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Citric acid coated magnetite nanoparticles (Fe₃O₄-Cit) have been synthesized for the removal of cadmium from aqueous solutions. As-prepared Fe₃O₄-Cit was characterized by using Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and through the determination of pH_zpc. Several factors effecting the adsorption of Cd(II) ions on the surface of Fe₃O₄-Cit such as pH, temperature and contact time were investigated. The Cd(II) ions adsorption equilibrium on the Fe₃O₄-Cit were obtained by 35 min at the optimized pH 5. Kinetic study shows the Cd(II) adsorption onto Fe₃O₄-Cit follow the pseudo-second order kinetic model with R² > 0.997 at 308 K. The adsorption data was satisfactorily explained by Langmuir and Freundlich isotherm models. The experimental data found to be suitable linearity with Langmuir …