▎ 摘　　要

NOVELTY - Preparing graphene quantum dots and visible light catalytic material comprises (1) inputting graphene and inert gas into first oscillation impact device in the environment of vacuum and low temperature cooling, subjecting the graphene to oscillation by first oscillation device, inputting the semi-finished graphene and inert gas in first oscillation impact device into second oscillation impact device with higher processing accuracy, obtaining spherical nano-sized graphene in second oscillation device, namely graphene quantum dots GQDs, (b) adding mixture of melamine and cyanuric acid to deionized water, transferring obtained solution to autoclave with oil bath, naturally cooling to room temperature, filtering and (c) taking supramolecular complex MCS and GQDs, filtering and drying, preparing obtained calcined MCS to obtain supramolecular graphitic carbon nitride, calcining melamine and obtaining visible light catalytic material SCN-GQDX containing graphene quantum dots GQDs. USE - The method is useful for preparing graphene quantum dots and visible light catalytic material. ADVANTAGE - The graphene quantum dots: is prepared in simple manner; has obvious response in ultraviolet region; has obvious advantage in visible light range. The catalytic material obtained by modifying graphene quantum dots has stronger light. DETAILED DESCRIPTION - Preparing graphene quantum dots and visible light catalytic material comprises (1) preparation of graphene quantum dots (GQDs): inputting certain amount of graphene and inert gas into first oscillation impact device in the environment of vacuum and low temperature cooling, subjecting the graphene to oscillation by first oscillation device, inputting the semifinished graphene and inert gas in first oscillation impact device into second oscillation impact device with higher processing accuracy to continue oscillation after the first preset time, obtaining spherical nano-sized graphene in second oscillation device after the second preset time, namely graphene quantum dots GQDs, (b) preparing precursor of visible light catalytic material: adding 2 g mixture of melamine and cyanuric acid in molar ratio of 1:1 to 60 ml deionized water, stirring at 60℃ for 2 hours, transferring obtained solution to 100 ml autoclave with 120℃ of oil bath for 2hours, naturally cooling to room temperature, filtering, washing with water and drying at 60℃to obtain supramolecular complex MCS and (c) preparing visible light catalytic material: taking 2g supramolecular complex MCS and certain amount of graphene quantum dot GQDs, adding 60ml deionized water, stirring at 60℃ for 2hours, filtering and drying at 60℃, preparing obtained calcined MCS to obtain supramolecular graphitic carbon nitride (sulfur-doped),calcining melamine at 550℃ for 2 hours to obtain bulk graphitic carbon nitride (bulk)and obtaining visible light catalytic material SCN-GQDX containing graphene quantum dots GQDs, where x in SCN-GQDX is constant greater than 0.