可见光响应的Co3(PO4)2/Ag3PO4纳米复合光催化剂的制备及表征

doi:10.3866/PKU.WHXB201408046

Abstract

Abstract:

In this study, Ag₃PO₄ nanoparticles (NPs), cobalt phosphate (Co₃(PO₄)₂, CoP) nanosheets (NSs), and their composites (CoP/Ag₃PO₄) were synthesized via a facile chemical precipitation method. Their visiblelight photocatalytic activities were compared and investigated. The structural, morphological, optical, and visiblelight photocatalytic properties of the prepared samples were characterized by X-ray diffraction (XRD), fieldemission scanning electron microscopy (FESEM), ultraviolet- visible (UV- Vis) diffuse absorbance and photoluminescence (PL) spectroscopies. We found that both the degradation rate and cyclical stability of the CoP/Ag₃PO₄ hybrids increased significantly under visible-light irradiation when methyl orange (MO) was used as the target with reference to single-phase Ag₃PO₄ NPs or CoP NSs. This suggests that CoP might play a cocatalyst role, which suppresses carrier recombination and provides a large number of photogenerated holes. Additionally, we also observed that the CoP/Ag₃PO₄ hybrids hardly degraded Rhodamine B (RhB), a cationic dye. This behavior might be attributed to the lower amount of dye molecule absorption because of a change in surface polarity. We thus present a new approach for the development of low-cost and visible-light responsive photocatalysts.

Key words: Ag₃PO₄, Co₃(PO₄)₂, Visible-light photocatalysis, Methyl orange, Rhodamine B

GU Yong-Qin, WANG Bo, GU Xiu-Quan, ZHAO Yu-Long, QIANG Ying-Huai, ZHANG Shuang, ZHU Lei. Preparation and Characterization of Co₃(PO₄)₂/Ag₃PO₄ Nanocomposites for Visible-Light Photocatalysis[J]. Acta Phys. -Chim. Sin. 2014, 30(10), 1909-1915. doi: 10.3866/PKU.WHXB201408046

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Preparation and Characterization of Co₃(PO₄)₂/Ag₃PO₄ Nanocomposites for Visible-Light Photocatalysis

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Preparation and Characterization of Co₃(PO₄)₂/Ag₃PO₄ Nanocomposites for Visible-Light Photocatalysis