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Acid Activation of a Ferrous Saponite (Griffithite): Physico-Chemical Characterization and Surface Area of the Products Obtained

Published online by Cambridge University Press:  28 February 2024

M. A. Vicente Rodriguez ,
M. Suarez Barrios ,
J. D. Lopez Gonzalez  and
M. A. Bañares Muñoz
M. A. Vicente Rodriguez
Affiliation:
Departamento de Química Inorganica, Facultad de Ciencias, Universidad Nacional de Educatión a Distancia, Senda del Rey, s/n., E-28040-Madrid, (Spain) Departamento de Química Inorgánica, Facultad de Química, Universidad de Salamanca, Plaza de la Merced, s/n., E-37008-Salamanca, (Spain)
M. Suarez Barrios
Affiliation:
Area de Mineralogía y Cristalografia, Departamento de Geología, Facultad de Ciencias, Universidad de Salamanca, Plaza de la Merced, s/n., E-37008-Salamanca, (Spain)
J. D. Lopez Gonzalez
Affiliation:
Departamento de Química Inorganica, Facultad de Ciencias, Universidad Nacional de Educatión a Distancia, Senda del Rey, s/n., E-28040-Madrid, (Spain)
M. A. Bañares Muñoz
Affiliation:
Departamento de Química Inorgánica, Facultad de Química, Universidad de Salamanca, Plaza de la Merced, s/n., E-37008-Salamanca, (Spain)
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Abstract

A ferrous saponite (griffithite) from Griffith Park (California, USA) was treated with solutions of HCl (0.62, 1.25 and 2.5% by weight) at 25°C for 2, 6, 24 and 48 hours. The resulting solids were characterized by XRD, FT-IR spectroscopy, thermal analyses, SEM, TEM and nitrogen adsorption isotherms at 77 K, showing the destruction of silicate structure by the treatments. The free silica generated by these treatments was digested and determined in all samples. Several samples had specific surface areas up to 250 m2/g, with maximum values which are 10 times higher than the surface area of natural saponite (35 m2/g). A sudden decrease in specific surface areas was observed when free silica was digested, which indicates that free silica makes a very important contribution to the surface area of leached samples.

Keywords

Acid activationFerrous saponiteFree silicaSurface area
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 6 , December 1994 , pp. 724 - 730
Copyright
Copyright © 1994, Clay Minerals Society

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