Raw montmorillonites treated with mixed Al–Fe pillaring solutions, with Fe/(Al + Fe) molar ratio between 0.1 and 1, and heated at 300 °C lead to large d-spacings according to XRD which increase from 52 Å for the sample with the lowest iron content to 76 Å for the pure Fe-treated clay sample.
T. Mandalia, M. Crespin, D. Messad and F. Bergaya, Chem. Commun., 1998, 2111 DOI: 10.1039/A803746I
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