Amidoxime-functionalized magnetic graphene oxide-silica particles for adsorption of U(VI) ions from an aqueous medium

In this work, magnetic graphene oxide particles (MGO) were prepared and grafted with (3-glycidoxypropyl) triethoxysilane (Si). Then, the epoxy groups of MGO@Si were reacted with diamino maleonitrile (DAMN) via a ring-opening reaction. The nitrile groups of DAMN were reacted with hydroxyl amine to generate amidoxime groups on the materials. The zeta potential values of the MGO@Si-DADAO varied between 37.9 to −15.5 mV in the pH range of 2.0–11.0. The adsorption capacity of the MGO@Si-DADAO particles was found to be 641.4 mg/g. Additionally, after 10 adsorptions–desorption cycles, the adsorption capacity of MGO@Si-DADAO particles was not significantly altered.