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Removal of zirconium from aqueous solution by modified clinoptilolite.
J Hazard Mater. 2010 Jun 15; 178(1-3):66-73.JH

Abstract

Adsorptive behavior of natural clinoptilolite was assessed for the removal of zirconium from aqueous solutions. Natural zeolite was characterized by X-ray diffraction, X-ray fluorescence, thermal methods of analysis and FTIR. The zeolite sample composed mainly of clinoptilolite and presented a cation exchange capacity of 1.46 meq g(-1). K, Na and Ca-exchanged forms of zeolite were prepared and their sorption capacities for removal of zirconium from aqueous solutions were determined. The effects of relevant parameters, including initial concentration, contact time, temperature and initial pH on the removal efficiency were investigated in batch studies. The pH strongly influenced zirconium adsorption capacity and maximal capacity was obtained at pH 1.0. The maximum removal efficiency obtained at 40 degrees C and equilibration time of 24h on the Ca-exchanged form. Kinetics and isotherm of adsorption were also studied. The pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion models were used to describe the kinetic data. The pseudo-second-order kinetic model provided excellent kinetic data fitting (R(2)>0.998) with rate constant of 1.60x10(-1), 1.96x10(-1), 2.45x10(-1) and 2.02x10(-1)g mmol(-1)min(-1) respectively for Na, K, Ca-exchanged forms and natural clinoptilolite. The Langmuir and Freundlich models were applied to describe the equilibrium isotherms for zirconium uptake and the Langmuir model agrees very well with experimental data. Thermodynamic parameters were determined and are discussed.

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Authors+Show Affiliations

Faghihian H
Department of Chemistry, University of Isfahan, 81746-73441, Isfahan, Iran. h.faghih@sci.ui.ac.ir
Kabiri-Tadi M
No affiliation info available

MeSH

AdsorptionAlgorithmsCationsHydrogen-Ion ConcentrationIon ExchangeKineticsLeast-Squares AnalysisSolutionsSpectroscopy, Fourier Transform InfraredTemperatureThermodynamicsX-Ray DiffractionZeolitesZirconium

Pub Type(s)

Journal Article

Language

eng

PubMed ID

20185237

Citation

Faghihian, H, and M Kabiri-Tadi. "Removal of Zirconium From Aqueous Solution By Modified Clinoptilolite." Journal of Hazardous Materials, vol. 178, no. 1-3, 2010, pp. 66-73.
Faghihian H, Kabiri-Tadi M. Removal of zirconium from aqueous solution by modified clinoptilolite. J Hazard Mater. 2010;178(1-3):66-73.
Faghihian, H., & Kabiri-Tadi, M. (2010). Removal of zirconium from aqueous solution by modified clinoptilolite. Journal of Hazardous Materials, 178(1-3), 66-73. https://doi.org/10.1016/j.jhazmat.2010.01.044
Faghihian H, Kabiri-Tadi M. Removal of Zirconium From Aqueous Solution By Modified Clinoptilolite. J Hazard Mater. 2010 Jun 15;178(1-3):66-73. PubMed PMID: 20185237.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Removal of zirconium from aqueous solution by modified clinoptilolite. AU - Faghihian,H, AU - Kabiri-Tadi,M, Y1 - 2010/01/18/ PY - 2009/05/24/received PY - 2010/01/02/revised PY - 2010/01/09/accepted PY - 2010/2/27/entrez PY - 2010/2/27/pubmed PY - 2010/7/14/medline SP - 66 EP - 73 JF - Journal of hazardous materials JO - J Hazard Mater VL - 178 IS - 1-3 N2 - Adsorptive behavior of natural clinoptilolite was assessed for the removal of zirconium from aqueous solutions. Natural zeolite was characterized by X-ray diffraction, X-ray fluorescence, thermal methods of analysis and FTIR. The zeolite sample composed mainly of clinoptilolite and presented a cation exchange capacity of 1.46 meq g(-1). K, Na and Ca-exchanged forms of zeolite were prepared and their sorption capacities for removal of zirconium from aqueous solutions were determined. The effects of relevant parameters, including initial concentration, contact time, temperature and initial pH on the removal efficiency were investigated in batch studies. The pH strongly influenced zirconium adsorption capacity and maximal capacity was obtained at pH 1.0. The maximum removal efficiency obtained at 40 degrees C and equilibration time of 24h on the Ca-exchanged form. Kinetics and isotherm of adsorption were also studied. The pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion models were used to describe the kinetic data. The pseudo-second-order kinetic model provided excellent kinetic data fitting (R(2)>0.998) with rate constant of 1.60x10(-1), 1.96x10(-1), 2.45x10(-1) and 2.02x10(-1)g mmol(-1)min(-1) respectively for Na, K, Ca-exchanged forms and natural clinoptilolite. The Langmuir and Freundlich models were applied to describe the equilibrium isotherms for zirconium uptake and the Langmuir model agrees very well with experimental data. Thermodynamic parameters were determined and are discussed. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/20185237/Removal_of_zirconium_from_aqueous_solution_by_modified_clinoptilolite_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(10)00077-4 DB - PRIME DP - Unbound Medicine ER -