Large interlayer repeat distances observed for montmorillonites treated by mixed Al–Fe and Fe pillaring solutions

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T. Mandalia, M. Crespin, D. Messad and F. Bergaya


Abstract

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.


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