Investigation on Rhenium Ions Adsorption Properties from Single Component Solutions on Purolite A170 Resin by Equilibrium and Kinetics Modeling

In present study kinetics and equilibrium isotherms models were used in static / batch technique to demonstrate phenomena involving in the process of Rhenium ions uptake on Purolite A170 ionite. In order to realize the adsorption mechanism, four widely used adsorption isotherm models were subjected in detail. The results suggested that in general all models applied generate a satisfactory fit on laboratory data but both Freundlich and D-R isotherm models showed the selectivity coefficient (R2) more than 0.99, and so they can be used to track the equilibrium of the process. Also, in current conditions the maximum monolayer coverage capacities (qm) from the Langmuir isotherm was calculated to be 166.67 mg/g. Modeling of the batch kinetic adsorption was performed by pseudo first order, pseudo second order, Elovich and Intraparticle diffusion equations. The analysis of the results showed that the pseudo second order model can define the adsorption rate properly than others.