Preparation of N-Doped Bi2WO6 Microspheres for Efficient Visible Light-Induced Photocatalysis

doi:10.1007/s40195-013-0009-z

Abstract

Abstract:

The N-doped bismuth tungstate (Bi₂WO₆) photocatalysts with high visible light activity were prepared by the hydrothermal method using urea as a nitrogen source. The as-prepared N-doped Bi₂WO₆ samples were characterized by X-ray diffraction, scanning electron microscopy, specific surface area, photocurrent analysis, and UV–Vis diffuse reflectrance spectroscopy. The photocatalytic activity was evaluated by photocatalytic degradation of rhodamine B (RhB) solution under visible light irradiation. The photocatalytic mechanisms were analyzed by active species trapping experiments which revealed that the holes were the main active species of N-doped Bi₂WO₆ products in aqueous solution under visible light irradiation, rather than ·OH and O₂^?-. With the assistance of H₂O₂, the photocatalytic activity for degradation of RhB could be further improved because H₂O₂ reacted with conduction band electrons to generate more hydroxyl radicals.

Key words: Hydrothermal method, Photocatalysis, Microstructure and property

Bolin Tang, Guohua Jiang, Zhen Wei, Xia Li, Xiaohong Wang, Tengteng Jiang, Wenxing Chen, Junmin Wan. Preparation of N-Doped Bi₂WO₆ Microspheres for Efficient Visible Light-Induced Photocatalysis[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(1): 124-130.

Figures/Tables 5

Fig. 1 SEM images of pure Bi2WO6 microspheres (RN = 0) a and Bi2WO6 microspheres with different nitrogen-doping concentrations (RN = 0.5 b, 1.0 c, 1.5 d , 2.0 e, f) prepared under the same conditions

Fig. 2 SEM images of N-doped Bi2WO6 products with reaction times for 1 h a, 6 h b, 17 h c, 24 h d with the controlled atomic ratio of N to Bi at 2.0

Fig. 3 XRD patterns a and N2 absorption–desorption isotherms curves b of pure Bi2WO6 and N-doping Bi2WO6 products with RN = 0.5, 1.0 and 1.5, respectively

Fig. 4 a UV–Vis diffusion reflectance spectra of Bi2WO6 samples with different RN values (the inset showing the relationship between (αhν)2 and photon energy) b photocurrent generated with visible light irradiation time over doped and undoped samples

Fig. 5 Photocatalytic activities of blank sample and various N-doped Bi2WO6 samples with different N-doping Bi2WO6 products a and trapping experiment of active species during the photocatalytic reaction using 0.5% N-doped Bi2WO6 as catalyst b

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Preparation of N-Doped Bi₂WO₆ Microspheres for Efficient Visible Light-Induced Photocatalysis

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