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Ion Exchange Equilibria of Cobalt(II)-M-hexacyanoferrates(II) with K, NH4 and Cs

Abstract The inorganic ion exchanger cobalt(II)-M-hexacyanoferrate(II), M = K, NH4 and Cs, and its selectivity for the alkali metal ions are defined by their isotherms at three different temperatures and by the calculated thermodynamic functions ΔG°, ΔH° and ΔS°. The thermodynamic data are discussed on the basis of the radii of competing ions as well as on the steric limitations of the ion exchanger phase, i.e., the thermodynamic magnitudes which control the selectivity of those ion exchangers.