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Showing papers by "Emma Jakab published in 2008"

Journal Article•DOI•
A convenient procedure for the acidic activation of mineral bentonite: An environmentally friendly method for the preparation of bleaching earths

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László Kótai1, István E. Sajó1, Emma Jakab1, Gábor Keresztury1, Éva Pfeifer1, László Kocsis1, Katalin Papp1, István Gács1, József Valyon1, József Lippart1 •
Hungarian Academy of Sciences1
27 Sep 2008-Chemistry Letters
TL;DR: RefRefluxing montmorillonite-containing raw bentonite ((Na,Ca)o.33(Al,Mg)2Si 4 O 10 (OH) 2 ) in aq HNO 3, then neutralizing it with NH 3 produces NH 4 NO 3 -containing NH 4 -bentonite.
Abstract: Refluxing montmorillonite-containing raw bentonite ((Na,Ca)o.33(Al,Mg)2Si 4 O 10 (OH) 2 ) in aq HNO 3 , then neutralizing it with NH 3 produces NH 4 NO 3 -containing NH 4 -bentonite. The NH 4 NO 3 intercalated can be eliminated as a gaseous product (N 2 O and H 2 O) by heating at 400 °C, and the deammoniation and dehydroxylation process of the preactivated bentonite leads to formation of bleaching earth (H x (Al,Mg) 2 -ySi 4 O 10 -(OH) 2 ).