▎ 摘　　要

NOVELTY - The method for preparing magnetic graphene oxide-chitosan composite material involves (a) directly synthesizing magnetic nanoparticles in graphene oxide dispersion liquid under the condition of nitrogen protection and loading magnetic nanoparticles on a surface of graphene oxide to obtain magnetic graphene oxide material, and (b) chemically crosslinking magnetic graphene oxide material and chitosan to obtain magnetic graphene oxide-chitosan composite material. USE - Method is useful for preparing magnetic graphene oxide-chitosan composite material, which is useful as an adsorbent to remove cobalt in wastewater (all claimed). ADVANTAGE - The composite material has large specific surface area, high adsorption capacity and saturation magnetic field strength and rapid adsorption equilibrium time, and enables easy and rapid absorption of cobalt in wastewater. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) the magnetic graphene oxide-chitosan composite material prepared by the above method; and (2) use of the magnetic graphene oxide-chitosan composite material as an adsorbent to remove cobalt in wastewater.