Removal enhancement of Schiff base (4-hydroxy-6-methyl -2H-pyrane -2-one)-ethylidiimine (ligand) on the surface of initiated calcined Iraqi montmorillonite has been investigated from an aqueous solution via columnar method. The Schiff base removal found to be dependent on initial conc. of the Schiff base, adsorbent dosage, and contact time. All columnar experiments performed at three different pH values (5.5, 7and 8) using buffer solutions at flow rate of (3 drops/ min.), at ambient temperature (25±2) °C. The experimental isotherm data were analyzed using Langmuir, Freundlich and Temkin equations. The monolayer adsorption capacity is 3.0349 mg Schiff base ligand (L) per 1g calcined montmorillonite. This study revealed that highest removal rate 86.89% for Schiff base ligand at pH 5.5. The kinetic data for the adsorption process obeyed pseudo-second-order rate equations.
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