▎ 摘　　要

NOVELTY - Preparing modified graphene involves dispersing graphene oxide in deionized water, and agitating the solution at room temperature for 0.5-16 hours under ultrasonic pressure to obtain an aqueous solution of an oxidized graphene/water dispersion having concentration of 0.01-3.0 mg/ml. The modifying agent sodium fluorescein is added to the oxidized graphene/water dispersion and the mixture is stirred at 20-60 degrees C for 0.1-10 hours. The alkali solution is added to the obtained mixture and the mixture is stirred for 0.1-10 hours and after that pH value of the system is adjusted 9-10. USE - Method for preparing modified graphene (claimed). ADVANTAGE - The method enables to prepare modified graphene in simple and easily controllable manner under mild reaction conditions and the product has improved dispersibility in water and organic solvent. DETAILED DESCRIPTION - Preparing modified graphene involves dispersing graphene oxide in deionized water, and agitating the solution at room temperature for 0.5-16 hours under ultrasonic pressure to obtain an aqueous solution of an oxidized graphene/water dispersion having concentration of 0.01-3.0 mg/ml. The modifying agent sodium fluorescein is added to the oxidized graphene/water dispersion and the mixture is stirred at 20-60 degrees C for 0.1-10 hours. The alkali solution is added to the obtained mixture and the mixture is stirred for 0.1-10 hours and after that pH value of the system is adjusted 9-10. The reaction system is then added with chemical reducing agent and the reaction mixture is allowed to react for 10-100 hours at 60-95 degrees C and the reaction mixture is cooled to room temperature. The obtained mixture is filtered, centrifuged and washed with ethanol and deionized water to neutralize the product. The obtained product is then dried to constant weight in the atmosphere or vacuum environment at 40-80 degrees C to obtain the modified graphene. The weight ratio of the oxidized graphene, sodium fluorescein and chemical reducing agent is 1:1-30:1-50.