INVESTIGADORES
CYRAS Viviana Paola
artículos
Título:
Modification of Bentonite by Combination of Reactions of Acid-Activation, Silylation and Ionic Exchange
Autor/es:
DAVID A. DAMICO; ROMINA P. OLLIER; VERA A. ALVAREZ; WALTER F. SCHROEDER ; VIVIANA P. CYRAS
Revista:
APPLIED CLAY SCIENCE
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: New York; Año: 2014 vol. 99 p. 254 - 260
ISSN:
0169-1317
Resumen:
The aim of this study is to
analyze different strategies of modification of bentonite (Bent) combining
reactions of cationic exchange, silylation and acid activation. Six samples of
modified bentonite were prepared: silylated
bentonite (S-Bent), acid-activated bentonite (A-Bent), exchanged clay (E-Bent), silylated and acid-activated clay (S-A-Bent),
exchanged and acid-activated clay (E-A-Bent), and exchanged, silylated and acid-activated bentonite (E-S-A-Bent). To study the effectiveness of the
different treatments, X-rays
diffraction analysis, thermogravimetric
analysis, Fourier transform infrared spectroscopy and water absorption tests were performed. After silylation
reaction, the modified clay presented an increase in the basal spacing as well
as a significant reduction in the equilibrium water uptake percentage. The results were markedly improved when the silylated
and acid-activated bentonite was further modified by cationic exchange
reaction.