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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

References

Adams, C. R. and Vogue, H. H. (1957) Aging of silica-alumina cracking catalyst. II Electron microscope studies: J. Phys. Chem., v. 61, pp. 722–727.CrossRefGoogle Scholar
Brunauer, S., Emmett, P. H. and Teller, E. (1938) Adsorption of gases in multimolecular layers: J. Amer. Chem. Soc., v. 60, p. 309.CrossRefGoogle Scholar
Davis, R. T. and DeWitt, T. W. (1948) The adsorption of butane on glass spheres: J. Amer. Chem. Soc., v. 70, pp. 1135–1141.CrossRefGoogle Scholar
Dyal, R. S. and Hendricks, S. B. (1950) Total surface of clays in polar liquids as a characteristic index: Soil Sci., v. 69, pp. 421–432.CrossRefGoogle Scholar
Escard, J. (1950) Influence de la deshydration progressive sur l'aire de surface de mont- morillonites: J. Chim. Phys., v. 47, no. 1-2, pp. 113–117.CrossRefGoogle Scholar
Gutierrez-Rios, E. and Lopez-Gonzalez, J. de D. (1952) Accion de los acidos fuertes sobre los silicatos de la serie isomorfa montmoriłlonitar-beidellita: Anal. Edaf., v. 11, p. 225; ibid., pp. 527-538.Google Scholar
Hoyos de Castro, A., Gonzalez-Garcia, F. and Martin-Vivaldi, J. L. (1950) Anal. Real Soc. Esp. Fis. Quim., v. 46 (B), p. 715.Google Scholar
Lopez-Gonzalez, J. de D. and Deitz, V. R. (1952) Surface changes in an original and activated bentonite: J. Res. Natl. Bur. Stand., v. 48, pp. 325–333.Google Scholar
Lopez-Gonzalez, J. de D. and Gonzalez-Garcia, S. (1954) Modifications en la superficie total y externa de una bentonita por activacion acida: Anal. Real Soc. Esp. Fis. Quirn., v. 50 (B), pp. 465–470.Google Scholar
Mills, G. A., Holmes, J. and Cornelius, E. B. (1950) Acid activation of some bentonite clays: J. Phys. Colloid Chem., v. 54, pp. 1170–1185.CrossRefGoogle ScholarPubMed
Nutting, P. G. (1935) Technical basis of bleaching-clay industry: Amer. Assoc. Petroleum Geologists Bull., v. 19, pp. 1043–1052.Google Scholar
Schlaffer, W. G., Morgan, C. Z. and Wilson, J. N. (1957) Aging of silicas-alumina cracking catalyst. I Kinetics of structural changes by heat and steam: J. Phys. Chem., v. 61, pp. 714–722.CrossRefGoogle Scholar
Travers, A. (1933) Sur l'activation dos terres: Douzieme Congrès de Chemie Industrielle, Chim. Ind., p. 794.Google Scholar
Walker, G. F. (1951) Vermiculites and some related mixed-layer minerals: in X-Ray Identification and, Crystal Structures of Clay Minerals, Mineralogical Society, London, pp. 199–223.Google Scholar