Preparation of a reduced layered tungstic acid H xW 2O 7 via acid treatment of Bi 2W 2O 9 in the presence of Sn 2+ ions

Seiichi Tahara, Takakazu Minato, Nobuhiro Kumada, Shigenobu Hayashi, Yoshiyuki Sugahara

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    A reduced layered tungstic acid with a double-octahedral structure was prepared by acid treatment of Aurivillius-type Bi 2W 2O 9 in the presence of Sn 2+ ions. While the color of the product formed by acid treatment with no Sn 2+ ions present, H2W2O7, was yellow, a blue powder was obtained after the acid treatment in the presence of Sn 2+ ions. No notable change in the morphology was observed after acid treatment. The X-ray diffraction pattern of the product acid-treated in the presence of Sn 2+ ions was very similar to that of H 2W 2O 7. Essentially all the Bi 3+ ions were lost upon acid treatment, indicating the occurrence of selective leaching of bismuth oxide sheets in Bi 2W 2O 9. A UV-visible absorption spectrum and XPS analysis demonstrated that the W 6+ ions were partially reduced to W 5+ ions, and the number of protons in the product was correspondingly 2.4 per [W 2O 7]. These results suggest the successful formation of a reduced layered tungstic acid, H 2.4W 2O 7.

    Original languageEnglish
    Title of host publicationMaterials Research Society Symposium Proceedings
    Pages246-251
    Number of pages6
    Volume1056
    Publication statusPublished - 2008
    EventNanophase and Nanocomposite Materials V - Boston, MA, United States
    Duration: 2007 Nov 262007 Nov 30

    Other

    OtherNanophase and Nanocomposite Materials V
    CountryUnited States
    CityBoston, MA
    Period07/11/2607/11/30

    Fingerprint

    Ions
    preparation
    acids
    Acids
    ions
    products
    bismuth oxides
    tungstic(VI) acid
    Powders
    Diffraction patterns
    leaching
    Leaching
    visible spectrum
    Bismuth
    Protons
    Absorption spectra
    X ray photoelectron spectroscopy
    spectrum analysis
    diffraction patterns
    Color

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering
    • Mechanics of Materials

    Cite this

    Tahara, S., Minato, T., Kumada, N., Hayashi, S., & Sugahara, Y. (2008). Preparation of a reduced layered tungstic acid H xW 2O 7 via acid treatment of Bi 2W 2O 9 in the presence of Sn 2+ ions In Materials Research Society Symposium Proceedings (Vol. 1056, pp. 246-251)

    Preparation of a reduced layered tungstic acid H xW 2O 7 via acid treatment of Bi 2W 2O 9 in the presence of Sn 2+ ions . / Tahara, Seiichi; Minato, Takakazu; Kumada, Nobuhiro; Hayashi, Shigenobu; Sugahara, Yoshiyuki.

    Materials Research Society Symposium Proceedings. Vol. 1056 2008. p. 246-251.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Tahara, S, Minato, T, Kumada, N, Hayashi, S & Sugahara, Y 2008, Preparation of a reduced layered tungstic acid H xW 2O 7 via acid treatment of Bi 2W 2O 9 in the presence of Sn 2+ ions in Materials Research Society Symposium Proceedings. vol. 1056, pp. 246-251, Nanophase and Nanocomposite Materials V, Boston, MA, United States, 07/11/26.
    Tahara S, Minato T, Kumada N, Hayashi S, Sugahara Y. Preparation of a reduced layered tungstic acid H xW 2O 7 via acid treatment of Bi 2W 2O 9 in the presence of Sn 2+ ions In Materials Research Society Symposium Proceedings. Vol. 1056. 2008. p. 246-251
    Tahara, Seiichi ; Minato, Takakazu ; Kumada, Nobuhiro ; Hayashi, Shigenobu ; Sugahara, Yoshiyuki. / Preparation of a reduced layered tungstic acid H xW 2O 7 via acid treatment of Bi 2W 2O 9 in the presence of Sn 2+ ions Materials Research Society Symposium Proceedings. Vol. 1056 2008. pp. 246-251
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    abstract = "A reduced layered tungstic acid with a double-octahedral structure was prepared by acid treatment of Aurivillius-type Bi 2W 2O 9 in the presence of Sn 2+ ions. While the color of the product formed by acid treatment with no Sn 2+ ions present, H2W2O7, was yellow, a blue powder was obtained after the acid treatment in the presence of Sn 2+ ions. No notable change in the morphology was observed after acid treatment. The X-ray diffraction pattern of the product acid-treated in the presence of Sn 2+ ions was very similar to that of H 2W 2O 7. Essentially all the Bi 3+ ions were lost upon acid treatment, indicating the occurrence of selective leaching of bismuth oxide sheets in Bi 2W 2O 9. A UV-visible absorption spectrum and XPS analysis demonstrated that the W 6+ ions were partially reduced to W 5+ ions, and the number of protons in the product was correspondingly 2.4 per [W 2O 7]. These results suggest the successful formation of a reduced layered tungstic acid, H 2.4W 2O 7.",
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    AU - Hayashi, Shigenobu

    AU - Sugahara, Yoshiyuki

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    AB - A reduced layered tungstic acid with a double-octahedral structure was prepared by acid treatment of Aurivillius-type Bi 2W 2O 9 in the presence of Sn 2+ ions. While the color of the product formed by acid treatment with no Sn 2+ ions present, H2W2O7, was yellow, a blue powder was obtained after the acid treatment in the presence of Sn 2+ ions. No notable change in the morphology was observed after acid treatment. The X-ray diffraction pattern of the product acid-treated in the presence of Sn 2+ ions was very similar to that of H 2W 2O 7. Essentially all the Bi 3+ ions were lost upon acid treatment, indicating the occurrence of selective leaching of bismuth oxide sheets in Bi 2W 2O 9. A UV-visible absorption spectrum and XPS analysis demonstrated that the W 6+ ions were partially reduced to W 5+ ions, and the number of protons in the product was correspondingly 2.4 per [W 2O 7]. These results suggest the successful formation of a reduced layered tungstic acid, H 2.4W 2O 7.

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