Ion exchange of Cs+ and Sr2+ by natural clinoptilolite from bi-cationic solutions and XRD control of their structural positioning

Clinoptilolite from Bulgaria was tested for uptake towards Cs + and Sr 2+ from bi-cationic solutions using batch technique. Contact time and cation concentrations were investigated, revealing minor difference in Cs + sorption from single and mixed solutions but clear difference in Sr 2+ uptake. Kine...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2020-03, Vol.323 (3), p.1093-1102
Main Authors: Lihareva, N., Petrov, O., Dimowa, L., Tzvetanova, Y., Piroeva, I., Ublekov, F., Nikolov, A.
Format: Article
Language:English
Subjects:
Cations
Cesium ions
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Hadrons
Heavy Ions
Inorganic Chemistry
Ion exchange
Nuclear Chemistry
Nuclear Physics
Physical Chemistry
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Summary:Clinoptilolite from Bulgaria was tested for uptake towards Cs + and Sr 2+ from bi-cationic solutions using batch technique. Contact time and cation concentrations were investigated, revealing minor difference in Cs + sorption from single and mixed solutions but clear difference in Sr 2+ uptake. Kinetic data were fit with pseudo-second-order kinetic model. The Langmuir isotherm model provided best description of equilibrium ion-exchange data [ q max (mg/g) is 122.7 for Cs + and 21.50 for Sr 2+ ]. Desorption experiments show that cesium and strontium ions are retained strongly by clinoptilolite. Rietveld structure refinement showed that approximately four Cs + ions were exchanged versus one Sr 2+ ion in clinoptilolite.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-020-07018-7