Adsorption of benzidine by montmorillonite and Alumina pillared montmorillonite

The interaction of montmorillonite (non pillared clay) and alumina pillared montmorillonite (Al PILC) with benzidine results in the formation of colored complexes of benzidine blue and benzidine yellow. The amount of adsorbed benzidine from an aqueous solution of benzidine dihydrochloride is measured quantitatively on the non pillared clay and the Al PILC. Under conditions of controlled pH, the amount of adsorbed benzidine by both substrates increases as the pH of the solution and the amount of added benzidine increase. The amount of adsorbed benzidine by alumina pillared clay is less than that by the non pillared clay under the same reaction conditions.