Efficient Removal of from Aqueous Solutions by Adsorption on PS-EDTA Resins: Equilibrium, Isotherms, and Kinetic Studies
Publication: Journal of Environmental Engineering
Volume 138, Issue 9
Abstract
Batch adsorption experiments were conducted using environment-friendly prepared chelating ethylenediaminetetraacetic sodium modified polystyrene-based (PS-EDTA) resins as an adsorbent to adsorb from aqueous system in which experimental parameters were studied including solution pH, adsorbent dose, contact time, initial metal concentration and temperature. The Langmuir, Freundlich, and Dubinin-Radushkevich (DR) isotherm models were employed to analyze the experimental data among which Freundlich isotherm model was found to be suitable for adsorption. In addition, adsorption on PS-EDTA resins fitted well to the pseudo-second-order kinetic model. Intraparticle diffusion studies revealed that surface adsorption and intraparticle diffusion were both involved in the adsorption of ions. Thermodynamic parameters such as Gibbs free energy (), enthalpy change (), and entropy change () were calculated and indicated that adsorption of ions onto PS-EDTA resins was a spontaneous and endothermic process. The effects of various salts and coexisting heavy metal ions on ions adsorption were also investigated. Moreover, the results from the sequential adsorption–desorption cycles showed that PS-EDTA resins held good reusability and this could be a potential application in the fixed-bed continuous-flow column for the removal of heavy metals.
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Acknowledgments
The authors gratefully acknowledge financial support from the National Major Specific Program of Science and Technology on Controlling and Administering of Water’s Pollution (2009ZX07212-001-04), the Sustentation Program of Science and Technology of China (2006BRD01B03), and the scientific research ability training of undergraduate students majoring in chemistry by the two patters based on the tutorial system and top students (J1103307).
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Published In
Journal of Environmental Engineering
Volume 138 • Issue 9 • September 2012
Pages: 940 - 948
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Jul 20, 2011
Accepted: Feb 17, 2012
Published online: Feb 21, 2012
Published in print: Sep 1, 2012
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