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Structural Characterisation of Kaolinite:NaCl Intercalate and its Derivatives

Published online by Cambridge University Press:  28 February 2024

John G. Thompson ,
Philippa J. R. Uwins ,
Andrew K. Whittaker  and
Ian D. R. Mackinnon
John G. Thompson*
Affiliation:
Research School of Chemistry, Australian National University, GPO Box 4, Canberra, ACT 2601, Australia
Philippa J. R. Uwins
Affiliation:
Centre for Microscopy and Microanalysis, University of Queensland, QLD 4072, Australia
Andrew K. Whittaker
Affiliation:
Centre for Magnetic Resonance, University of Queensland, QLD 4072, Australia
Ian D. R. Mackinnon
Affiliation:
Centre for Microscopy and Microanalysis, University of Queensland, QLD 4072, Australia
*
4Author to whom correspondence should be addressed.
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Abstract

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Kaolinite:NaCl intercalates with basal layer dimensions of 0.95 and 1.25 nm have been prepared by direct reaction of saturated aqueous NaCl solution with well-crystallized source clay KGa-1. The intercalates and their thermal decomposition products have been studied by XRD, solid-state 23Na, 27Al, and 29Si MAS NMR, and FTIR. Intercalate yield is enhanced by dry grinding of kaolinite with NaCl prior to intercalation. The layered structure survives dehydroxylation of the kaolinite at 500°–600°C and persists to above 800°C with a resultant tetrahedral aluminosilicate framework. Excess NaCl can be readily removed by rinsing with water, producing an XRD “amorphous” material. Upon heating at 900°C this material converts to a well-crystallized framework aluminosilicate closely related to low-carnegieite, NaAlSiO4, some 350°C below its stability field. Reaction mechanisms are discussed and structural models proposed for each of these novel materials.

Keywords

FTIRIntercalateKaoliniteNaClNMRStructureSynthesisXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 4 , August 1992 , pp. 369 - 380
Copyright
Copyright © 1992, The Clay Minerals Society

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