▎ 摘　　要

NOVELTY - Method for preparing fluorescent graphene quantum dots, involves placing organic dye orange yellow (II) in hydrothermal reaction kettle, and performing hydrothermal reaction at 190-240 degrees C for 8-16 hours to obtain fluorescent graphene quantum dot. USE - Method for preparing fluorescent graphene quantum dots used for organic dye preparation, such as orange II (AO7), methylene blue (MB), reactive blue 19 (RB19) and methyl orange, and used as fluorescent probe for detecting metal ions. ADVANTAGE - The method directly generates graphene quantum dots with strong green fluorescence by hydrothermal method, and the prepared graphene quantum dot solution has significant effect as fluorescent probe for detecting metal ions, and quickly responds to metal ions iron3+ in water within 30 seconds. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a use of fluorescent graphene quantum dots prepared using above-mentioned method in selective detection of metal ions iron3+ in aqueous solution.