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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/5789


    Title: Crystalline phases and photocatalytic activities of hydrothermal synthesis Ag3VO4 and Ag4V2O7 under visible light irradiation
    Authors: Chao-Ming Huang(黃昭銘)
    Guan-Ting Pan
    Yu-Chu M. Li
    Min-Hsing Li
    Thomas C.-K. Yang
    Keywords: Ag3VO4
    Ag4V2O7
    Visible-light-driven photocatalyst
    DRIFT technique
    Surface hydroxyl group
    Date: 2009
    Issue Date: 2009-11-18 09:16:01 (UTC+8)
    Abstract: Visible-light-driven silver vanadate photocatalysts were successfully synthesized using a lowtemperature
    hydrothermal synthesis method. Under various hydrothermal conditions, the structures
    of silver vanadates were tuned by changing the hydrothermal time and with the assistance of a
    surfactant. X-ray diffraction (XRD) results reveal that the hydrothermal synthesis powders consisted of
    three kinds of phase: pure Ag4V2O7 or pure a-Ag3VO4 or mixed phases of Ag4V2O7 and a-Ag3VO4. UV–vis
    spectroscopy indicated that silver vanadate particles had strong visible light absorption with associated
    band gaps in the range of 2.2–2.5 eV. The powder synthesized at 140 8C for 4 h (HT4) exhibited the
    highest photocatalytic activity among all samples. The reactivity of HT4 (surface area, 2.04 m2 g1) on
    isopropanol and benzene was 16.6 and 16.2 times higher than those of P25 (surface area, 49.04 m2 g1)
    under visible light irradiation. The enhanced photocatalytic activity of HT4 is attributed to mixed
    crystalline phases of Ag4V2O7 and a-Ag3VO4, where a-Ag3VO4 is the major component. In addition, the
    highest large amount of hydroxyl groups on the surface of a-Ag3VO4, detected by the in situ FT-IR diffuse
    reflectance (DRIFT) technique, was considered as the other factor. Detailed DRIFT experiments also
    revealed that the stability of Brønsted acid sites of HT4 was excellent, as confirmed by NH3 adsorption.
    Studies of crystalline phase and surface property showed that the photocatalytic activities of the
    hydrothermal synthesis of silver vanadates are strongly affected by hydrothermal time. Besides, the
    amount of surface hydroxyl groups and the crystallinity of a-Ag3VO4 phase were verified to be the key
    factors influencing photocatalytic activity.
    Appears in Collections:[環境工程系所] 期刊論文

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