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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/10794

    Title: In situ DRIFT and kinetic studies of photocatalytic degradation on benzene vapor with visible-light-driven silver vanadates
    Authors: Lung-Chuan Chen
    Guan-Ting Pan
    Thomas C.-K. Yang
    Tsair-Wang Chung
    Chao-Ming Huang(黃昭銘)
    Contributor: 圖書資訊館
    Keywords: Photocatalyst
    Visible-light irradiation
    Date: 2010
    Issue Date: 2010-09-13 15:26:31 (UTC+8)
    Abstract: The visible-light active silver vanadates with different types of crystallines (Ag4V2O7 and Ag3VO4 phases)
    were synthesized by an environmentally friendly aqueous process. The parameters of hydrothermal
    temperature and hydrothermal time were tuned to maximize the photocatalytic efficiency for the decomposition
    of benzene vapor under visible-light irradiation. The quantum efficiencies of the photocatalysts
    are compared on the basis of the crystalline phases, surface area, intensity of surface hydroxyl groups, and
    Bronsted acid sites. From the results of DRIFTS studies, the photocatalytic activities strongly depend on
    the intensities of the Bronsted acidity and hydroxyl groups presented on the silver vanadates. The sample
    synthesized at 140 ◦C and 4 h (HM140) exhibits the best photocatalytic activity; it has a reaction rate
    constant (kapp) of 1.42 min−1, much higher than that of P25 (kapp = 0.13 min−1). For an irradiation time of
    720 min, the mineralization yields of benzene were 48% and 11% for HM140 and P25, respectively. Based
    on the short-term decrease of benzene concentration and the long-term increase of CO2 concentration,
    the photocatalytic ability of the HM140 sample is significantly superior to that of P25. The highest activity
    can be attributed to the synergetic effects of the richest Bronsted acid sites, and a favorable crystalline
    phase combined with abundant surface hydroxyl groups.
    Relation: Journal of Hazardous Materials/p 644–651
    Appears in Collections:[環境工程系所] 期刊論文

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