▎ 摘　　要

NOVELTY - Preparing graphene modified material comprises e.g. preparing graphene oxide-iron(II, III) oxide (Fe3O4) by adding graphene, iron salt and ferrous salt into the water, ultrasonic blending in the vacuum tubular furnace, raising the temperature, annealing, cooling to room temperature, filtering to obtain the intermediate, annealing the intermediate under the vacuum condition, preparing to obtain graphene oxide-Fe3O4, carrying out modification of graphene by reducing the graphene oxide-Fe3O4 material to obtain modified graphene, grafting modified graphene by adding the modified graphene and the weakly acidic polyacrylic acid resin into the ethanol solution, adjusting the pH of the solution, adding activating agent, stirring, adding acetone to precipitate, filtering, washing, freezing and drying to obtain modified graphene grafted with weakly acidic polyacrylic acid resin, where the activator is 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide. USE - The graphene modified material is useful in preparing medicine extracting and purifying material, rare earth element separation and purification materials and sewage heavy metal processing material (all claimed). DETAILED DESCRIPTION - Preparing graphene modified material comprises (1) preparing graphene oxide-iron(II, III) oxide (Fe3O4) by adding graphene, iron salt and ferrous salt into the water, ultrasonic blending in the vacuum tubular furnace under the argon atmosphere of 40-50 sccm, raising the temperature from room temperature to 650-750 degrees C at a heating rate of 5 degrees C/minutes, annealing for 6-8 hours, cooling to room temperature, filtering to obtain the intermediate, where the ratio of the total amount of the iron salt and ferrous salt to the mass of the graphite alkene is 1: 10-100; the amount ratio of the iron salt and ferrous salt is iron (III) ions (Fe3+) : iron (II) ions (Fe2+) is 1.75, (2) annealing the intermediate obtained in the step (1) under the vacuum condition, preparing to obtain graphene oxide-Fe3O4, (2) carrying out modification of graphene by reducing the graphene oxide-Fe3O4 material prepared in the step (1) to obtain modified graphene, (3) grafting modified graphene by adding the modified graphene prepared in the step (2) and the weakly acidic polyacrylic acid resin into the ethanol solution with the volume fraction of 40-65%, adjusting the pH of the solution to 4-5, adding activating agent, stirring for 24-48h at room temperature under the nitrogen atmosphere, adding acetone to precipitate, filtering, washing, freezing and drying to obtain modified graphene grafted with weakly acidic polyacrylic acid resin, where the mass ratio of the modified graphene and the weakly acidic polyacrylic acid resin is 10-20:1, the mass ratio of the total amount of the modified graphene and weak acid polyacrylic acid resin and the activator is 1.5-2:1, where the activator is 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysuccinimide with ratio is 1:2-4.