▎ 摘　　要

NOVELTY - Preparing (P1) a magnetic graphene oxide composite material, comprises forming a dispersion of graphene oxide and the magnetic material within a dispersant solution, and controlling the pH of the dispersant solution to cause the graphene oxide and magnetic material to have different surface charges, to form the magnetic graphene oxide composite material comprising a non-covalent complex of graphene oxide and a magnetic material. USE - The process is useful for preparing the magnetic graphene oxide composite material, which is useful for treating water (all claimed). ADVANTAGE - The process: utilizes cheap and readily processed materials; and provides a low energy alternative to non-magnetic graphene oxide separation processes including centrifugation and polymer flocculation. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) the magnetic graphene oxide composite material formed from the process (P1); (2) the magnetic graphene oxide composite material comprising the non-covalent complex of graphene oxide and magnetic material dispersed in the dispersant solution having a pH that is lower than the isoelectric point of the magnetic material and higher than the isoelectric point of graphene oxide; and (3) treating (P2) water using the magnetic graphene oxide composite material, comprising incorporating the magnetic graphene oxide composite material in a treatment solution including at least one capture material capable of being adsorbed by graphene oxide, allowing the magnetic graphene oxide composite material to adsorb the capture material or materials, and magnetically separating the magnetic graphene oxide composite material from the treatment solution.