Sonochemical fabrication, characterization and enhanced photocatalytic performance of Ag2S/Ag2WO4 composite microrods

doi:10.1016/S1872-2067(16)62515-9

Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (11): 1841-1850.DOI: 10.1016/S1872-2067(16)62515-9

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Sonochemical fabrication, characterization and enhanced photocatalytic performance of Ag₂S/Ag₂WO₄ composite microrods

Hongbo He^a, Shuangshuang Xue^a, Zhen Wu^a, Changlin Yu^a, Kai Yang^a, Guiming Peng^a, Wanqin Zhou^a, Dehao Li^b

a School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China;
b Faculty of Environmental and Biological Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, Guangdong, China

Received:2016-05-27 Revised:2016-07-22 Online:2016-11-25 Published:2016-11-25
Contact: Changlin Yu,Tel/Fax:+86-797-8312334; E-mail:yuchanglinjx@163.com;Dehao Li, E-mail:dehlee@163.com
Supported by:
This work was supported by the National Natural Science Foundation of China (21567008, 21263005), the Yangfan Project of Guangdong Province, the Natural Science Foundation of Jiangxi Province (20133BAB21003, 20161BAB203090), the Landing Project of Science and Technology of Colleges and Universities in Jiangxi Province (KJLD14046), and the Graduate Innovation Project of Jiangxi Province (YC2015-S293).

Abstract

Abstract:

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.

Key words: Sonochemistry, Microrod, Silver tungstate, Photocatalysis, Heterojunction

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.

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Sonochemical fabrication, characterization and enhanced photocatalytic performance of Ag₂S/Ag₂WO₄ composite microrods

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