Abstract
In this article, the Bi2WO6 powder was prepared by the solid-state reaction method. The p–n heterojunction photocatalyst CuBi2O4/Bi2WO6 was prepared by ball milling through doping CuBi2O4 into Bi2WO6. The photocatalyst was characterised by X-ray powder diffraction (XRD), UV-Vis diffuse reflectance spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence emission spectra. The results showed that the photocatalytic activity of CuBi2O4/Bi2WO6 was much higher than that of Bi2WO6 on the photocatalytic reduction of . However, the photocatalytic activity of the photocatalyst was much lower than that of Bi2WO6 on the photocatalytic oxidation of methylene blue (MB). For the photocatalytic reduction of , the optimum amount of doped CuBi2O4 is 1.0 wt%. Compared with the pure Bi2WO6, the photoabsorption wavelength range of the photocatalyst is extended greatly towards visible light and improves the utilisation of the total spectrum. The effect of the ball milling time on the photocatalytic activity of the photocatalyst was also investigated. The optimum ball milling time is 6 h. The mechanisms of the increase in the photocatalytic activity were discussed by the p–n junction principle and the valance band theory.
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