Abstract

HERNANDEZ, Willinton Y; MORENO, Sonia  and  MOLINA, Rafael A. MODIFICATION AND CHARACTERIZATION OF A COLOMBIAN VERMICULITE WITH TITANIUM, ZIRCONIUM AND SULFAT. Rev.Colomb.Quim. [online]. 2007, vol.36, n.1, pp. 73-91. ISSN 0120-2804.

The present work reports the results of chemical, structural and textural characterization of a Colombian vermiculite modified with simple species of Zr and Ti, and the mixed system of Ti-Zr in nominal atomic relations Zr/(Ti + Zr) = 0,1 and 0,5. Additionally, the incidence of sulfate presence was evaluated under the nominal relations sulfate/metal 0; 0,25 and 0,35, incorporating sulfate either in the intercalation solution, or by impregnation on modified and calcined solids. The results indicate that when the sulfation is carried out by intercalation, the chemical nature of the intercalation solution affects the amount of incorporated metal, depending on the relation used sulfate/metal. When the sulfation by impregnating is carried out, the textural, structural and morphologic properties of the obtained solids are strongly affected and are accompanied of a sulfur fixation significantly greater than for solids sulfated by intercalation.

Keywords : Vermiculite; sulfate/metal; sulfation by intercalation; sulfation by impregnation.