Flower-like Bi2WO6/ZnO composite with excellent photocatalytic capability under visible light irradiation

doi:10.1016/S1872-2067(17)63004-3

Abstract

Abstract:

The photocatalytic ability of ZnO is improved through the addition of flower-like Bi₂WO₆ to prepare a Bi₂WO₆/ZnO composite with visible light activity. The composite is characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy with UV-vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy and N₂ adsorption-desorption isotherms. After modification, the band gap energy of Bi₂WO₆/ZnO is reduced from 3.2 eV for ZnO to 2.6 eV. Under visible light irradiation, the Bi₂WO₆/ZnO composite shows an excellent photocatalytic activity for degrading methylene blue (MB) and tetracycline. The photo-degradation efficiencies of (0.3:1) Bi₂WO₆/ZnO for MB and tetracycline are approximately 246 and 4500 times higher than those of bare ZnO, respectively, and correspondingly, the photo-degradation rates for the two pollutants are approximately 120 and 200 times higher than those with bare ZnO, respectively. Moreover, the photocatalyst of (0.3:1) Bi₂WO₆/ZnO exhibits a higher transient photocurrent density of approximately 4.5 μA compared with those of bare Bi₂WO₆ and ZnO nanoparticles. The successful recombination of Bi₂WO₆ and ZnO enhances the photocatalytic activity and reduces the band gap energy of ZnO, which can be attributed to the effective separation of electron-hole pairs. Active species trapping experiments display that[O₂]^- is the major species involved during photocatalysis rather than·OH and h⁺. This study provides insight into designing a meaningful visible-light-driven photocatalyst for environmental remediation.

Key words: Bismuth tungstate, Zinc oxide, Photocatalysis, Methylene blue, Antibiotics

Juan Cheng, Yi Shen, Kuan Chen, Xi Wang, Yongfu Guo, Xiaoji Zhou, Renbi Bai. Flower-like Bi₂WO₆/ZnO composite with excellent photocatalytic capability under visible light irradiation[J]. Chinese Journal of Catalysis, 2018, 39(4): 810-820.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(17)63004-3

https://www.cjcatal.com/EN/Y2018/V39/I4/810

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Flower-like Bi₂WO₆/ZnO composite with excellent photocatalytic capability under visible light irradiation

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