aqueous solution. TEM observations and BET specific surface area measurements had shown that these samples consisted of nanosized particles of 5-200 nm and had high specific surface areas of 25-150 m2/g. According to UV-visible diffuse reflectance spectra, these titania samples absorbed light in the visible region (λ > 400 nm). Photocatalytic activities in NO oxidation reaction exhibited by synthesized titania powders under the irradiation by UV- visible light were higher than the activity of the commercial TiO2 photocatalyst P25 (Degussa). Especially, under illumination by only visible light of above 510 nm wavelength, photocatalytic activity of the obtained specimens exceeded that of P25 more than four times. We also clearly demonstrated that single phase brookite had high photocatalytic activity for NO oxidation.

    Original languageEnglish
    Title of host publicationAdvances in Nanomaterials and Processing - IUMRS - ICA - 2006 International Conference in Asia
    PublisherTrans Tech Publications Ltd
    Number of pages4
    EditionPART 1
    ISBN (Print)3908451310, 9783908451310
    Publication statusPublished - 2007 Jan 1
    EventIUMRS International Conference in Asia 2006, IUMRS-ICA 2006 - Jeju, Korea, Republic of
    Duration: 2006 Sep 102006 Sep 14

    Publication series

    NameSolid State Phenomena
    NumberPART 1
    ISSN (Print)1012-0394


    OtherIUMRS International Conference in Asia 2006, IUMRS-ICA 2006
    Country/TerritoryKorea, Republic of


    • Hydrothermal treatment
    • Novel water-soluble titanium complex
    • Photocatalyst
    • Titanium oxide

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics
    • Materials Science(all)
    • Condensed Matter Physics


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