Kinetic Evaluations for the Sorption Process of Lanthanide Ions with Poly-O-toluidine Zr(IV) Tungstophosphate

Abstract

The kinetic models for sorption of La3+, Ce3+ and Nd3+ ions on poly-o-toluidine Zr(IV) tungstophosphate (POTZr(IV)WP) were investigated under effecting of contact time, initial concentration and temperature. A comparison of kinetic models applied to the adsorption rate data of La3+, Ce3+ and Nd3+ ions on POTZr(IV)WP was evaluated for the pseudo-first order, the pseudo-second order, homogeneous particle diffusion and intra-particle diffusion kinetic models. The results showed that both the pseudo second-order and the homogeneous particle diffusion models were found to best correlate the experimental rate data. The particle diffusion coefficients (Di) and energy of activation (Ea) have been estimated. These investigations revealed that the equilibrium is attained faster at higher temperatures.