Efficient Photocatalytic Degradation of Phenol over Co3O4/BiVO4 Composite under Visible Light Irradiation

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• 作者：Mingce Long ; Weimin Cai ; Jun Cai ; Baoxue Zhou ; Xinye Chai ; Yahui Wu
• 刊名：Journal of Physical Chemistry B
• 出版年：2006
• 出版时间：October 19, 2006
• 年：2006
• 卷：110
• 期：41
• 页码：20211 - 20216
• 全文大小：201K
• 年卷期：v.110,no.41(October 19, 2006)
• ISSN：1520-5207

文摘

Co₃O₄/BiVO₄ composite photocatalyst with a p-n heterojunction semiconductor structure has been synthesizedby the impregnation method. The physical and photophysical properties of the composite photocatalyst havebeen characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transimission electronmicroscopy (TEM), BET surface area, and UV-visible diffuse reflectance spectra. Co is present as p-typeCo₃O₄ and disperses on the surface of n-type BiVO₄ to constitute a heterojunction composite. The photocatalystexhibits enhanced photocatalytic activity for phenol degradation under visible light irradiation. The highestefficiency is observed when calcined at 300 C with 0.8 wt % cobalt content. On the basis of the calculatedenergy band positions and PL spectra, the mechanism of enhanced photocatalytic activity has been discussed.