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Clays and Clay Minerals; February 2003; v. 51; no. 1; p. 33-40; DOI: 10.1346/CCMN.2003.510104
© 2003 Clay Minerals Society
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EXCHANGEABLE ION AND THERMAL TREATMENT EFFECTS ON BASAL SPACINGS OF Al-HYDROXY PILLARED MONTMORILLONITES

Aluísio Sousa Reis, Jr* and José Domingos Ardisson

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{at}urano.cdtn.br

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.

Key Words: Al-Hydroxy Intercalated Clays • ALHICS • Al2O3 Pillar • Basal Spacing • Cation Exchange Reaction • Homoionic Clays • Intercalated Clays • Montmorillonite • Pillared Clays • Surface Interactions • Thermal Stability






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