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a b s t r ac tMnFe 2 O 4 /bentonite nanocomposite was synthesized by chemical co-precipitation method. The prepared nanocomposite was characterized by X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and scanning electron microscopy (SEM) techniques. The XRD results indicated the montmorillonite associated with quartz phases in the structure of MnFe 2 O 4 /bentonite nanocomposite synthesized. VSM was carried out to characterize the magnetic properties of the nanocomposite prepared. SEM images of the nanoadsorbent showed that nanocomposite has a uniform structure in the range of 50-200 nm in diameter. Adsorption characteristic of the synthesized nanocomposite was examined to evaluate adsorption of the cobalt(II) ion from aqueous sample solutions and at pH range of 4.5-5.0 the maximum amount of cobalt(II) ion was adsorbed. The maximum adsorption capacity of cobalt(II) was determined to be 22.42 mg g −1 . The results showed that nanocomposite has catalytic activity higher than the bentonite itself. The results obtained from the adsorption kinetic studies showed that adsorption behavior of cobalt(II) ion onto nanoadsorbent conformed to Langmuir isotherm model and pseudo-second-order kinetic.