▎ 摘　　要

NOVELTY - Preparing methoxy group-containing graphene quantum dots comprises (i) taking graphite powder, sulfuric acid and nitric acid, reacting under stirring condition for 0.1-48 hours, after carrying out reaction in two stages, adding ultra-pure water to terminate the reaction, centrifugally separating, and drying to obtain pre-oxidized graphite, (ii) preparing graphite oxide, and (iii) ultrasonically dissolving the graphite oxide in methanol, pouring in a hydrothermal kettle at 90-400 degrees C for carrying out hydro-thermal reaction, allowing to stand, separating, and finally removing methanol. USE - The graphene quantum dot is useful in fluorescent powder field. ADVANTAGE - The graphene quantum dot: can be stored in methanol for long-period; and has chemical stability. DETAILED DESCRIPTION - Preparing methoxy group-containing graphene quantum dots comprises (i) taking graphite powder, sulfuric acid and nitric acid, reacting at 0-200 degrees C under stirring condition for 0.1-48 hours, after carrying out reaction in two stages, adding ultra-pure water to terminate the reaction, centrifugally separating, and drying to obtain pre-oxidized graphite, where the mol ratio of the graphite powder and sulfuric acid is 1:100-100:1, and the mol ratio of the graphite powder and nitric acid is 1:100-100:1, (ii) mixing the pre-oxidized graphite, sulfuric acid and potassium permanganate, reacting at room temperature for 1-100 hours, after carrying out reaction in two stages, adding ultra-pure water to terminate the reaction, centrifugally separating, ultrasonically dispersing, vacuum freezing, and drying to obtain graphite oxide, where the mol ratio of the pre-oxidized graphite and potassium permanganate is 1:100-100:1, and the mol ratio of the sulfuric acid and pre-oxidized graphite is 1:100-100:1, and (iii) ultrasonically dissolving the graphite oxide in methanol, pouring in a hydrothermal kettle at 90-400 degrees C for carrying out hydro-thermal reaction for 30-48 hours, allowing to stand, separating, and finally removing methanol to obtain the methoxy group-containing graphene quantum dot, where the mol ratio of graphene oxide and methanol is 0.01:1-1:100.