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Corresponding Author

WASSEL, M.

Document Type

Original Article

Subject Areas

Chemistry

Keywords

Cation exchange resin; lead (II) ions; Adsorption kinetics; adsorption mechanism; organic acids

Abstract

In the present study we investigated the adsorption kinetics and isotherm models of Pb(II) removal by ResinexTM K-8 strong acid cation exchange resin at different temperatures. Adsorption kinetics is investigated to develop an understanding of controlling reaction pathways (e.g. chemisorptions versus physisorption) and the mechanisms (e.g. surface versus intraparticle diffusion) of adsorption reactions. Kinetic data can be used to predict the rate at which the target contaminant is removed from aqueous (pure water) and aqueous-organic solutions (formic, acetic, propionic) and equilibrium adsorption isotherms are used to quantify the adsorptive capacity of an adsorbent. The results can be used to assess the utility of the adsorbent for the heavy metal removal, in particular Pb(II) ions adsorption, in the field scale. Thermodynamic parameters, the Gibbs free energy change (∆G), enthalpy change (∆H), and entropy change (∆S), were calculated and show that adsorption of Pb(II) ions is spontaneous and endothermic in nature.

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