Photocatalytic behavior of titanium oxide-perovskite type Sr(Zr 1-x Y x )O 3-δ composite particles

Takahisa Omata, Shinya Otsuka-Yao-Matsuo

研究成果: Article査読

24 被引用数 (Scopus)

抄録

Photocatalytic reactions sensitized by composite particles have been examined, which are composed of titanium dioxide and acceptor-doped perovskite involving alkali-earth elements. Although the photocatalytic activity of perovskite-type oxide Sr(Zr 0.90 Y 0.10 )O 3-δ being p-type conductor is weak, it absorbs light with wavelength of λ<800 nm. Titanium dioxide (TiO 2 ) being n-type conductor exhibits a fairly high photocatalytic activity; however, it does not absorb visible light. Under the irradiation of Xe discharge light, the composite particles involving the pn-junction exerted several times higher photocatalytic activity in photodegradation of methylene blue than a sole TiO 2 . Similar results were obtained for the composite powders of Sr(Zr 0.95 Y 0.05 )O 3-δ , Ca(Zr 0.95 Y 0.10 )O 3-δ and Ca(Zr 0.95 Ga 0.05 )O 3-δ with TiO 2 , respectively. Under the irradiation of visible light with wavelength of λ > 420 nm, it was found that the photodegradation of methylene blue and HCOOH aqueous solutions proceeded. These results may be explained by a model for the flow of the photogenerated electrons and holes through the pn-junctions in the composite particles.

本文言語English
ページ(範囲)243-248
ページ数6
ジャーナルJournal of Photochemistry and Photobiology A: Chemistry
156
1-3
DOI
出版ステータスPublished - 2003 3 20
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)
  • 物理学および天文学(全般)

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