▎ 摘　　要

NOVELTY - Supercritical continuous hydrothermal synthesis of graphene quantum dot comprises placing deionized water into a heater, heating, dispersing oxidized graphene uniformly in deionized water, mixing with p-sulfonic acid calixarene, stirring, passing of aqueous solution and alkali solution into T-type mixed tube to obtain mixture, passing mixed solution and supercritical water while the convection side into a convection reactor, making into slurry, passing into vertical cooler, cooling, filtering, dialyzing and drying to obtain a dark brown solid powder. USE - The method is useful for supercritical continuous hydrothermal synthesis of graphene quantum dot (claimed). ADVANTAGE - The method is simple, economical, environmentally friendly, produces even sized graphene quantum dots and has no toxic side effect. DETAILED DESCRIPTION - Supercritical continuous hydrothermal synthesis of graphene quantum dot comprises: (1) placing deionized water into a heater, heating at 24 MPa at 450 degrees C; (2) dispersing oxidized graphene uniformly in deionized water, mixing with p-sulfonic acid calixarene, stirring evenly, passing of aqueous solution and alkali solution at the same time into T-type mixed tube to obtain mixture; (3) passing of step (2) mixed solution and step (1) supercritical water while the convection side into a convection reactor, making into slurry, passing into vertical cooler, cooling with deionized water; (4) applying back pressure valve, passing into membrane filter device, filtering; (5) dialyzing the filtrate for 12 hours, drying to obtain a dark brown solid powder i.e. graphene quantum dot.