Polyfunctionality and Equilibrium Selectivity Coefficient of Ion-exchange System. Part II-lnteraction of Some Monovalent Ions with H-Co(pn)3-Bentonite and Na-Co(pn)3-Bentonite
| Main Authors: | G. N. SARKAR, J. L. DAS KANUNGO |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1981
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6420455 |
Daftar Isi:
- Department of Chemistry, University of North Bengal, Dist. Darjeeling-734 430, West Bengal Manuscript received 30 March 1981, revised 5 June 1981, accepted 11 August 1981 The extent to which the polyfunctional character of bentonite influences the ion exchange behaviour of Co(pn)\(_3^3\)+on and from H+ and Na+ forms of bentonite against different monovalent inorganic ions has been investigated at 25o. The sequence of equilibrium selectivity coefficients i.e., Li+<Na+<K+<NH\(_4^+\)<Rb+<Cs+ for the exchange of Co(pn)\(_3^3\)+ from H-Co(pn)3,-bentonite and Na-Co(pn)3-bentonite remains unaltered in both the systems. However, there are significant differences in the values of the selectivity coefficients for each desorbing ion between the two clay systems. The experimental results would, therefore, suggest that bentonite behaves as a strong cation exchanger although it shows polyfunctional properties. The plot of log (selectivity coefficient) vs the reciprocal of the Debye Hilckel parameter, ao, yields linear curves. This implies that in such a process of exchange of Co(pn)\(_3^3\)+ by monovalent ions, the electrostatic attraction between the counter ions and the fixed ionic groups is the determining factor and the parameter ao of the ions may be used to correlate the relative affinities of the ions for the mineral.