Post functionalization of manganese ferrite with chitosan for effective copper capture from aqueous systems

Cu(II) has garnered significant attention due to its adverse effects on the environment and human health. To address this issue, researchers developed a magnetic chitosan material (MnFe 2 O 4 -CS) as an adsorbent, exhibiting remarkable properties for effective Cu(II) capture and offering repeatability. MnFe 2 O 4 -CS features abundant nitrogen-containing functional groups that enhance its adsorption performance. Additionally, MnFe 2 O 4 -CS possesses excellent saturation magnetization, enabling easy removal from water. Experimental findings reveal that MnFe 2 O 4 -CS achieves an impressive Cu(II) removal rate of 99.8%. With an adsorption capacity of up to 103.6 mg/g. The fitting results demonstrated that the isothermal process followed the Redlich-Peterson model, indicating a complex adsorption behavior of Cu(II) by MnFe 2 O 4 -CS. The kinetic process followed a pseudo-second-order model, and the thermodynamic parameters prove that the present study is a heat-absorption reaction. The kinetics and thermodynamics prove that the adsorption of Cu(II) by MnFe 2 O 4 -CS is a chemisorption. MnFe 2 O 4 -CS maintains a high removal capacity for Cu(II) in aqueous solutions after six cycles. In summary, MnFe 2 O 4 -CS quickly and efficiently adsorbs Cu(II) ions, showing potential for practical application in heavy metals removal.