Equilibrium adsorption isotherms for wool/detergent systems: I. The adsorption of sodium dodecyl sulfate by wool

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Abstract

Isotherms for the equilibrium adsorption of sodium dodecyl sulfate on to wool at 40°C. and 60°C. under neutral conditions were determined. There was no increase in the adsorption once the concentration in the equilibrium solution exceeded the c.m.c. In the presence of 0.1 M sodium chloride, the saturation uptake was almost doubled. The amount adsorbed was considerably less than that found for the adsorption of sodium dodecyl sulfate on epidermal keratin. Adsorptions below 40°C. indicate that, for low concentrations (4 × 10−4 M) of detergent in the equilibrium solution, considerably more detergent is adsorbed below 35°C. than above this temperature.

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