Тhe kinetics of the sorption-desorption of chromium(III) with the iminodicarboxilic ion exchanger Purolite S930Plus

Abstract

The influence of the granules size, stirring intensity and temperature on the kinetic of the
sorption of Cr(III) with the iminodicarboxilic ion exchanger Purolite S930Plus out of 0,5 M solution
Na2SO4 and its desorption out of this exchanger by 1 M solution H2SO4 have been investigated. The
estimation of values of effective activation energies of processes of the sorption and the desorption of
Cr(III) (44,3 ± 5,9 kJ/mol and 65,9 ± 4,7 kJ/mol accordingly) has been given. On the basis of values of
effective activation energies and the motion of dependences - lg(1 - F) from t and F from √t it has been
done conclusion, that the speed limiting stage of the process of the sorption of chrome(III) on the ionexchanger
of Purolite S930Plus could be simultaneously the internal diffusion and the chemical reaction,
while the speed limiting stage of the desorption of Cr(III) was the chemical reaction.