INVESTIGATION OF SOME KINETIC-PARAMETERS FOR M2(-H+ EXCHANGES ON ZIRCONIUM(IV) TUNGSTOPHOSPHATE - A CATION-EXCHANGER())

The kinetics and mechanism for the ion-exchange processes Mg2+-H+, Ca2 +-H+, Sr2+-H+, Ba2+-H+, Zn2+-H+ Cd2+-H+, and Pb2+-H+ at 25 degrees C, 33 degrees C, 45 degrees C, 65 degrees C (+/-1 degrees C) temperatures on zirconium(IV) tungstophosphate were studied using approximated Ner nst-Planck equation under the particle diffusion controlled phenomenon . Some physical parameters, i.e. fractional attainment of equilibrium U-(tau), self diffusion coefficients (D-0), energy of activation (E(a) ) and entropy of activation (Delta S) have been estimated. These inve stigations reveal that the equilibrium is attained faster at higher te mperature probably due to availability of thermally enlarged matrix of zirconium(IV) tungstophosphate cation exchanger.