Abstract
It was shown that the interaction of silver cations in alkaline aqueous solutions with various kinds of silicates, regardless of their chemical and aggregation state, leads to the formation of an exclusively disilicate form of silver salt. We develop procedures for synthesis of nanostructured weakly ordered nonstoichiometric silver disilicate Ag6 –xHxSi2O7 capable of forming aqueous colloids. We study the micellular structure of colloidal particles in these solutions and demonstrate that permeability of silicic acid layers enveloping nanosized salt cores of these micelles depends on pH. Colloidal silver disilicate is found to exhibit a high catalytic activity in photoinduced oxidation of a broad spectrum of different compounds, which is demonstrated for compounds stable in aqueous solutions such as some organic dies and ferrocyanide complex ([Fe(CN\()_{6}^{{ - 4}}\)).
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ACKNOWLEDGMENTS
We are grateful to S.I. Pavlov for assistance in scanning electron microscopy imaging and to M. A. Yagovkin for assistance in X-ray pattern analysis.
Experimental measurements were carried out using facilities of the Joint Research Center “Material Science and Characterization in Advanced Technology” (Ioffe Institute, St. Petersburg, Russia).
Funding
The work was supported by the Ministry of Education and Science of the Russian Federation (agreement no. 14.621.21.0013 dated August 28, 2017, project ID RFMEFI62117X0018).
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Translated by A. Kukharuk
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Baidakova, M.V., Germanov, N.A., Golyandin, S.N. et al. Weakly Ordered Nanostructured Silver Disilicate and Its Colloidal Solutions: Preparation and Properties. Tech. Phys. 64, 884–892 (2019). https://doi.org/10.1134/S1063784219060033
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DOI: https://doi.org/10.1134/S1063784219060033