▎ 摘　　要

Fe3O4 quantum dots (QDs)-graphene (GN) nanocomposites were successfully synthesized via a simple one-step hydrothermal method. The results showed that Fe3O4 QDs were well dispersed on the surface of graphene nanosheets, forming Fe3O4-GN nanocomposites. All of the samples exhibited superparamagnetic properties, the magnetic saturation value of the Fe3O4-GN nanocomposites was decreased as the initial mass ratio of the Fe3O4 QDs and GN decreased from 5:1 to 1:5. The Fe3O4-GN nanocomposites (Fe3O4: GN = 1:5) exhibited excellent adsorption ability in the removal of MB dyes, and all samples could achieve completely adsorption of MB within 12 min, suggesting their use as a promising adsorbent for water treatment.