Novel visible-light-driven Fe2O3/Ag3VO4 composite with enhanced photocatalytic activity toward organic pollutants degradation

Abstract

In this study, a new type of high-performance visible light photocatalyst Fe₂O₃/Ag₃VO₄ was prepared by a two-step method. Fe₂O₃ was prepared by a solvothermal method first and then the Fe₂O₃/Ag₃VO₄ photocatalyst was synthesized with different mass ratios by a simple chemical precipitation method. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray energy dispersive spectrometry (EDS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), UV-vis absorption spectroscopy (in DRS mode), and electrochemical impedance spectroscopy (EIS) were applied to characterize the as-prepared samples. The results showed that the as-prepared photocatalyst was uniform in the shape of particles. Photocatalytic properties of the as-prepared samples were evaluated by degrading RhB under visible light. The results showed that 1% Fe₂O₃/Ag₃VO₄ composite presented the highest photocatalytic activity. After 60 min, 96.1% of RhB was degraded by 1% Fe₂O₃/Ag₃VO₄ composite. Finally, trapping experiments confirmed that the hole (h⁺) and superoxide free radical (˙O₂⁻) were the main active species in degrading RhB.