Construction of Ag3PO4/Ag2MoO4 Z-scheme heterogeneous photocatalyst for the remediation of organic pollutants

doi:10.1016/S1872-2067(16)62570-6

Abstract

Abstract:

Hole/electron separation and charge transfer are the key processes for enhancing the visible-light photocatalysis performance of heterogeneous photocatalytic systems. To better utilize and understand these effects, binary Ag₃PO₄/Ag₂MoO₄ hybrid materials were fabricated by a facile solution-phase reaction and characterized systematically by X-ray diffraction (XRD), energy-dispersive spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, field-emission scanning electron microscopy and ultraviolet-visible diffuse-reflectance spectroscopy. Under visible-light illumination, a heterogeneous Ag₃PO₄/Ag/Ag₂MoO₄ photocatalyst was constructed and demonstrated enhanced photocatalytic activity and photostability compared with pristine Ag₃PO₄ toward the remediation of the organic dye rhodamine B. The Ag₃PO₄/Ag₂MoO₄ hybrid catalyst with 8% mole fraction of Ag₂MoO₄ exhibited the highest photocatalytic activity toward the removal of typical dye molecules, including methyl orange, methylene blue and phenol aqueous solution. Moreover, the mechanism of the photocatalytic enhancement was investigated via hole- and radical-trapping experiments, photocurrent measurements, electrochemical impedance spectroscopy and XRD measurements. The XRD analysis revealed that metallic Ag nanoparticles formed initially on the surface of the Ag₃PO₄/Ag₂MoO₄ composites under visible-light illumination, leading to the generation of a Ag₃PO₄/Ag/Ag₂MoO₄ Z-scheme tandem photocatalytic system. The enhanced photocatalytic activity and stability were attributed to the formation of the Ag₃PO₄/Ag/Ag₂MoO₄ Z-scheme heterojunction and surface plasmon resonance of photo-reduced Ag nanoparticles on the surface. Finally, a plasmonic Z-scheme photocatalytic mechanism was proposed. This work may provide new insights into the design and preparation of advanced visible-light photocatalytic materials and facilitate their practical application in environmental issues.

Key words: Z-scheme heterojunction, Silver phosphate, Hybrid material, Charge transfer, Photocatalysis

Hua Tang, Yanhui Fu, Shufang Chang, Siyu Xie, Guogang Tang. Construction of Ag₃PO₄/Ag₂MoO₄ Z-scheme heterogeneous photocatalyst for the remediation of organic pollutants[J]. Chinese Journal of Catalysis, 2017, 38(2): 337-347.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(16)62570-6

https://www.cjcatal.com/EN/Y2017/V38/I2/337

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Construction of Ag₃PO₄/Ag₂MoO₄ Z-scheme heterogeneous photocatalyst for the remediation of organic pollutants

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