Chemical stability of aluminium–iron- and iron-pillared montmorillonite: extraction and reduction of iron
Abstract
A substantial amount of iron(III) from Al/Fe- and Fe-pillars is (i) extracted by hydrochloric acid, ammonium oxalate at pH 3 and dithionite and (ii) reduced to FeII by hydrazine vapour or liquid or dithionite, while only trace extraction and reduction was found for dithionite–citrate–bicarbonate (DCB).