doi: 10.17586/2226-1494-2022-22-3-509-516

Photocatalytic properties of Ag-AgBr nanostructures in ion-exchanged layers of bromide sodium-zinc-aluminosilicate glass matrix

D. V. Marasanov, E. M. Sgibnev, N. V. Nikonorov

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Marasanov D.V., Sgibnev Y.M., Nikonorov N.V. Photocatalytic properties of Ag–AgBr nanostructures in ion-exchanged layers of bromide sodium-zinc-aluminosilicate glass matrix. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2022, vol. 22, no. 3, pp. 509–516. (in Russian). doi: 10.17586/2226-1494-2022-22-3-509-516

The photocatalytic properties of Ag–AgBr nanostructures formed by low-temperature ion exchange method and followed heat-treatment in bromide sodium-zinc-aluminosilicate glass have been investigated.  Glasses based on Na2O–ZnO–Al2O3–SiO2 system and doped with Sb2O3, Ce2О3 and Br were synthesized. Layers containing silver ions were formed on the surface of sodium-zinc-aluminosilicate glass by the ion exchange method. The glass samples were immersed in a bath containing a melt of nitrate mixture 5AgNO3/95NaNO3 (mol%) at 320 °C for 2 hours. Subsequent heat treatment at 500 °C resulted in a formation of Ag–AgBr nanostructures in the surface layer. The photocatalytic properties of the Ag–AgBr nanostructures on the glass surface were measured by the decomposition of the methyl orange dye. A comprehensive study of the spectral and photocatalytic properties of Ag–AgBr nanostructures has been carried out. It was shown that, after ion exchange and heat treatment, the AgBr crystal shells with a size of 6 nm were formed around silver nanoparticles. It has been established that the presence of a photocatalyst with Ag–AgBr nanostructures in the surface layer of glass under ultraviolet irradiation leads to degradation of the methyl orange dye by 77 %. Reducing the thickness of the ion-exchange layer to 5 μm by chemical etching decreased the degradation efficiency of the methyl orange dye to 15 %. The results of the work can be applied in devices for the photocatalytic decomposition of water to produce hydrogen.

Keywords: ion exchange, bromide sodium-zinc-aluminosilicate glass, silver nanoparticles, AgBr nanocrystals, photocatalysis, methyl orange dye

Acknowledgements. The work was supported by the Russian Science Foundation (project no. 20-19-00559). The authors thank engineer Kuzmenko N.K. in ITMO University for X-ray phase analysis.

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