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Received November 7, 2013
Accepted February 10, 2014
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Biosorption potential of the mediterranean plant (Posidonia oceanica) for the removal of Cu2+ ions from aqueous media: Equilibrium, kinetic, thermodynamic and mechanism analysis
1Laboratory of Heterocyclic Chemistry, Natural Products and Reactivity, Faculty of Sciences of Monastir, Monastir, Tunisia 2Department of Colloid Chemistry, Belgorod State Technological University, 308012 Belgorod, Russia, Tunisia
Korean Journal of Chemical Engineering, July 2014, 31(7), 1211-1218(8), 10.1007/s11814-014-0054-y
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Abstract
The biosorption characteristics of copper(II) ions using Posidonia oceanica biomass were investigated. Experimental parameters affecting the biosorption process such as pH level, contact time, biosorbent dosage and temperature were studied. The equilibrium data were applied to the Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models. The Langmuir model fitted very well the equilibrium data, and the maximum uptake of Cu(II) by Posidonia oceanica was found to be 76.92 mg/g. The mean free energy E (10.78 kJ/mol) from the D-R isotherm indicated a chemical ion-exchange mechanism. Kinetic results showed that the pseudo-second-order kinetic model was well fitted to the experimental data. Thermodynamic parameters depicted the exothermic nature of biosorption and the process was feasible and spontaneous. The results of FTIR (Fourier-transform infrared spectroscopy) revealed that carboxyl, amine, and hydroxyl groups on the biomass surface were involved in the biosorption of Cu(II) ions.
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