Equilibrium isotherm and kinetic modeling of the adsorption of nitrates by anion exchange Indion NSSR resin

This paper describes the adsorption capacity of ion exchange Indion NSSR resin for removal of nitrates from aqueous solution. Adsorption capacity of resin was investigated under different conditions viz variations in adsorbent dose, initial concentrations of nitrate and pH. The fitting of the Freund...

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Bibliographic Details
Published in:	Desalination Vol. 276; no. 1-3; pp. 38 - 44
Main Authors:	Milmile, Sachin N., Pande, Jayshri V., Karmakar, Shilpi, Bansiwal, Amit, Chakrabarti, Tapan, Biniwale, Rajesh B.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 02-08-2011 Elsevier
Subjects:	Adsorbents Adsorption Adsorption isotherm anion exchange Applied sciences Aqueous solutions Chemical engineering desalination Exact sciences and technology Ion exchange Isotherms Kinetics Mathematical models Nitrate Nitrates Pollution Polymers Resin Resins sorption isotherms Greek letters: β Ce τ E Ci Adsorption isotherm Xe Ct R qe Resin kf ki Rp q0 b Df qt k1 k2 Dp m n q Nitrate t ε v Kinetics Ut Adsorption capacity Modeling Langmuir isotherm Sorption Kinetic model Adsorption Batchwise First order pH Aqueous solution Diffusion Ion exchange
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Summary:	This paper describes the adsorption capacity of ion exchange Indion NSSR resin for removal of nitrates from aqueous solution. Adsorption capacity of resin was investigated under different conditions viz variations in adsorbent dose, initial concentrations of nitrate and pH. The fitting of the Freundlich, Langmuir and Dubinin–Radushkevich adsorption models to the equilibrium data was investigated. The equilibrium data obtained in this study were found to follow the Langmuir adsorption isotherm. The maximum sorption capacity was 119mg/g as per Langmuir isotherm at 35°C under this particular study. The rate parameters for the intra particle diffusion have been estimated for different initial concentrations. In batch adsorption processes, the adsorbate molecules diffuse in porous adsorbent and rate process usually depends on t0.5 rather than the contact time. The nitrate adsorption on Indion NSSR resin from aqueous solution follows first order reversible model. The nitrate adsorption capacity of ca 77mg/g was observed for the Indion NSSR resin from the column study with specific conditions of operation. ► High adsorption capacity of Indion NSSR resin for removal of nitrate. ► Estimation of various adsorption isotherms for designing nitrate removal treatment. ► Resin provides potential for nitrate removal and subsequent catalytic reduction.
Bibliography:	http://dx.doi.org/10.1016/j.desal.2011.03.015 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0011-9164 1873-4464
DOI:	10.1016/j.desal.2011.03.015