Abstract
The kinetics and mechanism for the ion-exchange processes like Mg2+–H+, Ca2+–H+, Sr2+–H+, Ba2+–H+, Ni2+–H+, Cu2+–H+, Mn2+–H+ and Zn2+–H+ at different temperatures using approximated Nernst–Plank equation under the particle diffusion controlled phenomenon were studied for the poly-o-methoxyaniline Zr(IV) molybdate composite cation-exchanger. Some physical parameters, i.e. fractional attainment of equilibrium U(τ), self-diffusion coefficients (D0), energy of activation (Ea) and entropy of activation (ΔS*) have been estimated. These investigations revealed that the equilibrium is attained faster at higher temperature probably due to availability of thermally enlarged matrix of poly-o-methoxyaniline Zr(IV) molybdate composite cation exchange material. These results are useful for predicting the ion-exchange process occurring on the surface of this cation-exchanger.