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Removal of potassium is carried out by lime loaded rice husk carbon (LRHC). The extent of removal depends on initial concentration of potassium in solution, pH of the solution, carbon dosage, temperature etc. As the concentration of potassium is increased, the removal of potassium is decreased. When the adsorbent dosage is increased from 1 g to 4 g, the removal of potassium from the salt solution is increased. As the pH increased from 3 to 6, the removal of potassium had been decreased. The amount of potassium removed increases from pH 6 to 7. Freundlich and Langmuir adsorption isotherm models indicate the occurrence of adsorption. Thermodynamic parameters show the biosorption is endothermic and non-spontaneous. Kinetics shows the adsorption is first order reaction. IR spectrum indicates the adsorption is physisorption. SEM and EDX studies show the adsorption of potassium on the carbon.

Removal of potassium from aqueous system by lime loaded rice husk carbon