THE STUDY OF KINETIC-MODELS FOR LIGAND-EXCHANGE OF ANIONS AS LIGANDS USING LIGAND-EXCHANGE RESIN

A comparative study of kinetic models for ligand exchange of I- --> Cl - and Br- --> Cl- as ligands as a function of pH and concentration usi ng diaminoethyl-sporopollenin (DAE-sporopollenin) resin were investiga ted during the ligand-exchange reaction of the liquid phase. A batch t echnique was employed for the study of the kinetics of I and Br/Cl exc hange as ligands. Five kinetic models were applied to the experimental data. The rate of ligand exchange was increased with decreasing of th e hydrated ionic radius and pH. The curve fitting of the mathematical models and the behavior of the kinetic curves are discussed for direct ligand exchange under the conditions employed. (C) 1997 John Wiley & Sons, Inc.