Adsorption of acrylamide-based copolymers from aqueous solutions on clay granules

The equilibrium adsorption of three samples of high-molecular-mass acrylamide-sodium acrylate copolymers with a degree of ionization of 7?C34% from concentrated aqueous solutions on Khvalynsk clay granules with sizes of 1?C2 mm is investigated. The adsorption is studied under dynamic conditions in the absence of inorganic electrolytes at an initial concentration of copolymers in the solutions of 2 g/L. It is established that copolymer adsorption decreases with an increase in the content of the adsorbent. Copolymer with a low degree of ionization is adsorbed more intensely than the other samples are. Adsorption curves are described by the Freundlich equation. The parameters of this equation are determined as functions of the initial pH value and the content of charged groups. The influence of the degree of polymer chain ionization on the density of adsorption contacts of macromolecules with the adsorbent surface is discussed.