▎ 摘　　要

NOVELTY - Large-scale preparation graphene quantum dots, comprises adding graphene oxide into a first solvent to obtain a first dispersion solution; adding a reducing agent into the first dispersion solution to obtain a mixed solution; reacting, carrying out solid-liquid separation after cooling and taking the solids to obtain a crude product; mixing reductive polyhydroxy aldehyde and organic acid with the crude product; adding a Lewis acid and mixing to obtain a mixture; adding the mixture to a second solvent to obtain a second dispersion solution; reacting, stripping, and separating and purifying. USE - The method is useful for large-scale preparation graphene quantum dots (claimed). ADVANTAGE - The large-scale preparation is completed by a microwave-solvothermal method, has simple process, achieves high utilization rate of graphene oxide, and produces high yield of graphene quantum dots. DETAILED DESCRIPTION - Large-scale preparation graphene quantum dots, comprises adding graphene oxide into a first solvent to obtain a first dispersion solution; adding a reducing agent into the first dispersion solution to obtain a mixed solution; reacting the mixed solution in a microwave environment at 500-800 watts for 10-60 minutes, carrying out solid-liquid separation after cooling and taking the solids to obtain a crude product; mixing one of a reductive polyhydroxy aldehyde and an organic acid with the crude product; adding a Lewis acid and uniformly mixing to obtain a mixture; adding the mixture to a second solvent to obtain a second dispersion solution; reacting the second dispersion solution in the microwave environment at 500-800 watts for 0.2-1 hour, then stripping in an ultrasound environment at 120-300 watts for 2-3 hours, and separating and purifying to obtain the graphene quantum dots.