Preparation and Photocatalytic Activity of Cu-doped BiVO4 Photocatalysts Fabricated by Hydrothermal Method

doi:10.3724/SP.J.1077.2012.00019

Abstract

Abstract:

Cu-BiVO₄ photocatalysts were prepared by hydrothermal method using Bi(NO₃)₃·5H₂O, NH₄VO₃ and Cu(NO₃)₂·3H₂O as raw materials. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscope (XPS) and UV-Vis diffusion reflectance spectra (UV-Vis). The results show that highly crystalline monoclinic scheelite structure of Cu-BiVO₄ is obtained by increasing the pH value, and the crystal structures of BiVO₄ are no change with the increasing of Cu dopant. XPS results reveal that the doped Cu species exists in the form of CuO and Cu₂O. The Cu-BiVO₄ catalyst has a significant red-shift in the absorption band in the visible region, and the absorption intensity increases greatly for the composite catalyst compared with pure BiVO₄. The Cu-BiVO₄ photocatalysts enhance the photocatalytic activities for degradation of methylene blue (MB) under visible light irradiation. When pH value is 5.0 and Cu dopant is 1.0wt%, the photocatalytic activities reach the maximum. After visible light irradiation for 60 min, the removal rate of MB by Cu-BiVO₄(1.0wt% Cu) at 10 mg/L initial concentration increases to 97.8% while the removal rate of MB by pure BiVO₄ is only 54.7%. The mechanism of enhanced photocatalytic activity is also discussed.

Key words: hydrothermal method, Cu-BiVO₄, photocatalytic, methylene blue, preparation

CLC Number:

O643

CHEN Yuan, ZHOU Ke-Chao, HUANG Su-Ping, LI Zhi-You, LIU Guo-Cong. Preparation and Photocatalytic Activity of Cu-doped BiVO₄ Photocatalysts Fabricated by Hydrothermal Method[J]. Journal of Inorganic Materials, 2012, 27(1): 19-25.

Figures/Tables 8

Fig. 1 XRD patterns of Cu-BiVO4 samples prepared under different pH values

Fig. 2 SEM images and EDS spectrum of Cu-BiVO4 samples prepared under different pH values

Fig. 3 XRD patterns of of Cu/BiVO4 samples doped with different Cu amounts

Fig. 4 SEM images of Cu-BiVO4 samples doped with different Cu amounts

Fig. 5 XPS spectra of Cu-BiVO4 (5.0wt% Cu)

Fig. 6 (a) UV-Vis diffuse reflectance spectra of Cu-BiVO4 samples doped with different Cu amounts, (b) band gap of photocatalysts

Fig. 7 Effects of Cu dopants in the Cu/BiVO4 on MB degradation efficiency

Fig. 8 Absorbance changes of MB under visible-light irradiation

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Preparation and Photocatalytic Activity of Cu-doped BiVO₄ Photocatalysts Fabricated by Hydrothermal Method

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