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This article is cited in 1 scientific paper (total in 1 paper)
CHEMISTRY AND MATERIAL SCIENCE
Synthesis and comparative photocatalytic activity of CuO layers on SiO$_{2}$ substrates
E. V. Polyakov, R. R. Tzukanov, I. V. Volkov, L. Yu. Buldakova, I. V. Baklanova, O. A. Lipina, V. P. Zhukov, Yu. V. Kuznetsova, A. P. Tutyunnik, M. A. Maximova Institute of Solid State Chemistry UB RAS, 91, Pervomaiskaya str.,
Ekaterinburg, 620990, Russian Federation
Abstract:
Using the thermodynamic and kinetic approaches, it was found that Cu(NH$_{3}$)$^{2+}_{4 aq}$ complex predominating at 23$^{\circ}$C spontaneously decomposes at elevated temperatures, forming CuO precipitate in a bulk solution and a layer (CuO||SiO$_{2}$) on the surface of silica glass. The rates of these heterogeneous processes are fairly well described by the 1st-order reaction of decay of the Cu(NH$_{3}$)$^{2+}_{4 aq}$ complex. The formation of the CuO precipitate and layer is a two-step kinetic process. The rate of precipitate formation dominates above 65$^{\circ}$C while the rate of the layer formation prevails below this value. The CuO$\parallel$SiO$_{2}$ material synthesized below 65 possesses an optical bandgap of (1.25 0.05) eV, which is smaller compared to the crystals of commercial CuO. The CuO||SiO$_{2}$ material displays a photocatalytic activity in the reaction of UV-decomposition of benzoquinone-hydroquinone. It was discovered that the photocatalytic activity depends on the thickness of the photocatalyst layer.
Keywords:
Copper(II), oxide, layer, glass, surface, kinetics, photocatalyst.
Received: 18.09.2020
Citation:
E. V. Polyakov, R. R. Tzukanov, I. V. Volkov, L. Yu. Buldakova, I. V. Baklanova, O. A. Lipina, V. P. Zhukov, Yu. V. Kuznetsova, A. P. Tutyunnik, M. A. Maximova, “Synthesis and comparative photocatalytic activity of CuO layers on SiO$_{2}$ substrates”, Nanosystems: Physics, Chemistry, Mathematics, 11:5 (2020), 601–607
Linking options:
https://www.mathnet.ru/eng/nano563 https://www.mathnet.ru/eng/nano/v11/i5/p601
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