The nature of ion exchange selectivity of phenol-formaldehyde sorbents with respect to cesium and rubidium ions

Kargov, S.I.; Shelkovnikova, L.A.; Ivanov, V.A.

Авторы: Kargov S.I., Shelkovnikova L.A., Ivanov V.A.
Журнал: Russian Journal of Physical Chemistry A
Том: 86
Номер: 6
Год издания: 2012
Издательство: Pleiades Publishing, Ltd
Местоположение издательства: Road Town, United Kingdom
Первая страница: 860
Последняя страница: 866
DOI: 10.1134/S0036024412050159
Аннотация: The structure of aqua complexes of alkali metal ions Me+(H2O)n, n = 1–6, where Me is Li, Na, K, Rb, and Cs, and complexes of 2,6dimethylphenolate anion (CH3)2PhO– selected as a model of the elementary unit of phenolformaldehyde ion exchanger with hydrated alkali metal cations Me+(H2O)n, n = 0–5, was studied by the density functional method. The energies of successive hydration of the cations and the energies of binding of alkali metal hydrated cations with (CH3)2PhO– depending on the number of water molecules n were calculated. It was shown that the dimethylphenolate ion did not have specific selectivity with respect to cesium and rubidium ions. The energies of hydration and the energies of binding of alkali metal cations with (CH3)2PhO– decreased in the series Li+ > Na+ > K+ > Rb+ > Cs+ as n increased. The con clusion was drawn that the reason for selectivity of phenolformaldehyde and other phenol compounds with respect to cesium and rubidium ions was the predomination of the ion dehydration stage in the transfer from an aqueous solution to the phenol phase compared with the stage of binding with ion exchange groups.
Добавил в систему: Иванов Владимир Александрович

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The nature of ion exchange selectivity of phenol-formaldehyde sorbents with respect to cesium and rubidium ionsстатья

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