Adsorption characteristics of polyacrylamide and sulfonate‐containing polyacrylamide copolymers on sodium kaolinite

Abstract

SynopsisPolyacrylamide and its copolymer containing 6.8 mole % 2-acrylamido-2-methylpropane sulfonic acid were prepared by an irradiation-initiated precipitation polymerization technique. The polymer was characterized by intrinsic viscosity under conditions similar to those used during adsorption measurements. Hydrolytic degradation of the polyacrylamide was found to be negligible under conditions used. The adsorption substrate, sodium kaolinite, was prepared by extensive ion exchange treatment. Equilibrium adsorption of the polymers on the sodium kaolinite was made as a function of polymer concentration, solution pH, ionic strength, and temperature.

Polyacrylamide Na-kaolinite interactions: Effect of electrolyte concentration on polymer adsorption

“…Indeed, coagulation (induced by salt effects) and flocculation (occuring through polymer particle bridging) give rise to a reduction in the area available for polymer adsorption [7]. It has been reported elsewhere that the concentration of electrolyte has no effect on the adsorption of polyacrylamide on Na-kaolinite [16]. The above arguments may explain the discrepancies between our results and others obtained using very concentrated clay suspensions.…”

Polyacrylamide in Agriculture and Environmental Land Management

“…Adsorption of PAM on soil and clay mineral surfaces has been demonstrated to be rapid and irreversible in several studies although the degree of adsorption is dependent on PAM conformation, soil or mineral properties, and soil solution characteristics (Hollander et al, 1981;Nabzar et al, 1984Nabzar et al, , 1988Nadler et al, 1992;Pradip and Fuerstnau, 1980;Tanaka et al, 1990). Because of its high affinity for clay mineral surfaces in soil, PAM becomes concentrated in the upper portions of soil profiles to which it is applied in irrigation water.…”

Study of adsorptive behavior of sulfonated polyacrylamide onto carbonate rock particles to enhance oil recovery

“…Polymer and surfactant are either positive or negative; hence, binding of SLES to SPAM is prevented by the strong electrostatic repulsion between the anionic groups of the polymer and the polar heads of the surfactant molecules. Changes in the conformation of the polymer chains in the presence of anionic surfactant caused by screening of the electrostatic repulsion between groups of polymer charged by the counter-ions of the surfactant species produced significant changes in polymer adsorption [15,32]. Both SPAM and SLES molecules can adsorb onto the surface of carbonate rock particles.…”

“…The effects of other variables on adsorption have also been studied. Hollander et al [15] studied the adsorption of sulfonated polyacrylamides (SPAM) onto kaolinite at different pH values, ionic strengths and temperatures. They concluded that the adsorption of the polymer increased as the ionic strength increased but decreased as the pH decreased and that adsorption was independent of temperature.…”

“…A number of studies [7,[12][13][14][15][16][17] have examined the adsorption of polyacrylamide and its copolymers onto various carriers. Sabhapondit et al [13] investigated the effect of pH and temperature on the adsorptive behavior of poly(N,N-dimethylacrylamideco-Na 2-acrylamido-2-methylpropanesulfonate) copolymer onto the surface of sand.…”