▎ 摘　　要

NOVELTY - Preparation of magnetic fluorescent graphene composite nano-ion probe involves using magnetic graphene and fluorescence quantum dot nanoparticles with different emission wavelength, by covalent bonding method. The fluorescent quantum dot nanoparticles are uniformly distributed on the surface of a magnetic graphene nano-sheet structure. The magnetic fluorescent graphene nanocomposite material has saturation magnetization of 20-70 emu/g and fluorescence emission peak of 370-600 nm. USE - Preparation of magnetic fluorescent graphene composite nano-ion probe used for detecting and separating copper ions. ADVANTAGE - The method enables preparation of magnetic fluorescent graphene composite nano-ion probe with excellent sensitivity and selectivity of copper ions. DETAILED DESCRIPTION - Preparation of magnetic fluorescent graphene composite nano-ion probe involves using magnetic graphene and fluorescence quantum dot nanoparticles with different emission wavelength, by covalent bonding method. The fluorescent quantum dot nanoparticles are uniformly distributed on the surface of a magnetic graphene nano-sheet structure. The magnetic fluorescent graphene nanocomposite material has saturation magnetization of 20-70 emu/g and fluorescence emission peak of 370-600 nm. The probe enables rapid detection and separation of copper ions by magnetic performance of quantum dot surface ligand molecule and light-emitting property of quantum dots.