▎ 摘　　要

NOVELTY - Preparing modified graphene-chitosan composite film, comprises (i) preparing modified graphite alkene; (ii) preparing modified graphite alkene dispersion liquid; and (iii) preparing thin film by dissolving chitosan in acetic acid, to obtain 0.5-10% chitosan-acetic acid solution, adding step (ii) product to chitosan-acetic acid solution, stirring for 0.1-12 hours, subjecting to ultrasound for 0.5-24 hours, and dispersing uniformly to obtain modified graphene-chitosan mixed solution, pouring graphene-chitosan mixed solution under atmosphere or vacuum environment conditions, and drying. USE - The method is useful for preparing modified graphene-chitosan composite film (claimed). ADVANTAGE - The method has simple preparation procedure, mild reaction condition, and easy controllable operation conditions. DETAILED DESCRIPTION - Preparing modified graphene-chitosan composite film, comprises (i) preparing modified graphite alkene by dispersing graphene oxide in deionized water, subjecting to ultrasonic oscillation stirring at high temperature of 0.5-12 hours, to obtain 0.01-2 mg/ml aqueous graphene oxide dispersion liquid, adding 7-hydroxy-4-methylcoumarin into dispersion liquid and water, stirring for 0.1-10 hours at 20-60 degrees C, adding alkaline solution, stirring for 0.1-10 hours, regulating pH to 9-10, adding chemical reduction agent, reacting at 60-100 degrees C for 12-96 hours, to obtain modified mixed liquid, carrying out suction filtration of modified modified mixed liquid to obtain solid material, washing the solid material with ethanol and deionized water to neutral, placing under atmosphere or vacuum environment conditions, drying to constant weight at 40-80 degrees C; (ii) preparing modified graphite alkene dispersion liquid by adding step (i) product with modified graphene as solute to solvent, stirring for 0.5-10 hours, subjecting to ultrasound for 0.5-12 hours, concentrating to 0.01-2 mg/ml modified graphene and graphene dispersion liquid; and (iii) preparing thin film by dissolving chitosan in acetic acid at 20-50 degrees C, to obtain 0.5-10% chitosan-acetic acid solution, adding step (ii) product into chitosan-acetic acid solution, stirring for 0.1-12 hours, subjecting to ultrasound for 0.5-24 hours, and dispersing uniformly to obtain modified graphene-chitosan mixed solution, pouring graphene-chitosan mixed solution under atmosphere or vacuum environment conditions, and drying to constant weight at 40-80 degrees C, to obtain the final product, where the mass fraction of modified graphite alkene is 0.1-15%.