▎ 摘　　要

NOVELTY - An oxidized graphene quantum dot preparation method involves dispersing oxidized graphite into deionized water. The oxidized graphite is peeled-off and dispersed into a single layer for obtaining the single-layer oxidized graphene aqueous solution. The single-layer oxidized graphene aqueous solution, hydrogen peroxide aqueous solution and ferric ion solution are mixed at room temperature according to volume ratio of 5:20:0-0.5. The mixed solution is obtained and photo-catalytically oxidized for 15 minutes to 10 hours using an UV lamp to prepare the oxidized graphene quantum dot. USE - Method for preparing oxidized graphene quantum dot. ADVANTAGE - The method enables preparing the oxidized graphene quantum dot in a simple and convenient manner with even size. DETAILED DESCRIPTION - An oxidized graphene quantum dot preparation method involves dispersing oxidized graphite into deionized water for 1 hour under ultrasonic action with working frequency of 40 kHz and power of 160 W. The oxidized graphite is peeled off and dispersed into a single layer for obtaining the single-layer oxidized graphene aqueous solution. The single-layer oxidized graphene aqueous solution, hydrogen peroxide aqueous solution and ferric ion solution are mixed at room temperature according to volume ratio of 5:20:0-0.5. The mixed solution is obtained and photo-catalytically oxidized for 15 minutes to 10 hours using an UV lamp to prepare the oxidized graphene quantum dot. DESCRIPTION OF DRAWING(S) - The drawing shows a photograph of oxidized graphene quantum dot.