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In this study, two alternative synthesis routes for magnetic adsorbents were evaluated to remove Pb(II) and Cd(II) in an aqueous solution. First, activated carbon was prepared from argan shells ( C ). One portion was doped with magnetite ( Fe  3  O  4  +C ) and the other with cobalt ferrite ( CoFe  2  O  4  +C ). Characterization studies showed that C has a high surface area (1635 m 2 g -1 ) due to the development of microporosity. For Fe  3  O  4  +C the magnetic particles were nano-sized and penetrated the material's texture, saturating the micropores. In contrast, CoFe  2  O  4  +C conserves the mesoporosity developed because most of the cobalt ferrite particles adhered to the exposed surface of the material. The adsorption capacity for Pb(II) was 389 mg g -1 (1.88 mmol g -1 ) and 249 mg g -1 (1.20 mmol g -1 ); while for Cd(II) was 269 mg g -1 (2.39 mmol g -1 ) and 264 mg g -1 (2.35 mmol g -1 ) for the Fe  3  O  4  +C and CoFe  2  O  4  +C , respectively. The predominant adsorption mechanism is the interaction between -FeOH groups with the cations in the solution, which are the main reason these adsorption capacities remain high in repeated adsorption cycles after regeneration with HNO 3 . The results obtained are superior to studies previously reported in the literature, making these new materials a promising alternative for large-scale wastewater treatment processes using batch-type reactors.

Synthesis of Magnetic Adsorbents Based Carbon Highly Efficient and Stable for Use in the Removal of Pb(II) and Cd(II) in Aqueous Solution