Ion-Exchange Equilibria of Nitrates on a Strongly Basic Resin

Abstract

Adsorption isotherms of nitrates on the resin Amberlite IRA 410 at various pH values (6.8-12) were experimentally determined by batch tests. Six models involving two or three parameters are discussed. Concerning the Langmuir equation, the linear method had no significant effect on the estimation of isotherm parameters and simulation precision. Irrespective of the pH, the Sips model was found to give the best fit of the adsorption isotherm data. The maximum adsorption capacity decreased with increasing pH values and could be predicted by the correlation equations obtained in this study. Adsorption isotherms of nitrates on the resin Amberlite IRA 410 at various pH values (6.8-12) were examined. Two- and three-parameter models are discussed. Irrespective of the pH, a modified Sips model was found to match best the adsorption isotherm data. The maximum adsorption capacity decreased with increasing pH values and could be predicted by the correlation equations obtained. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.