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

Lászlo Kotai, István E. Sajó, Emma Jakab, Gábor Keresztury, Éva Pfeifer, László Kocsis, Katalin Papp, István Gács, József Valyon, József Lippart

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Refluxing montmorillonite-containing raw bentonite ((Na, Ca)o. 33(Al, Mg)2Si4O10(OH)2) in aq HNO3, then neutralizing it with NH3 produces NH 4NO3-containing NH4-bentonite. The NH 4NO3 intercalated can be eliminated as a gaseous product (N2O and H2O) by heating at 400 °C, and the deammoniation and dehydroxylation process of the preactivated bentonite leads to formation of bleaching earth (Hx(Al, Mg)2-y, Si 4O10-(OH)2).

Original languageEnglish
Pages (from-to)1110-1111
Number of pages2
JournalChemistry Letters
Volume37
Issue number11
DOIs
Publication statusPublished - Dec 1 2008

ASJC Scopus subject areas

  • Chemistry(all)

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