▎ 摘　　要

NOVELTY - Reagent having high selectivity comprises a solution of graphene quantum dots with alizarin red on the surface, which is prepared by two-step hydrothermal method (i) placing graphene oxide solution in a container, adding aqueous ammonia and deionized water, transferring it to polytetrafluoroethylene-lined hydrothermal kettle, heating, cooling, filtering, heating the resulting yellow solution to evaporate excess ammonia and dialyzing to obtain aminated graphene quantum dots, and (ii) adding the aminated quantum dots in the container, adding a certain amount of alizarin red aqueous solution under uniform stirring, transferring the solution to polytetrafluoroethylene-lined hydrothermal kettle, heating and reacting, cooling to room temperature, filtering the obtained solution with a filter membrane, and dialyzing to obtain surface-modified with alizarin red graphene quantum dots. USE - The reagent is useful for rapid detection of zinc ions (claimed). ADVANTAGE - The reagent having nano quantum dots has multi-electronic characteristics, excellent water dispersibility, excellent biocompatibility, strong luminescence and high quantum efficiency. The graphene quantum dot has high selectivity and sensitivity to zinc ions; the synthesis method is simple, has mild reaction conditions, and the product is easy to obtain. The zinc ions can be quickly detected in a normal temperature aqueous solution environment, and the method has simple process and convenient operation. DETAILED DESCRIPTION - Reagent having high selectivity comprises a solution of graphene quantum dots with alizarin red on the surface, and the graphene quantum dots with alizarin red on the surface are prepared by a two-step hydrothermal method (i) placing graphene oxide solution in a container, adding 3-15 ml of 28% aqueous ammonia and 5 ml deionized water under uniform stirring, stirring and transferring it to polytetrafluoroethylene-lined hydrothermal kettle, heating at 130-200 ℃ for 6-20 hours, cooling to room temperature, filtering the resulting solution with a membrane filter, heating the resulting yellow solution at 100 ℃ to evaporate excess ammonia, and dialyzing for 3 days with dialysis bag with molecular weight of 500 Da to obtain aminated graphene quantum dots, and (ii) adding the aminated quantum dots in the container, adding a certain amount of alizarin red aqueous solution under uniform stirring, transferring the solution to polytetrafluoroethylene-lined hydrothermal kettle, heating and reacting, cooling to room temperature, filtering the obtained solution with a filter membrane, and dialyzing for three days with dialysis bag with a molecular weight of 500 Da to obtain surface-modified with alizarin red graphene quantum dots. An INDEPENDENT CLAIM is also included for rapid detection of zinc ions, comprising adding the substance to be tested to the reagent having with high selectivity and rapid detection of zinc ions, and testing the fluorescence spectrum of the test solution at EM490 nm using fluorescence photometry.