▎ 摘　　要

NOVELTY - Preparing environment-friendly graphene quantum dot comprises adding mesoporous silica and a precursor into an ethanol solution under stirring and performing centrifugal separation to obtain mesoporous silica with the precursor adsorbed in a pore channel. The mesoporous silica is added with the precursor adsorbed in the pore channel prepared into absolute ethyl alcohol for carrying out ultraviolet radiation under condition of magnetic stirring to obtain the mesoporous silica with fragmented graphene in the pore channel. The mesoporous silica containing fragmented graphene is added hydrogen peroxide and absolute ethyl alcohol for carrying out ultraviolet radiation, and finally carrying out centrifugal separation to obtain the mesoporous silica containing graphene quantum dots in the pore canal. The mesoporous silica containing the graphene quantum dots in the pore channels is etched by hydrofluoric acid to obtain the graphene quantum dots. DDSC: --- USE - Method for preparing environment-friendly graphene quantum dot. ADVANTAGE - The method prepares the environment-friendly graphene quantum dot in a simple, cost-effective and eco-friendly manner with uniform size, good light and heat stability, high fluorescence intensity, strong photobleaching resistance, low toxicity and controllable emission wavelength, and is expected to replace inorganic quantum dots to be applied to the fields of biological analysis, biological imaging and the like.