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 contributionpeer-review

20 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
EventIUMRS International Conference in Asia 2006, IUMRS-ICA 2006 - Jeju, Korea, Republic of
Duration: 2006 Sept 102006 Sept 14

Publication series

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


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


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


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