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Magnetite nanoparticles (Fe3O4) and humic acid coated magnetite nanoparticles (Fe3O4/HA) were prepared by co-precipitation method for cerium ions removal from aqueous solution. The success of preparation in nanoscale was confirmed by XRD and TEM. The TEM image shows that the size of Fe3O4 is around 15 nm and the presence of humic acid reduces the magnetite aggregation and stabilizes the magnetite suspension. Adsorption studies with respect to various process variables Downloaded by [New York University] at 23:16 17 June 2016 2 such as contact time, pH and temperature were investigated by batch technique. The sorption kinetics and isotherms of Fe3O4 and Fe3O4/HA for Ce (IV) ions show that the sorption kinetics follow the pseudo-second-order and Langmuir isotherm model for both sorbents. The maximum capacity (Qmax) of Ce (IV) onto Fe3O4 and Fe3O4/HA were found to be 160, 280 mg/g, respectively. The thermodynamic parameters (∆G o , ∆H o and ∆S o ) were calculated, and the results revealed that the sorption process of Ce (IV) ions on both Fe3O4 and Fe3O4 /HA are spontaneous, endothermic for Fe3O4 and exothermic for Fe3O4/HA.