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Browsing by Author "Guo, Peng-Cheng"

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    Photocatalytic activity enhancement of Bi2WO6 nanoparticles by Gd-doping via microwave assisted method
    (2017-08-01)
    Luc Huy Hoang
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    Nguyen Dang Phu
    ;
    Pham Do Chung
    ;
    Guo, Peng-Cheng
    ;
    Chen, Xiang-Bai
    Gd-doped Bi2WO6 nanoparticles were successfully prepared through microwave assisted synthesis. The incorporation of Gd3+ ions into Bi2WO6 crystallite was analyzed by X-ray diffraction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The optical properties of the nanoparticles were characterized by UV-Vis absorption and photoluminescence spectroscopy. The photocatalytic activity of the nanoparticleswas investigated by degradation of Rhodamine B under visible-light irradiation. Our results showed that Gd-doping plays an important role for enhancing the visible light photocatalytic activity, and the enhanced photocatalytic activity of Gd-doped Bi2WO6 nanoparticles would be mainly correlated with the effective decrease of recombination rate of photogenerated electron-hole pairs.
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    Study of photocatalytic activities of Bi2WO6/BiVO4 nanocomposites
    (2017-09-01)
    Nguyen Dang Phu
    ;
    Luc Huy Hoang
    ;
    Guo, Peng-Cheng
    ;
    Chen, Xiang-Bai
    ;
    Chou, Wu Ching
    The Bi2WO6/BiVO4 nanocomposites were successfully synthesized using fast microwave assisted method. The photocatalytic activities of Bi2WO6/BiVO4 nanocomposites were evaluated by the degradation of Rhodamine B under visible irradiation. The optimal BiVO4 content of 30% was observed for improving the photocatalytic activity of Bi2WO6/BiVO4 nanocomposites, and the mechanism of photocatalytic activity enhancement was investigated. Our results suggest that for the Bi2WO6/BiVO4 nanocomposites, particle surface area plays the most important role for improving photocatalytic activity, and electron-hole recombination rate plays more important role than amount of light absorbed by nanocomposites for improving photocatalytic activity. [GRAPHICS]