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The water retention mechanism of a Cs+ and Na+ exchanged montmorillonite: effect of relative humidity and ionic radius on the interlayer

Published online by Cambridge University Press:  11 March 2015

Marwa Ammar ,
Walid Oueslati ,
Nejmeddine Chorfi  and
Abdesslem Ben Haj Amara
Marwa Ammar
Affiliation:
UR 05/13-01: Physique des Matériaux Lamellaires et Nanomatériaux Hybrides (PMLNMH), Faculté des Sciences de Bizerte, Zarzouna 7021, Tunisia
Walid Oueslati*
Affiliation:
UR 05/13-01: Physique des Matériaux Lamellaires et Nanomatériaux Hybrides (PMLNMH), Faculté des Sciences de Bizerte, Zarzouna 7021, Tunisia General Studies Department, College of Electronics and Communications, Technical and Vocational Training Corporation, TV Street, P.O. Box 2816, Jeddah 21461, Saudi Arabia
Nejmeddine Chorfi
Affiliation:
Department of Mathematics, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
Abdesslem Ben Haj Amara
Affiliation:
UR 05/13-01: Physique des Matériaux Lamellaires et Nanomatériaux Hybrides (PMLNMH), Faculté des Sciences de Bizerte, Zarzouna 7021, Tunisia
*
a) Author to whom correspondence should be addressed. Electronic mail: [email protected]
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Abstract

Dioctahedral smectites are clay minerals that widely used as a crucial component for the edifice of natural barriers in industrial wastes and wastewater treatment. The hydration behaviours of these mineral types are very sensitive by environmental surroundings changes. The present work focuses the evolution of the interlayer water amount as a function of the relative humidity rates (RH), varied along a humidifying-drying cycle, in the case of two dioctahedral smectites with different charge location (i.e. Wyoming montmorillonite SWy-2 and Beidellite SbId-1). The CEC (i.e. cation exchange capacity) of the studied sample is saturated by two monovalent cations (i.e., Cs+ and Na+) characterized by a different ionic radius. The X-ray diffraction (XRD) profile modelling tools based on the indirect method that consist on the comparison of experimental 00l reflections with other calculated from structural models is used to perform these aims. The qualitative XRD profile investigation suggests heterogeneous hydration behaviour at different stage of the cycle for all studied samples. The water content fluctuation, confirmed by the appearance of a hydration hysteresis, within the interlamellar space of diverse complexes is an irreversible process during the shrinking–rewetting sequence. Comparing to Na+ cations, the presence of the Cs+ ions in exchangeable sites of both smectite structures is accompanied by more orderliness of systems, which retunes the lowest water molecules amount over the applied cycle.

Keywords

dioctahedral smectitesXRD profile modellingshrinking–rewettingwater retention and hysteresis
Type
Technical Articles
Information
Powder Diffraction , Volume 30 , Supplement S1 , June 2015 , pp. S70 - S75
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Copyright
Copyright © International Centre for Diffraction Data 2015 

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