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The adsorption behavior of lead(II) using a new magnetic adsorbent is investigated. The facile synthesis of MnFe2O4 was carried out using the co-precipitation method. The different parameters that affected the adsorption process were investigated such as contact time, metal ion concentration, pH, temperature, and the adsorbent dosage. The maximum lead(II) sorption capacity was found to be 75.75 (mg/g) and obtained using 1 g/L MnFe2O4 when pH equals 5.3, a temperature of 25 °C, and contact time as 60 min. The adsorption isotherm study indicated that the Langmuir model was the best model that described the adsorption process using 1 g/L MnFe2O4. Based on the values of correlation coefficient data (R2), the kinetic adsorption parameters were well defined by the second-order kinetic model. Furthermore, the temperature effect findings have been confirmed that the removal of lead ions was endothermic. The desorption efficiency reached more than 88% when used 0.01 M NaOH as an eluent.

Magnetically synthesized MnFe2O4 nanoparticles as an effective adsorbent for lead ions removal from an aqueous solution