▎ 摘　　要

NOVELTY - A graphene with deposited nanoferric oxide is prepared by oxidizing natural crystalline flake graphite to obtain graphite oxide; further peeling graphite oxide by ultrasound to obtain graphene oxide suspension; reducing the graphene oxide suspension in the presence of strong reductant, filtering by microporous filter film after finishing the reaction, and washing to obtain neutral graphene; and preparing graphene into suspension and depositing ferric oxide on its surface by in-situ chemical deposition method to obtain surface-modified graphene. USE - Method for preparation of graphene with deposited nanoferric oxide on surface (claimed). ADVANTAGE - The method provides surface-modified graphene that can be well dispersed in high-performance resin matrix to improve mechanical property, thermal property, electromagnetic property and frictional property of the resin matrix for upgrading phenolic resin, bismaleimide and cyanate ester product. DETAILED DESCRIPTION - Preparation of graphene with deposited nanoferric oxide on surface comprises: (A) weighing graphite and nitrate at a mass ratio of 1:1-100:1, adding concentrated sulfuric acid into flask, agitating at an ice bath temperature and slowly adding the mixture of graphite and the nitrate, adding strong oxidant at lower than 10 degrees C, controlling the adding time of the strong oxidant at 0.5-5 hours, keeping the temperature to continue to react for 1-24 hours, heating up to 20-60oC to react for 0.5-5 hours, continuing to slowly heat up to 80-100 degrees C, slowly adding water during the heating period, keeping reaction for 0.5-5 hours and observing color change, diluting the system with warm water, controlling the adding amount of the warm water to be 1-20 times of the volume of the concentrated sulfuric acid, and performing suction filtration and drying to obtain graphite oxide; (B) mixing the graphite oxide with water to peel by ultrasound to obtain suspension (0.1-2 mg/ml), heating and refluxing in oil bath at 80-100 degrees C, agitating and adding the reductant, reacting for 1-24 hours, washing and performing suction filtration to obtain neutral graphene, and drying; and (C) weighing graphene and ferrous sulfate heptahydrate crystals at a mass ratio of 1:1-1:100, dissolving the crystals into water to prepare solution (0.001-0.1 mol/L), adding graphene powder into the solution, dispersing by ultrasound to obtain graphene suspension, heating and refluxing in oil bath at 80-100 degrees C to obtain graphene suspension, keeping the suspension in a nitrogen atmosphere, adding 0.1-1 mol/L alkaline solution when the suspension is at 80 degrees C, controlling pH of the reaction solution at 8-14, adding hydrogen peroxide, stopping reacting 1-20 hours later, performing suction filtration, and drying to obtain product.