Paper Title:

Hydrothermal Synthesis of Nanosized Titania Photocatalysts Using Novel Water-Soluble Titanium Complexes

Periodical Solid State Phenomena (Volumes 124 - 126)
Main Theme Advances in Nanomaterials and Processing
Edited by Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park
Pages 723-726
DOI 10.4028/
Citation Makoto Kobayashi et al., 2007, Solid State Phenomena, 124-126, 723
Online since June, 2007
Authors Makoto Kobayashi, Koji Tomita, Valery Petrykin, Shu Yin, Tsugio Sato, Masahiro Yoshimura, Masato Kakihana
Keywords Hydrothermal Treatment, Novel Water-Soluble Titanuim Complex, Photocatalytic, Titanium Oxide
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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.

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