Combination of alpha-Fe2O3, CdS and reduced graphene oxide: high-performance and recyclable visible light photocatalysis

摘要

A magnetic heterogeneous alpha-Fe2O3/CdS-RGO (RGO: reduced graphene oxide) composite photocatalyst was synthesized using the one-step hydrothermal method. The alpha-Fe2O3 and CdS nanoparticles with a diameter range of 2060 nm were synchronously loaded/distributed on the surface of RGO. The as-synthesized alpha-Fe2O3/CdS-RGO nanocomposites were analyzed using X-ray diffraction, Fourier transform-infrared spectra, BET surface area, scanning electron microscopy, transmission electron microscopy, UV-Vis diffusive reflectance spectra and Raman spectroscopy. Compared with the pure CdS, alpha-Fe2O3 and alpha-Fe2O3/CdS nanoparticles, the alpha-Fe2O3/CdS-RGO nanocomposites expanded the adsorption range of visible-light, and showed significant photocatalytic performance and cyclic stability for degradation of methylene blue in visible light. Also, the remarkable catalytic performances mainly depend on its special structure of the alpha-Fe2O3/CdS-RGO, which enabled the effective separation of the electron-hole pairs. These attractive features make the alpha-Fe2O3/CdS-RGO nanocomposite to be a photocatalyst with great application potential in water pollutants treatment.