Abstract
The characteristics of hydration of iminocarboxylic and aminophosphonic ion exchangers in the copper and nickel forms are obtained and compared to the selectivity of the polyampholytes to cations. It is found that the exchange of both cations is accompanied by the rearrangement of the first hydration shell of the sorbents, namely, an increase in the amount of water in the aminophosphonic ion exchanger and a decrease, in iminocarboxylic. The formation of coordinate ionic bonds between the functional groups of the ion exchangers and counterions decreases the total amount of the solvent in the sorbent. The advantage of using the sodium form for the sorption of cations manifests itself in the low values of the Gibbs energy of interfacial transfer of water, decrease in the total amount of hydration water, and increase in the energy of hydration of polyampholytes upon the transition to the form of the cation being extracted.
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This work was performed in accordance with Coordination Plan of the “Adsorption Phenomena” Section of the Scientific Council of the Russian Academy of Sciences on Physical Chemistry, no. 20-03-460-06.
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Translated by E. Boltukhina
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Bondareva, L.P., Peregudov, Y.S. & Gapeev, A.A. Energy Characteristics of Hydration of Synthetic Polyampholytes and Their Selectivity to Copper(II) and Nickel(II) Cations. Prot Met Phys Chem Surf 58, 22–27 (2022). https://doi.org/10.1134/S2070205122010051
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DOI: https://doi.org/10.1134/S2070205122010051