Influence of Ag Doping on the Crystal Structure and Photocatalytic Activity of FeVO₄

Abstract:

Silver (Ag⁺) doped iron (III) vanadate (FeVO₄) samples are prepared by the precipitation method and then characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and X-ray photoelectron spectroscopy(XPS). The photocatalytic activity under visible light is evaluated by photocatalytic degradation of methyl orange (MO) in the solution. The results show that both FeVO₄ and Ag⁺ doped FeVO₄ samples are triclinic, the later have different surface morphology, and some needle-shaped materials appear in the later. From XPS, there are more Fe²⁺ ions in Ag⁺ doped FeVO₄ sample than that in FeVO₄ one without Ag⁺. It indicates that Ag⁺ doping can increase the density of the surface oxygen vacancies of catalysts, which can act as electron traps promoting the electron-hole separation and then increase the photo-activity. The decoloration rate after Ag⁺ doping against methyl orange solution can reach about 81%, and be more about 20％ than that of pure FeVO₄.

• Periodical: Advanced Materials Research (Volumes 197-198)
• Pages: 919-925
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.197-198.919
• Online since: February 2011
• Authors: Min Wang, Qiong Liu
• Keywords: Ag⁺ Doping, Iron (III) Vanadate (Fevo₄), Methyl Orange (MO), Photocatalyst

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