Abstract
The influence of the regimes of detonation spraying the Ti-TiO2 based coatings on its photocatalytic properties is studied. The spray distance and the speed of passage of the detonation gun are varied when the coatings are applied. The microstructure and phase composition are studied. It is found that proportion of rutile prevails over the other phases in all samples obtained under all spray regimes used. The kinetics of photocatalytic reaction basing on Langmuir-Hinshelwood model of heterogeneous photocatalysis is analyzed. The photocatalytic activity and the rate constant of photocatalytic reaction of the coatings decrease with an increase in the spray distance. New equation describing the dependence observed is proposed. The decrease in the rate constant occurs according to a power law. The photocatalytic activity and the rate constant of the photocatalytic reaction of coatings increase with an increase in the rutile percentage. New equation describing such dependence is proposed. The increase occurs according to an exponential law. The photocatalytic rate constant depends on the speed of passage accordingly with a parabolic law.
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