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Surface Area Changes of a Vermiculite by Acid and Thermal Treatment

Published online by Cambridge University Press:  01 January 2024

Juan de D. Lopez-Gonzalez  and
Jesus Cano-Ruiz
Juan de D. Lopez-Gonzalez*
Affiliation:
Laboratorios de Quimica Inorganica de la Universidad de Granada y Estacion, Experimental del Zaidin, Granada, Spain
Jesus Cano-Ruiz
Affiliation:
Laboratorios de Quimica Inorganica de la Universidad de Granada y Estacion, Experimental del Zaidin, Granada, Spain
*
1Present address: Department of Soils and Plant Nutrition, University of California at Berkeley.
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Abstract

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A Vermiculite from Beni-Uxera, North Africa, was refluxed with HC1 solutions of various concentrations to determine the effect of such a treatment on its surface area. The treated vermiculite was analyzed for “free” SiO2 and by x-ray diffraction, and the refluxing solutions were analyzed for the cations removed from the vermiculite. Surface areas were determined by means of adsorption isotherms of n-butane at 0°C.

The surface area of the acid-treated vermiculite increases with increase in concentration of the acid. Heating of the acid-treated samples or the natural samples decreases the surface area.

The increase in surface area by acid treatment is due to destruction of the vermiculite and its conversion to a “free” form of SiO2 which possesses a large surface area. x-Ray analysis indicated that this “free” SiO2 was not present in the interlayer positions of the crystal lattice of vermiculite.

Type
Article
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 6 , February 1957 , pp. 399 - 405
Copyright
Copyright © Clay Minerals Society 1957

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