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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/12049

    Title: In-situ DRIFT study of photocatalytic degradation of gaseous isopropanol over BiVO4 under indoor illumination
    Authors: Chao-Ming Huang(黃昭銘)
    Guan-Ting Pan
    Po-Yang Peng
    Thomas C.-K. Yang
    Keywords: BiVO4
    Visible-light-driven photocatalyst
    Surface hydroxyl groups
    Date: 2010-07
    Issue Date: 2010-11-24 14:06:51 (UTC+8)
    Abstract: Visible-light-driven bismuth vanadate photocatalysts were synthesized using a homogeneous coprecipitation
    process. X-ray diffraction (XRD) results reveal that the obtained powders consisted of
    monoclinic BiVO4. Surface characterizations by XPS and diffuse reflectance infrared Fourier transform
    spectroscopy (DRIFTS) confirm the presence of surface hydroxyl groups on BiVO4. The effect of adsorption
    ability on photocatalytic activity of BiVO4 was investigated by isopropanol (IPA) adsorption and
    DRIFTS. All BiVO4 samples exhibited a higher level of activity than that of a commercial TiO2 photocatalyst
    (P25). The FTIR spectra verifying the high photocatalytic performance of BiVO4 can be attributed to
    the rich surface hydroxyl groups that favor the high adsorption of IPA. The sample synthesized at 90 ◦C
    for 24 h (BV24) exhibits the best photocatalytic activity as evaluated using the apparent rate constant
    for initial photodegradation of gaseous IPA and the mineralization yield after long-term light irradiation.
    For an irradiation time of 720 min, the mineralization yields of IPA were 88% and 41% for BV24
    and P25, respectively. This high visible-light photoactivity was ascribed to high adsorption ability, high
    crystallization, and large surface hydroxyl groups.
    Appears in Collections:[環境工程系所] 期刊論文

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