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Browsing by Author "Kong, Meng-Hong"

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    Control of crystal phase of BiVO4 nanoparticles synthesized by microwave assisted method
    (2016-06)
    Nguyen Dang Phu
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    Luc Huy Hoang
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    Pham Khac Vu
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    Kong, Meng-Hong
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    Chen, Xiang-Bai
    Different crystalline phases BiVO4 nanoparticles (tetragonal-zircon, monoclinic-scheelite, and tetragonal-zircon/monoclinic-scheelite heterophase) have been prepared by fast microwave assisted method and annealing treatment. For the heterophase, the ratio of tetragonal-zircon and monoclinic-scheelite phases can be well controlled by controlling the annealing temperature. Furthermore, a tight interface junction has been formed between tetragonal-zircon BiVO4 and monoclinic-scheelite BiVO4 in a nanosize level. This tight interface junction can modify the electronic structure of BiVO4 nanoparticles, which would be very helpful for achieving high photocatalytic activity.
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    Study of photocatalytic activities of Bi2WO6 nanoparticles synthesized by fast microwave-assisted method
    (2015-10-25)
    Nguyen Dang Phu
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    Hoang, Luc Huy
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    Chen, Xiang-Bai
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    Kong, Meng-Hong
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    Wen, Hua-Chiang
    We present a study of photocatalytic activities of Bi2WO6 nanoparticles synthesized by fast microwave-assisted method. The photocatalytic activities of the nanoparticles were evaluated by the decolorization of methylene-blue under visible-light-irradiation. Our results show that the surface area of Bi2WO6 nanoparticles plays a major role for improving photocatalytic activity, while visible-light absorption has only a weak effect on photocatalytic activity. This suggests efficient transportation of photo-generated electrons and holes to the oxidation active sites on the surface of nanoparticles, indicating Bi2WO6 nanoparticles synthesized by fast microwave-assisted method are promising for achieving high photocatalytic activity under visible-light-irradiation. (C) 2015 Elsevier B.V. All rights reserved.