Dimensionless groups for the sorption of dye and other ions by polymers. II. Hydrochloric acid, C.I. acid blue 25, and polyamides with an excess of basic groups

The equations of a generalized Donnan model have been used in dimensionless form to describe and analyze the sorption of hydrochloric acid and of C.I. Acid Blue 25 by polyamide fibers containing an excess of basic groups. The method is applicable to a wide variety of ionic sorption systems, and removes some of the restrictions of earlier treatments of the problem. Acid–base reactions, ion exchange processes, electrolyte sorption, and both ion binding and zwitterion formation have been considered.