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 (Fe3O4+C) and the other with cobalt ferrite (CoFe2O4+C). Characterization studies showed that C has a high surface area (1635 m2 g-1) due to the development of microporosity. For Fe3O4+C the magnetic particles were nano-sized and penetrated the material's texture, saturating the micropores. In contrast, CoFe2O4+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 Fe3O4+C and CoFe2O4+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 HNO3. 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.

Carbon Materials Research Group Department of Inorganic Chemistry Faculty of Sciences University of Granada Av Fuente Nueva s n 18071 Granada Spain

Department of Chemistry Faculty of Science University of Ostrava 30 dubna 22 702 00 Ostrava Czech Republic

Fabrication Technology Research Department Advanced Technology and New Materials Research Institute Alexandria 21934 Egypt

Grupo de Investigación en Materiales y Fenómenos de Superficie Departamento de Ciencias Biotecnológicas y Ambientales Universidad Autónoma de Guadalajara Av Patria 1201 Zapopan 45129 Mexico

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