▎ 摘　　要

NOVELTY - Method for preparing blue fluorescent graphene quantum dots with reactive red 2 involves placing the organic dye reactive red 2 in a hydrothermal reaction kettle, where the hydrothermal reaction time is 8-16 hours at a temperature of 190-240 degrees C to prepare blue fluorescent graphene quantum dots. USE - Fluorescent graphene quantum dots used for detecting metal ion aluminum cation in aqueous solution (claimed). ADVANTAGE - The method generates graphene quantum dot with strong blue fluorescence and detects the metal ion aluminum cation in water in 30 seconds. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for use of blue fluorescent grapene quantum dots for detecting metal ion aluminum cation in aqueous solution.