Abstract
Synthesis and comparative photocatalytic activity of CuO layers on SiO2 substrates
Highlights
A low efficiency of applied light utilization is considered to be the main drawback of powder photocatalysts
The search for synthesis conditions of CuO||SiO2 layers on the inner surface of the quartz reactor (SiO2) was carried out in 50 ml quartz vials filled with 25 ml 0.02–0.3 M copper(II) amine solution, C(Cu), with free ammonia concentration in the range of 0.4–4.0 M at thermostat temperature up to 95◦
Using thermodynamic and kinetic approaches, it was found that the Cu(NH3)24+aq complex predominating at 23◦ spontaneously decomposes at elevated temperature with the deposition of CuO phase in the form of the precipitate in a bulk solution and layer on the surface of silica glass (CuO||SiO2)
Summary
A low efficiency of applied light utilization is considered to be the main drawback of powder photocatalysts It can be improved by fixing micro- and nanoparticles of active material on substrates in the form of films and layers [1,2,3]. The more simple and convenient method is the thermal decomposition of ammonia complexes of Cu(II) [9] This unites the formation of primary CuO particles, their isolation and growth at the interface. The application of this method for the synthesis of photomaterials is restrained by the lack of information concerning synthesis conditions and the photocatalytic activity of produced CuO layers. The aim of present study was to invent a single-stage hydrochemical method for the production of CuO photocatalyst layers with optimal mass (thickness) on glass substrates by the thermal decomposition of ammonia complexes of Cu(II) in the conditions excluding the formation of Cu2O
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