▎ 摘　　要

The unique properties of graphene quantum dots (GQDs) i.e. low toxicity, excellent water solubility, low cost, high photostability, biocompatibility, and small size have attracted tremendous attention for new research prospects in the detection of metal ions. The fluorescence properties of GQDs are used for qualitative and quantitative analysis of U(VI) ion. The fluorescence of GQDs is intensively quenched by uranium. Synthesized GQDs were characterized by UV-visible spectroscopy, FTIR, Transmission electron microscopy, fluorescence spectrophotometry. Results indicate a single layer of GQDs, small size. Optimum pH is 7 for uranium detection and up to 1.5ppb of U(VI) ion is accurately determined.