▎ 摘　　要

The facile one-pot synthetic route to prepare a 3D graphene composition of hematite (alpha-Fe2O3)-reduced graphene oxide (rGO) hybrid materials has been reported. The alpha-Fe2O3-rGO materials exhibit excellent capacity to remove malachite green (MG) from water. The pristine suspension of graphene oxide (GO) from the Hummers method mixed with FeCl3 and urea in the solution, is in situ transformed into alpha-Fe2O3-rGO composites under hydrothermal conditions. The morphology and structure of the alpha-Fe2O3-rGO composites are characterized using transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoemission spectroscopy, Fourier transform-infrared spectroscopy, etc. It is found that alpha-Fe2O3 nanoparticles with cubic shapes and particles with the cubic side of 10-30 nm are uniformly distributed on the graphene layer. The application of alpha-Fe2O3-rGO materials for the removal of MG from the aqueous solutions is investigated. The Langmuir model is found to fit well with the experimental isotherm data, with a maximum adsorption capacity of 438.8 mg g(-1) for MG dye. The MG adsorption process is controlled by the pseudo-second-order rate model. The excellent capacity of alpha-Fe2O3-rGO to remove MG from water is ascribed to the synergetic adsorptive effect between alpha-Fe2O3 and rGO. The research provides an attractive adsorbent for removing the hazardous materials from wastewater.