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

    Fingerprint

    tungsten oxides
    replicas
    Tungsten
    phosphates
    Phosphates
    Oxides
    tungsten
    Phosphotungstic Acid
    Crystalline materials
    acids
    Acids
    acetic acid
    Acetic acid
    Energy gap
    templates
    Irradiation
    Decomposition
    decomposition
    Oxidation
    oxidation

    Keywords

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

    ASJC Scopus subject areas

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

    Cite this

    Phosphate constituent effects on the structure and photocatalytic properties of mesoporous tungsten oxides. / Usami, Yoshihiro; Hongo, Teruhisa; Yamazaki, Atsushi.

    In: Microporous and Mesoporous Materials, Vol. 158, 01.08.2012, p. 13-18.

    Research output: Contribution to journalArticle

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