Adsorption of Dodecylbenzene Sulfonate on Na+-montmorillonite: Effect of Salt Impurities1
- David M. Clementz2 and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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