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Abstract
The sorption of potassium (K) on calcium‐bentonite was studied by examined two parameters, the initially added concentration of KCl and the pH. Generally was found that the amount of adsorbed K increased as pH and initial concentration increased although the sorption at pH 7.0 shows a different behaviour. The common and a modified form of Langmuir, the Freundlich, and the Temkin isotherms were fitted to K sorption data for calcium‐bentonite (Ca‐b) at pH range 4.0 ‐ 9.0. Langmuir isotherm in its commonly used form was found to be unacceptable for pH 4.0, 5.0, 6.0, 8.0 and 9.0. On the other hand modified Langmuir, Freundlich, and Temkin were found to describe K sorption data for all pH values with comparable success, with the modified type of Langmuir being slightly superior (r2 = 0.998).
Notes
Corresponding author, University of Athens, Athens, Greece. Mailing address: 14 Thermopillon St., 15344, Pallini, Athens, Greece.