Synthesis and comparative photocatalytic activity of CuO layers on SiO2 substrates
https://doi.org/10.17586/2220-8054-2020-11-5-601-607
Abstract
Using the thermodynamic and kinetic approaches, it was found that Cu(NH3) complex predominating at 23◦C spontaneously decomposes at elevated temperatures, forming CuO precipitate in a bulk solution and a layer (CuO||SiO2) 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(NH3)complex. The formation of the CuO precipitate and layer is a two-step kinetic process. The rate of precipitate formation dominates above 65 C while the rate of the layer formation prevails below this value. The CuO||SiO2 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||SiO2 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.
Supporting agencies: This study has been performed in the framework of the State research program. The calculations were carried out on the URAN cluster at the Institute of Mathematics and Mechanics of the Ural Branch of the Russian Academy of Sciences.
About the Authors
E. V. Polyakov
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
91, Pervomaiskaya str., Ekaterinburg, 620990
R. R. Tzukanov
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
91, Pervomaiskaya str., Ekaterinburg, 620990
I. V. Volkov
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
91, Pervomaiskaya str., Ekaterinburg, 620990
L. Yu. Buldakova
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
91, Pervomaiskaya str., Ekaterinburg, 620990
I. V. Baklanova
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
91, Pervomaiskaya str., Ekaterinburg, 620990
O. A. Lipina
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
91, Pervomaiskaya str., Ekaterinburg, 620990
V. P. Zhukov
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
91, Pervomaiskaya str., Ekaterinburg, 620990
Yu. V. Kuznetsova
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
91, Pervomaiskaya str., Ekaterinburg, 620990
A. P. Tutyunnik
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
91, Pervomaiskaya str., Ekaterinburg, 620990
M. A. Maximova
Institute of Solid State Chemistry UB RAS
Russian Federation
Russian Federation
91, Pervomaiskaya str., Ekaterinburg, 620990
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Review
For citations:
Polyakov E.V., Tzukanov R.R., Volkov I.V., Buldakova L.Yu., Baklanova I.V., Lipina O.A., Zhukov V.P., Kuznetsova Yu.V., Tutyunnik A.P., Maximova M.A. Synthesis and comparative photocatalytic activity of CuO layers on SiO2 substrates. Nanosystems: Physics, Chemistry, Mathematics. 2020;11(5):601–607. https://doi.org/10.17586/2220-8054-2020-11-5-601-607
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