▎ 摘　　要

NOVELTY - Preparation of boron-doped graphene quantum dots, involves hydrothermally reacting a mixed solution of 1,3,6-trinitropyrene and borax, purifying by dialysis, and freeze-drying. USE - Preparation of boron-doped graphene quantum dots used for detecting iron ions (all claimed). ADVANTAGE - The method provides boron-doped graphene quantum dots which can emit yellow fluorescence, and has excellent fluorescent stability (fluorescence intensity remains 99% of the initial fluorescence intensity even when left for 3 months), peroxidase activity to catalyze hydrogen peroxide oxidation of 3,5,3',5'-tetramethylbenzidine color development reaction, and selective identification ability with respect to iron ions. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for boron-doped graphene quantum dots having a thickness of 1.2-1.8 nm and a grain size of 2-4 nm.