▎ 摘　　要

NOVELTY - Preparing ferric oxide/graphene nano-composite material by sol electrostatic self-assembly method, comprises preparing ferric chloride solution, dropwise adding ferric chloride solution into boiling water, and boiling to obtain ferric hydroxide sol with a surface having positive charge; dispersing graphene oxide in water to obtain graphene oxide sol with a surface having negative charge; and mixing the graphene oxide sol and ferric hydroxide sol, magnetically stirring until brown precipitate appears, separating, discarding the supernatant to obtain ferric oxide and graphene oxide composite. USE - The nano-composite material is useful for: absorbing rhodamine B in wastewater; supercapacitor electrode material; and lithium-ion battery anode material (claimed). DETAILED DESCRIPTION - Preparing ferric oxide/graphene nano-composite material by sol electrostatic self-assembly method, comprises (i) at room temperature, preparing 15-30 mass% ferric chloride solution, under magnetic stirring dropwise adding ferric chloride solution into boiling water, where the weight ratio of ferric chloride solution droplet and water is 1:1-5, and boiling for 1-5 minutes to obtain ferric hydroxide sol with a surface having positive charge; (ii) ultrasonically dispersing graphene oxide in water to obtain graphene oxide sol with a surface having negative charge, where the volume ratio of graphene oxide and water is 1:10-20; and (iii) mixing the graphene oxide sol and ferric hydroxide sol in the weight ratio of 1:1-1:50, magnetically stirring until brown precipitate appears, separating, discarding the supernatant to obtain ferric oxide and graphene oxide composite, and heating at 300-800 degrees C under nitrogen atmosphere.