Mutual Effect of Mineral Salt and Amino Acid in Their Sorption by Heterogeneous Ion-Exchange Membranes

• Published in: Russian Journal of Physical Chemistry A Vol. 95; no. 10; pp. 2118 - 2124
• Main Authors: Kharina, A. Yu, Eliseeva, T. V., Selemenev, V. F.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.10.2021; Springer Nature B.V
• Subjects: Amino acids; Cation exchanging; Chemistry; Chemistry and Materials Science; Ion exchange; Membranes; Moisture content; Physical Chemistry; Physical Chemistry of Surface Phenomena; Sorption; hydrophobicity; ion-exchange membrane; amino acid; sorption; moisture content; mutual influence
• ISSN: 0036-0244; 1531-863X
• DOI: 10.1134/S0036024421100125

A study is performed of features of sorption by heterogeneous ion-exchange membranes of aliphatic and aromatic amino acids with various side groups from individual solutions and solutions containing different mineral salts. One of the most important factors that determines membrane capacity in the sorption of amino acid and mineral salt ions from mixed solutions is the volume of the amino acid side groups, a rise in which reduces of the amount of the sorbed ampholyte. The quantity of amino acid sorbed by a cation exchange membrane from a mixed solution is lower than from the individual solution. The larger the radius of the hydrated cation of the mineral salt, the greater the amount of amino acid sorbed by the membrane from the mixed solution. The change in the hydration of membranes that sorb amino acids is established. The highest content of strongly bound water in the membrane phase is observed for the sorption of the most hydrated amino acid in a solution. The moisture content of the membrane and the hydrophilicity of its surface fall during the sorption of the amino acid with more hydrophobic side group.