The biosorption characteristics of lanthanum and cerium ions from aqueous solution by grapefruit peel have been investigated as a function of pH, biosorbent dosage, contact time, and temperature. The pH was found to be significantly affecting the biosorption performance: pH 5.0 was found to be an optimum pH for favorable biosorption of lanthanum and cerium ions. The experimental isotherm data were analyzed using Langmuir and Freundlich equations. The Langmuir model fits the equilibrium data better than the Freundlich model. According to the Langmuir equation, the maximum uptake for La(III) and Ce(III) ions were 171.20 and 159.30 mg/g, respectively. Pseudo-first-order and pseudo-second-order models were used to represent the kinetics of the process. The results show that the pseudo-second-order model is the one that best describes the kinetics of the biosorption of both metal ions. The calculated thermodynamic parameters (ΔG°, ΔH°, and ΔS°) show that the biosorption process is feasible, spontaneous, and endothermic at 20–50 °C. FTIR analysis demonstrates that carboxyl and hydroxyl groups are involved in the biosorption of the metal ions. This study shows that grapefruit peel has the potential of application as an efficient biosorbent for the removal of lanthanide elements from aqueous solutions.
Research on Chemical Intermediates – Springer Journals
Published: Apr 30, 2013
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