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Abstract
Potassium (K) sorption by calcium bentonite is influenced by temperature variations. In the present investigation, the kinetics of K adsorption from a solution to exchangeable sites of clay were studied using bentonite samples which had been saturated with calcium (Ca) in the form of CaCl2. Potassium adsorption was studied using a 100 mg K/L solution and equilibrated for 3, 5, 7, 10, 12,15, 20, 25, 30, and 35 minutes and 1, 2, 8, and 24 hours at 5, 20, 30, 40, and 50°C. It was found that the K‐Ca exchange is a kinetically controlled process at low temperatures although it is thermodynamically controlled at higher temperatures The reversible first order kinetic model was fitted on analytical results and was found to give a good description of K‐Ca exchange process. Thermodynamic quantities, ?G°, ?H°, and ?S° were also calculated.
Notes
University of Athens, Department of Chemistry, Panepistimiopolis‐Zografou, Athens 15771, Greece. Postal address of the corresponding author: A. Ioannou, 14 Thermopillon st., 15344 Palini, Athens, Greece.