Ion exchange properties of natural titanium silicate caryochroite (Na,Sr)3{(Fe,Mg)2+10(OH)6[TiO(Si6O17)(OH)0.5]2}•8H2O with a 1D system of parallel wide channels: Experimental study and theoretical analysis of the topochemical mechanisms

Chukanov, N.V.; Aksenov, S.N.; Pekov, I.V.; Chervonnaya, N.A.; Varlamov, D.A.; Ermolaeva, V.N.; Britvin, S.N.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 10 февраля 2021 г.

Авторы: Chukanov N.V., Aksenov S.N., Pekov I.V., Chervonnaya N.A., Varlamov D.A., Ermolaeva V.N., Britvin S.N.
Журнал: Microporous and Mesoporous Materials
Том: 312
Год издания: 2021
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 110776
DOI: 10.1016/j.micromeso.2020.110776
Аннотация: Ion-exchange properties of natural caryochroite (Na,Sr)3{(Fe,Mg)2+10(OH)6[TiO(Si6O17)(OH)0.5]2}·8H2O, a microporous heterophyllosilicate with a one-dimensional system of broad zeolytic channels, related to nafertisite Na3{Fe2+10(OH)6[TiO(Si6O17)F0.5]2}·2H2O, were studied in reactions with 1 N aqueous solutions of Rb, Cs, Ag, and Pb nitrates at 50 °C. In reactions with Rb+, Cs+, and Pb2+, sodium is partly replaced by nearly equivalent amounts of larger cations. In reactions with Pb2+ and Ag+, additional processes involving H2O molecules take place: replacement of two H2O molecules with Pb2+ + 2OH− and replacement of H2O molecule with Ag+ + OH−. The geometrical-topological analysis of ion migration pathways in the nafertisite-type structures carried out using an approach based on the Voronoi-Dirichlet partition has shown that only Na+ cations occurring at the centers of wide channels can take part in reactions with large alkaline cations proceeding in counter flows. In the reaction with Ag+, additional Na+ ions are involved. Li+ cations having a smaller radius can pass through the window between the channels, forming a 2D conducting layer.
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Ion exchange properties of natural titanium silicate caryochroite (Na,Sr)3{(Fe,Mg)2+10(OH)6[TiO(Si6O17)(OH)0.5]2}•8H2O with a 1D system of parallel wide channels: Experimental study and theoretical analysis of the topochemical mechanismsстатья Исследовательская статья

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