▎ 摘　　要

NOVELTY - Graphene quantum dots are prepared by uniformly dispersing graphene oxide in 1st solvent to obtain 1st dispersion, adding reducing agent, uniformly dispersing to obtain mixture (S110), placing in microwave at 500-800 W for 10-60 minutes, cooling, subjecting to solid-liquid separation, collecting solid to obtain crude product (S120), mixing with reducing polyhydroxyaldehyde and organic acid, adding Lewis acid, uniformly mixing, adding 2nd solvent, uniformly dispersing to obtain 2nd dispersion (S130), placing in microwave, ultrasonically stripping, separating, and purifying (S140). USE - Preparation of graphene quantum dots (claimed). ADVANTAGE - The preparation of graphene quantum dots is simple, low cost, and has high yield and high utilization rate. DETAILED DESCRIPTION - Graphene quantum dots are prepared by uniformly dispersing graphene oxide in 1st solvent to obtain 1st dispersion, adding reducing agent, uniformly dispersing to obtain mixture, placing in microwave at 500-800 W for 10-60 minutes, cooling, subjecting to solid-liquid separation, collecting solid to obtain crude product, mixing with reducing polyhydroxyaldehyde and organic acid, adding Lewis acid, uniformly mixing, adding 2nd solvent, uniformly dispersing to obtain 2nd dispersion, placing in microwave at 500-800 W for 0.2-1 hour, ultrasonically stripping at 120-300 W for 2-3 hours, separating, and purifying. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart of preparation of graphene quantum dots. (Drawing includes non-English language text). Preparation of mixture (S110) Preparation of crude product (S120) Preparation of 2nd dispersion (S130) Preparation of graphene quantum dots (S140)