Synthesis of CaO/Fe3O4 magnetic composite for the removal of Pb(II) and Co(II) from synthetic wastewater

Farideh Shakerian Khoo, Hossein Esmaeili


In this study, CaO was prepared from chicken egg shells. Then, to improve its properties, CaO/Fe3O4 magnetic composite was synthesized and was used for the removal of lead (Pb (II)) and cobalt (Co (II)) ions from aqueous solutions. For this purpose, the effects of several parameters including pH, contact time, temperature, adsorption dosage and initial concentration of ions on the adsorption were studied. Optimum conditions of pH, contact time, temperature, adsorption dosage and initial concentration of Pb and Co ions were determined to be 6, 30 min, 25 °C, 2 g L-1 and 5 mg L-1, respectively. The best efficiency for adsorption of lead and cobalt ions was found to be 97.24 % and 94.32 %, respectively. To investigate the equilibrium behavior of adsorbent, Langmuir and Freundlich models were used. Also, pseudo-first order and pseudo-second order kinetic models were applied for consideration of kinetic behaviors of experimental data. Additionally, thermodynamic parameters including Enthalpy, Entropy and Gibbs free energy were calculated for the adsorption of these heavy metal ions. The results showed that Freundlich isotherm model and the pseudo-second order kinetic model achieved the best match with the experimental data and the maximum adsorption capacities obtained from the Langmuir model were 227.27 and 217.39 mg g-1 for lead and cobalt, respectively. Also, thermodynamics studies revealed that the adsorption process of lead and cobalt ions using CaO/Fe3O4 was suitable, spontaneous and exothermic.


adsorption; heavy metals; CaO/Fe3O4 composite; equilibrium and thermodynamics study.

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