▎ 摘　　要

NOVELTY - The preparation method of nano-( alpha )-ferric oxide-graphene composite material involves (1) dissolving iron salt precursor, urea and graphene oxide in 20 ml deionized water to form uniform aqueous solution, transferring the mixed solution to a 100 ml PTFE-lined container, adding 80 mL water, and ultrasonically dispersing at room temperature for 15-20 minutes, (2) placing the reactor in an oven, taking out, reacting at 180 degrees C for 8 hours, cooling to room temperature, (3) centrifuging the obtained product, repeatedly washing with deionized water and alcohol, drying the obtained ( alpha )-ferric oxide-reduced graphene oxide composite material in a vacuum drying box at 60 degrees C for 24 hours, storing, and maintaining the same experimental conditions without adding graphene oxide, and (4) setting the reaction temperature at 180-220 degrees C, controlling the temperature of different height to make the particle size different, and reacting for 8-10 hours. USE - Preparation method of nano-( alpha )-ferric oxide-graphene composite material for removing dye contaminants in water (claimed). ADVANTAGE - The method enables preparation of nano-( alpha )-ferric oxide-graphene composite material with excellent performance and high industrial output value in the adsorption of dye contaminants. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for use of composite material in treatment of pollutants, which involves when the obtained ( alpha )-phase iron oxide nanoparticles is cubic, the removal rate of malachite green gradually increases with the increase of the dosage of the material, and when the ( alpha )-ferric oxide nanoparticles are spherical and the dosage reaches a certain value, the removal rate of methyl orange is close to 100%.