Citation:
Hongbo He, Shuangshuang Xue, Zhen Wu, Changlin Yu, Kai Yang, Guiming Peng, Wanqin Zhou, Dehao Li. Sonochemical fabrication, characterization and enhanced photocatalytic performance of Ag2S/Ag2WO4 composite microrods[J]. Chinese Journal of Catalysis,
;2016, 37(11): 1841-1850.
doi:
10.1016/S1872-2067(16)62515-9
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Ag2S/Ag2WO4 composite microrods, with lengths of 0.2-1 μm and diameters of 20-30 nm, were fabricated by a facile sonochemical route. The as-synthesized products were intensively investigat-ed by a series of physicochemical characterizations, such as N2 physical adsorption, X-ray diffrac-tion, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, diffuser reflectance spectroscopy, X-ray photoelectron spectroscopy, photolumines-cence spectroscopy and photocurrent response measurements. Ultrasonic irradiation yields an obvious improvement in the photocatalyst texture, for example, an increase in crystallinity and surface area. Moreover, sonochemically fabricated Ag2S/Ag2WO4 microrods display strong visible light absorption and a high transient photocurrent response. The produced intimate Ag2S/Ag2WO4 interface between Ag2S and Ag2WO4 crystal phases largely promotes the separation of photogener-ated holes and electrons. High photocatalytic activity and stability were obtained over Ag2S/Ag2WO4 composite microrods. The dye degradation rate constant of Ag2S/Ag2WO4 was 4.7 times and 29.8 times higher than that of bare Ag2WO4 and Ag2S, respectively.
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Keywords:
- Sonochemistry,
- Microrod,
- Silver tungstate,
- Photocatalysis,
- Heterojunction
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