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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 2
BKCSDE 35(2)
February 20, 2014 

AgI/AgCl/H2WO4 Double Heterojunctions Composites: Preparation and Visible-Light Photocatalytic Performance
Chunping Liu*, Haili Lin, Shanmin Gao*, Ping Yin, Lei Guo, Baibiao Huang, Ying Dai
AgI/AgCl/H2WO4, Heterojunctions, Preparation, Visible light photocatalytic
AgI/AgCl/H2WO4 double heterojunctions photocatalyst was prepared via deposition-precipitation followed by ion exchange method. The structure, crystallinity, morphology, chemical content and other physical-chemical properties of the samples are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray spectra (EDX), UV–vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL). The photocatalytic activity of the AgI/AgCl/H2WO4 was evaluated by degrading methyl orange (MO) under visible light irradiation ( > 400 nm). The double heterojunctions photocatalyst displayed more efficient photocatalytic activity than pure AgI, AgCl, H2WO4 and AgCl/H2WO4. Based on the reactive species and energy band structure, the enhanced photocatalytic activity mechanism of AgI/AgCl/H2WO4 was discussed in detail. The improved photocatalytic performance of AgI/AgCl/H2WO4 double heterojunctions could be ascribed to the enhanced interfacial charge transfer and the inhibited recombination of electron-hole pairs, which was in close relation with the AgI/AgCl/H2WO4 heterojunctions formed between AgI, AgCl and H2WO4.
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