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Clay Minerals; September 2003; v. 38; no. 3; p. 353-360; DOI: 10.1180/0009855033830101
© 2003 Mineralogical Society of Great Britain and Ireland
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Research Paper

Effect of acid treatment on the structure of sepiolite

A. YEBRA-RODRÍGUEZ1, J. D. MARTÍN-RAMOS2, F. del REY3, C. VISERAS4 and A. LÓPEZ-GALINDO1,*

1 Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Campus Fuentenueva, 18071 Granada, 2 Departamento de Mineralogía y Petrología, Campus Fuentenueva, 18071 Granada, 3 Departamento de Química Inorgánica, Campus Fuentenueva, 18071 Granada, and 4 Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidade de Granada, Spain

* E-mail: alberto{at}ugr.es

(Received 17 December 2001; revised 7 January 2003)

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 5.20x6.79 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 structure, acid treatment, X-ray powder diffraction




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 Clays and Clay MineralsHome page
M. Ozdemir and I. Kipcak
DISSOLUTION KINETICS OF SEPIOLITE IN HYDROCHLORIC ACID AND NITRIC ACID
Clays and Clay Minerals, December 1, 2004; 52(6): 714 - 720.
[Abstract] [Full Text] [PDF]


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