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Acid activation of a Spanish sepiolite: physico-chemical characterization, free silica content and surface area of products obtained

Published online by Cambridge University Press:  09 July 2018

M. A. Vicente Rodriguez ,
J. DE D. Lopez Gonzalez  and
M. A. Bañares Muñoz
M. A. Vicente Rodriguez
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias, Universidad Nacional de Educación a Distancia, Senda del Rey s/n, 28040 Madrid, Spain Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad de Salamanca, Plaza de los Caídos s/n, 37008 Salamanca, Spain
J. DE D. Lopez Gonzalez
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias, Universidad Nacional de Educación a Distancia, Senda del Rey s/n, 28040 Madrid, Spain
M. A. Bañares Muñoz
Affiliation:
Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad de Salamanca, Plaza de los Caídos s/n, 37008 Salamanca, Spain
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Abstract

A sepiolite from Vallecas (Spain) was treated with solutions of HC1 (1.25, 2.5, 5.0, 10.0 and 20.0 wt%) at 25°C for 2, 6, 24 and 48 h, respectively. The resulting solids were characterized by XRD, FT-IR and thermal analyses, along with SEM, TEM and nitrogen adsorption isotherms at 77 K. The free silica was digested and determined in all samples. Several samples were seen to have specific surface areas up to 450 m2/g, with a maximum value of 549 m2/g in the sample treated with 1.25 wt% HCl for 48 h. A sudden decrease in specific surface areas was observed when free silica was digested.

Type
Research Article
Information
Clay Minerals , Volume 29 , Issue 3 , September 1994 , pp. 361 - 367
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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