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XRD profile modeling approach tools to investigate the effect of charge location on hydration behavior in the case of metal exchanged smectite

Published online by Cambridge University Press:  14 November 2013

Marwa Ammar ,
Walid Oueslati ,
Hafsia Ben Rhaiem  and
Abdesslem Ben Haj Amara
Marwa Ammar
Affiliation:
UR05/13-01: Physique des Matériaux Lamellaires et Nanomatériaux Hybrides (PMLNMH), Faculté des Sciences de Bizerte, Zarzouna 7021, Tunisia Tel.: +216 20 843 705; fax: +216 72 590 566.
Walid Oueslati*
Affiliation:
UR05/13-01: Physique des Matériaux Lamellaires et Nanomatériaux Hybrides (PMLNMH), Faculté des Sciences de Bizerte, Zarzouna 7021, Tunisia Tel.: +216 20 843 705; fax: +216 72 590 566.
Hafsia Ben Rhaiem
Affiliation:
UR05/13-01: Physique des Matériaux Lamellaires et Nanomatériaux Hybrides (PMLNMH), Faculté des Sciences de Bizerte, Zarzouna 7021, Tunisia Tel.: +216 20 843 705; fax: +216 72 590 566.
Abdesslem Ben Haj Amara
Affiliation:
UR05/13-01: Physique des Matériaux Lamellaires et Nanomatériaux Hybrides (PMLNMH), Faculté des Sciences de Bizerte, Zarzouna 7021, Tunisia Tel.: +216 20 843 705; fax: +216 72 590 566.
*
E-mail address: walidoueslati@ymail.com (W. Oueslati).
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Abstract

This work aims to investigate the hydration behavior and structural properties of two dioctahedral smectites with contrasting location charge (beidellite SbId-1 and montmorillonite SWy-2) according to the nature of the bivalent compensator heavy metal cations (i.e. Hg (II), Ni (II), Ba (II) and Mg (II)). This study is achieved using XRD profile modeling approach based on the simulation of the 00l reflection which allowed us to determine structural characteristics along the c* axis related to the nature, abundance, size, position and organization of exchangeable cation and water molecule in the interlamellar space along the c* axis. The obtained results show that a heterogeneous hydration behavior is systematically observed in all studied samples and the structural models, used to fit samples with tetrahedral charge, are more heterogeneous than smectite with an octahedral sheets substitution. In the case of exchanged beidellite specimen, the proposed models are described by a mixed layer structure with variable abundance containing respectively, dehydrated (0W), mono-hydrated (1W) and bihydrated (2W) layers. Whereas, in the case of the montmorillonite, the absence of 0W hydration state is noted.

Keywords

Charge locationheavy metal cationquantitative XRD analysishydration heterogeneities
Type
Technical Articles
Information
Powder Diffraction , Volume 28 , Supplement S2 , September 2013 , pp. S284 - S300
Copyright
Copyright © International Centre for Diffraction Data 2013 

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