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Simultaneous sorption and diffusion of a 4‐aminoazobenzene derivative and its conjugate acid in cellulose membrane carrying sulfonic acid groups
Author(s) -
Shibusawa Takao,
Weber Ruth,
Rys Paul
Publication year - 1989
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1989.070371211
Subject(s) - cationic polymerization , sulfonic acid , chemistry , membrane , sorption , conjugate acid , aqueous solution , cellulose , ion exchange , polymer chemistry , permeation , adsorption , nuclear chemistry , inorganic chemistry , organic chemistry , ion , biochemistry
An azo dye, 2‐methyl‐ N,N ‐bis(2‐hydroxyethyl)‐4‐aminoazobenzene (nonionic dye) and its conjugate acid (cationic dye) are simultaneously adsorbed by the cellulose membranes carrying sulfonic acid groups from a slightly acidic aqueous solution. Sorption equilibria of the nonionic and the cationic dye are described in terms of the Henry's partition and the ionic exchange mechanism, respectively, in the latter case, the ion exchange constants obtained for the membrane with sulfonic acid group content (SAG) = 261 meq/kg at 30°C are K Na DH= 1.43 × 10 −5 and K H DH= 0.542, respectively, where Na, H, and DH refer to sodium, hydrogen, and cationic dye ions. The diffusion coefficients of the nonionic dye ( D N ) and the cationic dye ( D C ) in the membranes were estimated from the permeation data of the dyes through the membrane. Both D N and D C decrease with increasing SAG. The ratio D N / D C ranged in 2.2–10, the ratio increases with the SAG.