Sorption of inorganic salts on carbon nanomaterials and magnetite

Abstract

Magnetic composites based on graphene oxides and functionalized carbon nanotubes containing magnetite nanoparticles are synthesized. The dispersing ability of these composites in water at different pH values is studied. It is shown that the solubility of Fe₃O₄ composites is constant in the рН range of 3.5–10, though these composites are unstable at both lower and higher pH values. Magnetic sorbents for extracting Се(NO₃)₃ and La(NO₃)₃ from solutions are tested. Dependences of the volume on the sorbent’s composition, pH value, and salt concentration in the solution are found. Maximum sorption capacity in relation to Се³⁺ and La³⁺ at рН 7.5 and 8.5 are found to be 1040 and 920 mg/g respectively.