Properties and Characterization of Ion Exchange Resins

The use of ion exchange resins and natural or synthetic inorganic exchange materials in the nuclear industry is well documented ( ). In the waste solidification application, the titanates or niobates offer no unique sorption properties. They do, however, provide a relatively high overall sorption capacity for a variety of nuclides in materials which can be converted into a stable ceramic host for the sorbed ions. After the sorption process, the column bed must be consolidated to reduce surface area. The project emphasis was directed toward a stable waste form and a considerable effort was devoted to producing and characterizing a highly dense form with favorable physical, chemical and thermal properties (l ). 

Just like activated carbons and hydrous oxides, potentiometric titration can be used to characterize the acid-base surface properties of the resins (4—8,12,15-19). The ionization reactions and the constants (pK values) can be determined according to the titration data. For example, Chen and co-workers reported a successful case of characterization of a cation resin—a calcium alginate based ion exchange resin (CABIER) (17). The study included three steps ... 

After having characterized the kinetic and equilibrium properties of the individual fractions of the ion exchanger, it should now be possible to describe quantitatively the kinetics of the Cs /H exchange in an arbitrary mixture of the resin fractions without further adjustment of parameters. The experiment consisted in this case of stirring simultaneously 0.2 g air dry ion exchanger in the form of each of the above size fractions (corresponding to Q, = 0.842 mequiv i = 1-5) in the solution, while the initial and boundary conditions were the same as for the individual fractions described above (initially only Cs ions in solution c,q, = 0.00662 M, V = 302 mL = 3.16). The experimentally observed decrease of Cs ions in solution as a function of time (again determined by an immersed conductivity probe) is shown in Fig. 2 (top). To calculate this rate curve, Eq. 

So, far no resin based on p-ciesol-adipamide-formaldehyde in DMF medium has been reported for the quantitative removal and separation of transition and post transition metal ions. As industrial effluents are often rich in transition and post transition metal ions, removal of these metals is an important industrial task. The work described in the present commimication deals with the syrrthesis, characterization and the systematic studies of various ion-exchange properties of the resin. 

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