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Clays and Clay Minerals; June 2004; v. 52; no. 3; p. 334-340; DOI: 10.1346/CCMN.2004.0520308
© 2004 Clay Minerals Society
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ADSORPTION OF POLY(VINYL ALCOHOL) ON MONTMORILLONITE

Silvia G. de Bussetti1,* and Eladio A. Ferreiro1,2

1 Departamento de Agronomía, Universidad Nacional del Sur, B8000 Bahía Blanca, Argentina
2 Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)

* E-mail address of corresponding author: sgbusset{at}uns.edu.ar

The adsorption of poly(vinyl alcohol) (PVA) on montmorillonites saturated with calcium (Ca-Mt) and sodium (Na-Mt) as a function of the pH value and PVA concentration in aqueous solution was studied. Owing to the binding effect of the bivalent cation, the adsorption of PVA on Ca-Mt decreases as the pH of the suspension increases, whereas adsorption on Na-Mt is unaffected by the suspension pH. The adsorption maximum of PVA (pH 6) on Ca-Mt was 151.2 mg of PVA g–1 of clay, which is considerably lower than that on Na-Mt (496.2 mg g–1). These adsorption data coincide with the basal spacings obtained for the clays: 1.72 and 2.26 nm for Ca-Mt and Na-Mt, respectively. Sodium permits a greater separation between the clay laminae than calcium, but in both clays the presence of the polymer gives rise to a material in which PVA is intercalated between the laminae and is also adsorbed on the external surface. Adsorption is a slow process and is irreversible in both clays.

Key Words: Adsorption • Montmorillonite • pH • Poly(vinyl alcohol)






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