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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/10793


    Title: CTAB-assisted hydrothermal synthesis of silver vanadates and their photocatalytic characterization
    Authors: Chao-Ming Huang(黃昭銘)
    Kong-Wei Cheng
    Guan-Ting Pa
    Wen-Sheng Chang
    Thomas C.-K
    Thomas C.K. Yang
    Contributor: 圖書資訊館
    Keywords: Visible-light-driven photocatalyst
    Surface hydroxyl groups
    DRIFTS
    Date: 2010-01
    Issue Date: 2010-09-13 15:22:49 (UTC+8)
    Abstract: Silver vanadates, visible-light-driven photocatalysts, have been synthesized using hydrothermal treatment
    with the assistance of cetyltrimethylammonium bromide (CTAB). It is found that CTAB during the
    hydrothermal synthesis significantly affects the morphology, crystal structure, optical absorbance, and
    photocatalytic properties of silver vanadates. The pure silver vanadate oxides (SVO) consisted of mixed
    structures of Ag4V2O7 and _-Ag3VO4, with _-Ag3VO4 as the major phase. As the amount of CTAB increased,
    the crystal phase of CTAB-SVO sample approached Ag4V2O7. The band gaps for all CTAB-SVO samples
    were found to be in the range of 2.29–2.43 eV. The reactivity of 0.5%CTAB-SVO (surface area, 6.51m2 g−1)
    on isopropanol was 10 times higher than that of P25 (surface area, 49.04m2 g−1) under visible light
    irradiation. The photocatalytic activity of CTAB-SVO sample decreased with an increase of Ag4V2O7. The
    highest photocatalytic activity of 0.5%CTAB-SVO had the highest intensities of surface hydroxyl groups,
    which were detected using the in-situ DRIFT technique. The density of surface hydroxyl groups, not the
    crystalline structure, was confirmed as the key factor influencing the photocatalytic activity.
    Relation: Chemical Engineering Science/ v.65,issue1/ p148-152
    Appears in Collections:[Graduate School and Department of Environmental Engineering] Periodical Articles

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