Photocatalytic oxidation of natural organic adsorbates on anatase TiO 2 films observed by infrared adsorption spectroscopy with a multiple internal reflection geometry

F. Hirose, M. Kurita, Y. Kimura, M. Niwano

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Photocatalytic oxidation of organic adsorbates on anatase TiO 2 films has been examined in different atmospheres of humid air, dry air and vacuum. The photocatalytic oxidation was observed by IR absorption spectroscopy (IRAS) with a multiple-internal-reflection (MIR) geometry. The photocatalytic oxidation is the fastest in the air at a humidity of 70% where oxygen and water vapor are consuming to produce OH radicals and O 2 - anions on the TiO 2 surface with the UV exposure. In the dry air, a rate of the photocatalytic oxidation is almost 30% of that in the humid air, where only O 2 - anions oxidize the organic adsorbates. In vacuum, on the other hand, it is negligible, which suggests that adsorbed H 2 O molecules do not play an important role in the photocatalytic reaction. It is suggested that an addition of the water vapor is necessary to achieve the higher catalytic activity.

Original languageEnglish
Pages (from-to)1912-1916
Number of pages5
JournalApplied Surface Science
Volume253
Issue number4
DOIs
Publication statusPublished - 2006 Dec 15

Keywords

  • FTIR
  • Photocatalyst
  • TiO

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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