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This article in SSSAJ

  1. Vol. 40 No. 5, p. 663-665
    Received: Mar 8, 1975



Adsorption of Dodecylbenzene Sulfonate on Na+-montmorillonite: Effect of Salt Impurities1

  1. David M. Clementz2 and
  2. John L. Robbins3



The adsorption of purified dodecylbenzene sulfonate (ABS) on Na+-montmorillonite follows the Langmuir isotherm, reaching a maximum amount adsorbed which corresponds to the anion exchange capacity of the clay. When a commercial grade ABS (containing 60% Na2SO4) is used, the adsorption process is more complex and occurs in two distinct steps. In dilute solutions, the salt impurity has a minor effect on adsorption and the result is essentially the same as that obtained for the purified surfactant. However, as the salt concentration is increased to a given value, enhanced adsorption due to hemimicelle formation occurs.

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