▎ 摘　　要

NOVELTY - Preparing graphene quantum dot based on heterogeneous catalyst, comprises (i) dispersing manganese dioxide particles in water and stirring vigorously, (ii) maintaining stirring, boiling the dispersion obtained in step (i), stopping heating and adding hydrogen peroxide, (iii) immediately adding neutral graphene oxide solution into reaction solution obtained in step (ii), continuously stirring, maintaining boiling slightly, and adding hydrogen peroxide properly, (iv) stopping heating, continuously stirring, adding hydrochloric acid and hydrogen peroxide to convert all manganese dioxide into manganese(II) ions, and (v) filtering the reaction solution obtained in step (iv), and dialyzing the obtained liquid to obtain final product. USE - The method is useful for preparing graphene quantum dot based on heterogeneous catalyst. ADVANTAGE - The method has simple device, easy to process the product, does not require ultraviolet light irradiation, and does not introduce impurities.