Adsorption of Benalate on Fe-and AI-Montmorillonites

Adsorption of benalate has been studied on Al-and Fe-montmorillonites with time, pH and temperature as variables. Equilibrium was attained within 40h, maximum adsorption occurred at pH 6.5. The adsorption decreased with increase in temperature. Adsorption isotherms were of ‘S’ type. Adsorption isotherms and desorption experiments provided evidence for a partly chemisorption and partly physical adsorption of benalate on clay surface. Inferences on the coordination and/or protonation of the metallic cations of clay surface to the carbonyl on amide group found support from adsorption isotherms, desorption, X-ray and IR studies.