▎ 摘　　要

NOVELTY - Preparing graphene quantum dots involves taking citric acid as a raw material, dispersing citric acid with mass of 0-26.388g ionic liquid at room temperature to get dispersion liquid, adding 10-30ml deionized water into the dispersion liquid and performing ultrasonic dispersion for 10-30 minute, and transferring the dispersion liquid into a reaction kettle. The reaction kettle is placed in an oven, and the oven temperature is controlled to react for 3-24 hours at 100-180 degrees C to get mixed solution. The mixed solution poured out after the reaction, then centrifuged at 10000-20000 revolutions/minute (rpm), transferred into a dialysis bag, and dialyzed for 3-10 days to obtain graphene quantum dots. USE - Method for preparing graphene quantum dots. ADVANTAGE - The method is simple to operate and easy to popularize and apply on a large scale, and the prepared graphene quantum dots are uniform in size, has good water solubility and stable fluorescence property.