Phosphate constituent effects on the structure and photocatalytic properties of mesoporous tungsten oxides

Yoshihiro Usami, Teruhisa Hongo, Atsushi Yamazaki

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Mesoporous WO 3 replicas were synthesized by a hard template method using ammonium metatungstate (AMT) or phosphotungstic acid (PTA) as a tungsten source. The mesoporous WO 3 replica synthesized from AMT (WO 3-AMT) and PTA (WO 3-PTA) consisted of a crystalline monoclinic phase and mixed crystalline tetragonal and monoclinic phases, respectively. The absorption of WO 3-PTA in the visible region was stronger than that of WO 3-AMT. These characteristics reflected the oxidation states, which were affected by the existence or non-existence of minor phosphate constituents in the mesoporous WO 3 replica. WO 3-PTA contained a phosphate constituent from the tungsten source. However, WO 3-AMT and WO 3-PTA have similar mesostructures and band-gap energies. WO 3-AMT and WO 3-PTA with Cu 2+ ions showed 28.4 and 5.5 times higher photocatalytic activities than that of bare commercial TiO 2 (P-25) in decomposition of acetic acid under visible-light irradiation. The phosphate in WO 3-PTA functioned as a recombination center.

Original languageEnglish
Pages (from-to)13-18
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume158
DOIs
Publication statusPublished - 2012 Aug 1

Keywords

  • Cu ions
  • Hard template method
  • Mesoporous tungsten oxide
  • Phosphate
  • Photocatalytic activity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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