Effect of adsorption by cellulose acetate membrane on reverse osmosis of some monoamino monocarboxylic and monoamino dicarboxylic acids in aqueous solutions.

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Taft's polar and steric parameters, Σσ*, ΣEs, and nonpolar parameter, ΣS* governing the reverse osmosis of nonionized polar aliphatic and alicyclic organic compounds using a cellulose acetate membrane were also applicable to aliphatic monoamino monocarboxylic acids having zwitter ion structure. These three parameters were further extended so as to include the cases of sulfur-containing amino acids, hydroxy-substituted, and aromatic type amino acids. Reverse osmosis of monoamino monocarboxylic acids in binary aqueous solution systems containing L-alanine was carried out. As a result, added amino acids were adsorbed by the membrane when added in low concentration (<0.001 mol dm−3), and the permeation of L-alanine was governed by the difference of Taft's polar parameter between L-alanine and the added amino acid. Reverse osmosis of monoamino dicarboxylic acids indicated that hydrogen ions were adsorbed by the membrane, and the adsorption isotherms of hydrogen ions were approximately represented by the Langmuir formula for each amino acid. The electrostatic repulsion between R− ionic species in monoamino dicarboxylic acid and the negatively dissociated groups of the membrane was weakened by neutralization of the membrane by hydrogen ion adsorption, resulting in decreased amino acid rejection. It was noted that the ultraviolet spectrum and the titration curve of permeate of amino acids were different from those of the feed solution; relationship between this phenomenon and adsorption of hydrogen ions was investigated.
公益社団法人日本化学会の論文

Effect of adsorption by cellulose acetate membrane on reverse osmosis of some monoamino monocarboxylic and monoamino dicarboxylic acids in aqueous solutions.

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