Investigation of HEU-type zeolite crystals after interaction with Sr2+ cations in aqueous solution using nuclear and surface analytical techniques

J. Orechovska; P. Misaelides; A. Godelitsas; P. Rajec; H. Klewe-Nebenius; F. Noli; E. Pavlidou

doi:10.1007/bf02347207

Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 241: Issue 3

Investigation of HEU-type zeolite crystals after interaction with Sr²⁺ cations in aqueous solution using nuclear and surface analytical techniques

Authors:

J. Orechovska

J. Orechovska Comenius University Department of Nuclear Chemistry SK-84215 Bratislava Slovak Republic

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P. Misaelides

P. Misaelides Aristotle University Department of General & Inorganic Chemistry GR-54006 Thessaloniki Greece

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A. Godelitsas

A. Godelitsas Aristotle University Department of General & Inorganic Chemistry GR-54006 Thessaloniki Greece

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P. Rajec

P. Rajec Comenius University Department of Nuclear Chemistry SK-84215 Bratislava Slovak Republic

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H. Klewe-Nebenius

H. Klewe-Nebenius Institut für Instrumentelle Analytik, Forschungszentrum Karlsruhe P.O. Box 3640 D-76021 Karlsruhe Germany

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F. Noli

F. Noli Aristotle University Department of General & Inorganic Chemistry GR-54006 Thessaloniki Greece

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E. Pavlidou

E. Pavlidou Aristotle University Department of Solid State Physics GR-54006 Thessaloniki Greece

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Pages:: 519–527

Online Publication Date:: 10 Apr 2006

Publication Date:: 17 Sep 1999

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02347207

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Abstract

Pure HEU-type zeolite (heulandite) crystals were allowed to interact with Sr²⁺ cations in aqueous solution. The powdered solid experimental products obtained from batch-type sorption experiments, using solutions of Sr²⁺-concentrations between 10 and 1000 mg/l, were investigated using INAA, RI-XRF and SEM-EDS. The Sr uptake by the mineral which can adequately be described with a Freundlich-type isotherm, varies from 3.14 to 6.22 mg/g. The distribution coefficients increase progressively by decreasing the solutions concentration reaching a value of 1800 ml/g. The investigated zeolite interacts with Sr²⁺ cations through ion exchange reactions and initial exchangeable Ca²⁺ cations are replaced into the structural micropores. However, in the best case, only ca. 43% of the theoretical CEC can be covered because of the limited availability of the extra framework Ca²⁺ cations that can be removed from the lattice under ambient treatment conditions. The XPS investigation of Sr-loaded single crystals indicated that adsorption of Sr²⁺ cations on the outer surface also occurs while surface precipitation phenomena must be excluded. Similar surface analyses by means of¹²C-RBS showed that the Sr depth-distribution at near-surface layers is quite homogenous in contrast to a previous relevant study revealing an intense surface Sr-accumulation on a natural Ca-zeolite of different structural characteristics (scolecite).

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)