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Physicochemical and structural characteristics of HEU-type zeolitic tuff treated by hydrochloric acid

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Author(s): ANA RADOSAVLJEVIC-MIHAJLOVIC | VERA DONDUR | ALEKSANDRA DAKOVIC | JOVAN LEMIC | MAGDALENA TOMASEVIC-CANOVIC

Journal: Journal of the Serbian Chemical Society
ISSN 0352-5139

Volume: 69;
Issue: 4;
Start page: 273;
Date: 2004;
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Keywords: HEU-type zeolite | acid modification | X-ray analysis | Novakovici

ABSTRACT
Samples of natural HEU-type zeolites – clinoptilolite-Ca, from the Novakovici deposit (near Prijedor, Bosnia and Herzegovina) were treated with the hydrochloric acid of various concentrations (from 10-3 M to 2 M). Zeolitic tuffs before and after the acid treatment were examined using IR, XRPD, and chemical analyses. The changes in the crystal structure of acid treated samples showed a significant reduction in the crystallinity of zeolitic tuffs (60–70 %), which were effected by hydrochloric acid with concentrations of 1 M and above.
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