Kinetics of Sr2+ sorption on clinoptilolite-containing tuffs of different deposits from the surface drinking water

Tatyana G. Kuzmina; Valentina A. Nikashina; Nadezhda Lichareva; Irina N. Gromjak; Inna B. Serova; Ognyan Petrov

doi:10.17308/sorpchrom.2017.17/449

Tatyana G. Kuzmina Senior Researcher, PhD (Phys.-Math.), Сentral laboratory of substances analysis, Vernadsky Institute of Geochemistry and Analytical Chemistry RAN, Moscow
Valentina A. Nikashina Senior Researcher, PhD (Chemistry), the sorption methods laboratory, Vernadsky Institute of Geochemistry and Analytical Chemistry RAN, Moscow; e-mail: nikashina_v@mail.ru; nikashina@geokhi.ru;
Nadezhda Lichareva Researcher, Institute of Mineralogy and Crystallography, BAS, Bulgaria,1113 Sofia
Irina N. Gromjak Junior researcher, Сentral laboratory of substances analysis, Vernadsky Institute of Geochemistry and Analytical Chemistry RAN, Moscow
Inna B. Serova Researcher, the sorption methods laboratory, Vernadsky Institute of Geochemistry and Analytical Chemistry RAN, Moscow
Ognyan Petrov PhD (Geochemistry), Head of laboratory Institute of Mineralogy and Crystallography, BAS, Bulgaria,1113 Sofia

DOI: https://doi.org/10.17308/sorpchrom.2017.17/449

Keywords: the clinoptilolite-containing tuff, Sr2 ion-exchange, kinetics, the surface drinking water, the mathematical model, permeable reactive barrier

Abstract

Previously Sr²⁺ion-exchange isotherms were obtained from the surface drinking water and the corresponding Sr²⁺ distribution coefficients (Kd) were calculated for linear part of the isotherms of the studied CLT. The comparative kinetic data of Sr²⁺ ion-exchange sorption on NH₄⁺- forms of the clinoptilolite-containing tuffs from deposits of Russia and Bulgaria on the sample of the surface drinking water was investigated in detail with the known method of the "thin layer". It was shown, that the kinetic process of the Sr-sorption on the clinoptilolite- containing tuffs is characterized with the features and includes 3 stages. The first stage is described with the particle diffusion law, the second stage –a slowing down, the ion-exchange process reaches a plateau, then an increase of Sr²⁺ sorption is observed again. The particle diffusion coefficients of Sr²⁺ describing the first stage of the sorption process on CLT of different deposits were calculated. The obtained data are the initial one for the development of a mathematical model of the dynamic ion-exchange process on NH₄⁺-form of the clinoptilolite- containing tuffs from the surface drinking waters, that makes possible to generate the computer program and thereupon to calculate the break-through curves of Sr²⁺ sorption on NH₄⁺- clinoptilolite- containing tuffs for the different dynamic conditions, including the sorption dynamic conditions on the permeable reactive barrier

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