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Abstract

EFFECT OF GAMMA IRRADIATION ON KINETICS OF ION EXCHANGE OF Zn (II), Co (II), Pb (II), Mg (II) ON DOWEX 50 WX8 (NH4+) IN AQUEOUS ACETONE – AMMONIUM BUTYRATE MEDIA.

*Kamble R. S.

.

Abstract

During the last few years many varieties of organic and inorganic exchangers have been synthesized and employed with notable success in every field of science and industry. Of the large number of ion exchangers identified as potentially useful in nuclear process industry, the vast majority of ion exchangers used today are synthetic organic resins. However, these materials are quite susceptible to radiation chemical decomposition and present knowledge is inadequate to provided meaningful mechanistic interpretations of many of the problems resulting from their radiation damage. It was thus of interest to examine the physiochemical parameters of resins. Many factors change the ion exchange kinetics including exchange capacity, moisture content, cross linkages, rate of diffusion, concentrations of ionic species in solution which in turn are influenced by radiation.[1-4] Hence the kinetics also should be affected by gamma irradiation treatment. With this view kinetic studies ion exchange reactions with various metal ions like Zn, Pb, Mg, and Co have been made on un-irradiated and gamma irradiated resins. In case of ion exchangers having a polymeric organic matrix, the cation of radiation leads to the following characteristics reactions. 1. Breakdown or loss of functional groups. 2. Formation of new functional groups. 3. De-polymerization of the matrix. 4. Cross linkage of the matrix. 5. Colour change of the resin. As a result of these reactions, there can be observed changes in the capacity and basicity of the functional groups as well as variations in the swelling and consequently sorption characteristics of the exchanger. Increase or decrease in the moisture contents, loss in weight of the resin are some of the changes which can occur as a result of gamma irradiation of the resin.

Keywords: Gamma irradiated and un-irradiated resin, aqueous acetone - ammonium butyrate, diffusion coefficient (D), rate constant (K), half exchange time (t1/2), inter-diffusion coefficient (D).


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