Abstract
The adsorption of anionic ethoxy surfactants on kaolinite at room temperature has been studied as a function of pH and added electrolyte concentration (NaCl or CaCl 2). Adsorption from NaCl follows previous observations, with adsorption increasing with decreasing pH and increasing NaCl concentration. Adsorption from CaCl 2 shows much different behavior, with adsorption being high at acidic and basic pH's, and going through a shallow minimum at approximately pH = 8. Furthermore, adsorption is not dependent on CaCl 2 concentration above a certain minimum concentration. The observed behavior is interpreted in terms of the ability of Ca +2 to form a calcium-surfactant complex which can adsorb on the clay. Point of zero charge and surface area measurements were also made and support the above interpretation.
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