Phenomenon of excess equivalent exchange in partially dissociated ion exchange environments

Abstract

The equation of the isotherm in excess of the equivalent of the binary ion exchange Langmuir type
by Nikolsky − with gross-ion separation coefficient and sorption capacity, depending on the concentration of
dissociated functional groups and the electrolyte absorbed in the ion exchanger was derived. The
interconnection of each of these two functions, the state with the concentration and composition of the
equilibrium solution of a strong electrolyte − depending on individual absorption nonexchangeable
thermodynamic constants to counterions and co-ions from a solution and constants constants of stability of
ion pairs was set too. It is shown that the concentration of the electrolyte absorbed and dissociated functional
groups in ion exchange change in full accordance with Le Chatelier's principle.
The results can be used as a tool to 1) identify individual thermodynamic constants non exchange
sorption and stability of ion pairs formed in ion exchanger based on regression analysis of real absorption
isotherm of electrolyte; 2) calculation of isotherms of excess equivalent gross-ion exchange ion exchange,
Кузьминых и др. / Сорбционные и хроматографические процессы. 2015. Т. 15. Вып. 1
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dissociation of ion exchangers and absorption of the electrolyte; 3) real-time quantitative analysis and
prediction of equilibrium state and composition of ion-exchangers over a wide range of concentrations and
the actual composition of the external solution.