Journal of Radioanalytical and Nuclear Chemistry

, Volume 241, Issue 3, pp 519–527 | Cite as

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
Article

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).

Keywords

Zeolite INAA Sorption Experiment Experimental Product Structural Micropore 

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Copyright information

© Akadémiai Kiadó 1999

Authors and Affiliations

  • J. Orechovska
    • 1
  • P. Misaelides
    • 2
  • A. Godelitsas
    • 2
  • P. Rajec
    • 1
  • H. Klewe-Nebenius
    • 3
  • F. Noli
    • 2
  • E. Pavlidou
    • 4
  1. 1.Department of Nuclear ChemistryComenius UniversityBratislavaSlovak Republic
  2. 2.Department of General & Inorganic ChemistryAristotle UniversityThessalonikiGreece
  3. 3.Institut für Instrumentelle Analytik, Forschungszentrum KarlsruheKarlsruheGermany
  4. 4.Department of Solid State PhysicsAristotle UniversityThessalonikiGreece

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