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Exchangeable Ion and Thermal Treatment Effects on Basal Spacings of Al-Hydroxy Pillared Montmorillonites

Published online by Cambridge University Press:  01 January 2024

Aluísio Sousa Reis Jr.  and
José Domingos Ardisson
Aluísio Sousa Reis Jr.*
Affiliation:
Centro de Desenvolvimento de Tecnologia Nuclear (CDTN), Rua Prof. Mário Werneck, S/N°, Campus da UFMG, Cidade Universitária-Pampulha, Belo Horizonte — MG, Brazil
José Domingos Ardisson
Affiliation:
Centro de Desenvolvimento de Tecnologia Nuclear (CDTN), Rua Prof. Mário Werneck, S/N°, Campus da UFMG, Cidade Universitária-Pampulha, Belo Horizonte — MG, Brazil
*
*E-mail address of corresponding author: reisas@urano.cdtn.br
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Abstract

Al-hydroxy intercalated clays (ALHICs) obtained from different parent clays were used to investigate the interactions between oligomers and clay surface layers.

The thermal stability of ALHICs obtained from natural, Cs-, Ca-, Ba-, Fe-, Cu- or Ce-montmorillonites has been investigated by studying the relationship between basal spacing and calcination temperature. X-ray diffraction has shown that the basal spacing of ALHICs obtained from Cu-montmorillonite calcined at 550°C is 13.4 Å, different from basal spacings of ALHICs obtained from Fe-montmorillonite (16.0 Å) and other parent clays (16.7 Å). Thermograms for AlHICs obtained from natural, Fe- and Ce-montmorillonites displayed distinct steps at 225 and 650°C, attributed to the dehydration of Al13 oligomers, and the dehydroxylation of the surface layer, respectively. By contrast, thermograms of ALHICs obtained from Cu-montmorillonite displayed one step between 250 and 700°C for both dehydration and dehydroxylation. Mössbauer parameters showed that Fe3+ octahedra in octahedral sheets are distorted in pillared interlayered clay (PILC) obtained from Cu-montmorillonite and undistorted in that obtained from Fe-montmorillonite. The difference in thermal stability for the various ALHICs is attributed to the retention of some of the original cations after intercalation with Al13 oligomers, which induces several interactions between the oligomers and the clay surface layers.

Keywords

Al-Hydroxy Intercalated ClaysALHICSAl2O3 PillarBasal SpacingCation Exchange ReactionHomoionic ClaysIntercalated ClaysMontmorillonitePillared ClaysSurface InteractionsThermal Stability
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 1 , February 2003 , pp. 33 - 40
Copyright
Copyright © 2003, The Clay Minerals Society

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