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In the present work, a novel magnetic chitosan/graphene oxide nanocomposite (MCGON) was synthesized for the removal of Cu²⁺ from aqueous solutions. The adsorbent was composed of graphene oxide (GO) modified by ethylenediamine (ED), Fe₃O₄ nanoparticles and chitosan-g-poly(acrylic acid-co-2-acrylamido-2-methylpropane sulfonic acid) copolymer. The composition and structure of adsorbents were characterized by FTIR, SEM, EDX, XRD, TGA, VSM and BET analysis. The magnetic MCGON with a high specific surface area of (132.9 m² g⁻¹), large pore volume (4.03 cm³ g⁻¹), small particle size (15 nm) and strong saturation magnetization (3.82 emu g⁻¹) was used as an efficient adsorbent for the removal of Cu²⁺ ions from wastewater. The results showed that the adsorption of Cu²⁺ onto MCGON exhibited a maximum adsorption capacity of 217.4 mg g⁻¹.

Kinetics, thermodynamics and equilibrium …