MODIFICACIÓN DE UNA BENTONITA SÓDICA MEDIANTE INTERCALACIÓN-PILARIZACIÓN Y DELAMINACIÓN CON OLIGÓMEROS DE Cr O Sn.

VANOY VILLAMIL MICHAEL NICOLÁS, J. G. CARRIAZO, R. MOLINA, S. MORENO

Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales

Academia Colombiana de Ciencias Exactas, Físicas y Naturales

Lugar: Bogota-Colombia; Año: 2010 vol. 34 p. 365 - 372

0370-3908

This work shows the modification of a natural clay type sodium Bentonite (from Valle del Cauca, Colombia) by pillaring and  delamination processes, following two different procedures of synthesis: traditional and assisted by microwaves; using polyhydroxocationic aqueous solutions of chromium(III) or tin(IV) as pillaring agents. The modified solids were characterized by X-ray diffraction (XRD), temperature programmed reduction (TPR) and X-ray fluorescence. The results indicate that the starting material was effectively modified by means of the intercalation of voluminous chromium or tin species (oligomers), obtaining delaminated solids in the last case. The TPR analyses reveal the presence of Cr(III) and Sn(IV) in the modified solids, verifying the effective incorporation of the required species.