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