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Effect of acid treatment on the structure of sepiolite

Published online by Cambridge University Press:  09 July 2018

A. Yebra-Rodríguez ,
J . D. Martín-Ramos ,
F. Del Rey ,
C. Viseras  and
A. López-Galindo
A. Yebra-Rodríguez*
Affiliation:
InstitutoAndaluz de Ciencias de la Tierra (CSIC-UGR), Campus Fuentenueva, 18071, Granada
J . D. Martín-Ramos
Affiliation:
Departamento de Mineralogía y Petrología, Campus Fuentenueva, 18071, Granada
F. Del Rey
Affiliation:
Departamento de Química Inorgánica, Campus Fuentenueva, 18071, Granada
C. Viseras
Affiliation:
Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidade de Granada, Spain
A. López-Galindo
Affiliation:
InstitutoAndaluz de Ciencias de la Tierra (CSIC-UGR), Campus Fuentenueva, 18071, Granada
*
*E-mail: alberto@ugr.es
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Abstract

An ab initio determination of the structure of sepiolite after acid treatment (HCl 0.5 N for 24 h) was carried out using X-ray powder diffraction data. After acid treatment, the sections normal to the a and c axes presented discontinuities, ∼2.25 Å wide, parallel to the (010) plane, with no electronic density maxima, thus suggesting that adjacent planes are joined by van der Waals-like residual links. Partial dissolution was detected on both octahedral and tetrahedral sheets, beginning by breaking the ribbons not along the edges, but in the centre, thus creating a 5.20 x 66.79 Å tunnel along the a axis. By interrupting the tetrahedral sheet, this mechanism changes the phyllosilicate-like nature of the sepiolite to an inosilicate-like structure.

Keywords

sepiolite structureacid treatmentX-ray powder diffraction
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 3 , September 2003 , pp. 353 - 360
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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