Study of the kinetics and mechanism of Sr.sup.2+ sorption by clinoptilolite

The parameters of kinetics of Sr.sup.2+ sorption by natural clinoptilolite were investigated. The overall rate constants were determined by application of pseudo-first and pseudo-second order kinetic models. The actual sorption mechanism was studied by application of both intraparticle and surface f...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2019-07, Vol.321 (1), p.31
Main Authors: Lihareva, N, Dimowa, L, Petrov, O, Tzvetanova, Y, Atanasova-Vladimirova, S
Format: Article
Language:English
Subjects:
Analysis
Radioactive wastes
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Summary:The parameters of kinetics of Sr.sup.2+ sorption by natural clinoptilolite were investigated. The overall rate constants were determined by application of pseudo-first and pseudo-second order kinetic models. The actual sorption mechanism was studied by application of both intraparticle and surface film diffusion models. The application of Rietveld structure refinement shows the preferable sites of strontium ion exchange in the clinoptilolite structure and their diffusion through cationic sites with time, as well as indicates the positions occupied by Sr.sup.2+ ions at the start of the exchange process and the positions where Sr.sup.2+ accumulates in subsequent ion exchange stages.
ISSN:0236-5731
DOI:10.1007/s10967-019-06574-x