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Reaction of Montmorillonite with Iron(III)¹

ABSTRACT

The reaction between montmorillonite and Fe(III) was studied at two different degrees of neutralization of the FeCl₃ solutions. The adsorption of iron was found to reach a definite saturation value which depended on the initial degree of neutralization of the FeCl₃. The maximum amount of Fe(III) adsorbed from FeCl₃ solution, having molar OH/Fe ratio = 2, corresponded to the calculated amount of Fe(III) required to form a complete monolayer of octahedrally coordinated Fe(III) on both planar surfaces of the moutmorillonite. The Fe(III)-montmorillonite complex had a net positive charge at pH 5, which decreased with increase in pH; its cation exchange capacity, however, remained constant at about 45 meq/100 g within the pH range from5 to 7.

¹ Joint contribution from Sección Química, Instituto Venezolano de Investigaciones Cientificas, I.V.I.C., Apartado 1827, Caracas, Venezuela, and Dept. of Agronomy, Cornell University, Ithaca, N.Y. The experimental work was done by the first author at Cornell Univ. while he was on leave from I.V.I.C. Agronomy Paper no. 904.

² Visiting Scientist and Professor of Soil Science, respectively.

Received for publication February 16, 1970. Accepted for publication June 25, 1970.