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Adsorption of Pb(II) ions from aqueous solution by native and activated bentonite: kinetic, equilibrium and thermodynamic study.
J Hazard Mater. 2010 Jul 15; 179(1-3):332-9.JH

Abstract

In this study, the adsorption kinetics, equilibrium and thermodynamics of Pb(II) ions on native (NB) and acid activated (AAB) bentonites were examined. The specific surface areas, pore size and pore-size distributions of the samples were fully characterized. The adsorption efficiency of Pb(II) onto the NB and AAB was increased with increasing temperature. The kinetics of adsorption of Pb(II) ions was discussed using three kinetic models, the pseudo-first-order, the pseudo-second-order and the intra-particle diffusion model. The experimental data fitted very well the pseudo-second-order kinetic model. The initial sorption rate and the activation energy were also calculated. The activation energy of the sorption was calculated as 16.51 and 13.66 kJ mol(-1) for NB and AAB, respectively. Experimental results were also analysed by the Langmuir, Freundlich and Dubinin-Redushkevich (D-R) isotherm equations at different temperatures. R(L) separation factor for Langmuir and the n value for Freundlich isotherm show that Pb(II) ions are favorably adsorbed by NB and AAB. Thermodynamic quantities such as Gibbs free energy (DeltaG), the enthalpy (DeltaH) and the entropy change of sorption (DeltaS) were determined as about -5.06, 10.29 and 0.017 kJ mol(-1) K(-1), respectively for AAB. It was shown that the sorption processes were an endothermic reactions, controlled by physical mechanisms and spontaneously.

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Authors+Show Affiliations

Kul AR
Yuzuncu Yil University, Faculty of Art and Science, Department of Chemistry, 65080 Van, Turkey.
Koyuncu H
No affiliation info available

MeSH

AdsorptionAlgorithmsBentoniteDiffusionKineticsLeadModels, StatisticalNitrogenPorositySolutionsThermodynamicsWaterX-Ray Diffraction

Pub Type(s)

Journal Article

Language

eng

PubMed ID

20356674

Citation

Kul, Ali Riza, and Hülya Koyuncu. "Adsorption of Pb(II) Ions From Aqueous Solution By Native and Activated Bentonite: Kinetic, Equilibrium and Thermodynamic Study." Journal of Hazardous Materials, vol. 179, no. 1-3, 2010, pp. 332-9.
Kul AR, Koyuncu H. Adsorption of Pb(II) ions from aqueous solution by native and activated bentonite: kinetic, equilibrium and thermodynamic study. J Hazard Mater. 2010;179(1-3):332-9.
Kul, A. R., & Koyuncu, H. (2010). Adsorption of Pb(II) ions from aqueous solution by native and activated bentonite: kinetic, equilibrium and thermodynamic study. Journal of Hazardous Materials, 179(1-3), 332-9. https://doi.org/10.1016/j.jhazmat.2010.03.009
Kul AR, Koyuncu H. Adsorption of Pb(II) Ions From Aqueous Solution By Native and Activated Bentonite: Kinetic, Equilibrium and Thermodynamic Study. J Hazard Mater. 2010 Jul 15;179(1-3):332-9. PubMed PMID: 20356674.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Adsorption of Pb(II) ions from aqueous solution by native and activated bentonite: kinetic, equilibrium and thermodynamic study. AU - Kul,Ali Riza, AU - Koyuncu,Hülya, Y1 - 2010/03/09/ PY - 2009/11/06/received PY - 2010/01/27/revised PY - 2010/03/03/accepted PY - 2010/4/2/entrez PY - 2010/4/2/pubmed PY - 2010/8/13/medline SP - 332 EP - 9 JF - Journal of hazardous materials JO - J Hazard Mater VL - 179 IS - 1-3 N2 - In this study, the adsorption kinetics, equilibrium and thermodynamics of Pb(II) ions on native (NB) and acid activated (AAB) bentonites were examined. The specific surface areas, pore size and pore-size distributions of the samples were fully characterized. The adsorption efficiency of Pb(II) onto the NB and AAB was increased with increasing temperature. The kinetics of adsorption of Pb(II) ions was discussed using three kinetic models, the pseudo-first-order, the pseudo-second-order and the intra-particle diffusion model. The experimental data fitted very well the pseudo-second-order kinetic model. The initial sorption rate and the activation energy were also calculated. The activation energy of the sorption was calculated as 16.51 and 13.66 kJ mol(-1) for NB and AAB, respectively. Experimental results were also analysed by the Langmuir, Freundlich and Dubinin-Redushkevich (D-R) isotherm equations at different temperatures. R(L) separation factor for Langmuir and the n value for Freundlich isotherm show that Pb(II) ions are favorably adsorbed by NB and AAB. Thermodynamic quantities such as Gibbs free energy (DeltaG), the enthalpy (DeltaH) and the entropy change of sorption (DeltaS) were determined as about -5.06, 10.29 and 0.017 kJ mol(-1) K(-1), respectively for AAB. It was shown that the sorption processes were an endothermic reactions, controlled by physical mechanisms and spontaneously. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/20356674/Adsorption_of_Pb_II__ions_from_aqueous_solution_by_native_and_activated_bentonite:_kinetic_equilibrium_and_thermodynamic_study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(10)00315-8 DB - PRIME DP - Unbound Medicine ER -