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  • Title: Preparation, characterization and activity evaluation of p-n junction photocatalyst p-CaFe2O4/n-Ag3VO4 under visible light irradiation.
    Author: Shifu C, Wei Z, Wei L, Huaye Z, Xiaoling Y, Yinghao C.
    Journal: J Hazard Mater; 2009 Dec 30; 172(2-3):1415-23. PubMed ID: 19709814.
    Abstract:
    p-n junction photocatalyst p-CaFe(2)O(4)/n-Ag(3)VO(4) was prepared by ball milling Ag(3)VO(4) in H(2)O doped with p-type CaFe(2)O(4). The structural and optical properties of the photocatalyst were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and UV-vis diffuse reflection spectrum (DRS). The photocatalytic activity was evaluated by photocatalytic degradation of methylene blue (MB) under visible light irradiation. The results showed that the photocatalytic activity of the p-CaFe(2)O(4)/n-Ag(3)VO(4) was higher than that of Ag(3)VO(4). When the amount of doped p-CaFe(2)O(4) was 2.0 wt.% and the p-CaFe(2)O(4)/n-Ag(3)VO(4) was ball milled for 12h, the photocatalytic degradation efficiency was 85.4%. Effect of ball milling time on the photocatalytic activity of the photocatalyst was also investigated. The mechanisms of the increase in the photocatalytic activity were discussed by the p-n junction principle.
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