Ion Exchange Kinetics of α-,β-and γ-Picolines: Thermodynamic Parameters

Abstract

The study of ion exchange and sorption equilibria is of great
importance to study the ion exchange resin solute solvent systems.
Kinetic study of a system is generally undertaken to know the
mechanism of the process, to determine the rate controlling step
and to calculate the thermodynamic parameters. This study reports
the uptake of  α, β and  γ-picolines by strongly acidic cation
exchange resin, Dowex 50 WX8 (-20, +50) in H⁺ form from
aqueous methanolic media of different composition. The variables
studied are the rate of stirring, temperature and solvent medium.
The study shows that the systems obey the first order rate laws with
respect to  α, β and  γ-picolines. This paper also reports the thermodynamic
parameters: the apparent energy of activation  ΔE, the
entropy of activation  ΔS and the free energy of activation   ΔG for
different systems studied.