فهرست نشریات علمی دسترسی آزاد ایران

This study presents the synthesis, characterization, and application of Ni₀.₅Zn₀.₅Fe₂O₄ magnetic nanoparticles for the removal of heavy metal ions Pb(II), Cd(II), and Cu(II) from aqueous solutions. The nanoparticles were synthesized via a chemical co-precipitation method and characterized using FT-IR, XRD, SEM, and EDS techniques, confirming their crystalline structure, morphology, and elemental composition. The average crystallite size was found to be 10.4 nm, while SEM analysis showed an average particle size of 31.0 nm. The adsorption performance was evaluated under varying conditions of pH, adsorbent dosage, and contact time. Optimal removal was achieved at pH 5.0 for Pb²⁺ and pH 5.5 for Cd²⁺ and Cu²⁺, with respective contact times of 10, 35, and 40 minutes. Adsorption isotherm studies indicated that Pb²⁺ followed the Freundlich model, while Cd²⁺ and Cu²⁺ fit the Sips model, with maximum adsorption capacities of 77.25, 49.32, and 15.71 mg g-1, respectively. Kinetic data were best described by the pseudo-second-order model, suggesting chemisorption as the dominant mechanism. Desorption experiments demonstrated efficient recovery of adsorbed ions using dilute HNO₃ and acetic acid, and the nanoparticles retained high removal efficiency over multiple reuse cycles. Compared to other adsorbents, Ni₀.₅Zn₀.₅Fe₂O₄ nanoparticles exhibited superior performance, highlighting their potential as a cost-effective and reusable adsorbent for environmental remediation of heavy metal contaminants.