Photoreduction of nitrate ion and photoevolution of hydrogen on unsupported TiO2 and TiO2 pillared H4Nb6O17 nanocomposites

S. Tawkaew, Shu Yin, Tsugio Sato

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36 Citations (Scopus)

Abstract

The photocatalytic evolution of hydrogen gas and reduction of nitrate ion were performed under irradiation of near UV-visible light (λ>290 nm) in the presence of photocatalysts such TiO2 (Degussa-P25), TiO/Pt, H4Nb6O17, H4Nb6O17/Pt, H4Nb6O17/TiO2 and H4Nb6O17/(Pt, TiO2) in aqueous methanol solution at 60°C. The hydrogen production activity was in the order H4Nb6O17/(Pt, TiO2)>H4 Nb6O17 /Pt>TiO2/Pt>H4 Nb6O17/TiO2 >H4Nb6O17>TiO2. The catalysts possessing high hydrogen evolution activity such as H4Nb6O17/(Pt, TiO2), H4Nb6O17/Pt, TiO2/Pt and H4Nb6O17/TiO2 showed no noticeable nitrate reducing activity. Consequently, only TiO2 and H4NB6O17 showed the nitrate ion photoreduction activity.

Original languageEnglish
Pages (from-to)855-859
Number of pages5
JournalInternational Journal of Inorganic Materials
Volume3
Issue number7
DOIs
Publication statusPublished - 2001 Jan 1

Keywords

  • Hydrogen evolution
  • Layered niobate
  • Nitrate reduction
  • Photocatalytic reaction
  • Semiconductor pillar
  • Titania

ASJC Scopus subject areas

  • Materials Chemistry

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