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0219U100778,
0115U002972
,
Struktural, spectral, luminescent, catalstic and photocatalytsc properties of mesoporous carbon nitride and monolayer and their heterostructures with nanoparticles of metals and semiconductors
Kuchmii Stepan Ya.,
13-03-2019
L. V. Pisarzhevskii Institute Of Physical Chemistry of The National Academy of Sciences of Ukraine
Influence of the conditions of synthesis of crystalline graphite-like carbon nitride on its photocatalytic activity under the influence of visible light in the processes of hydrogen evolution from aqueous solutions of lactic acid and ethanol, as well as gas phase partial oxidation of alcohols is investigated. The obtained samples exhibit higher photocatalytic activity than massive carbon nitride, due to the increase in the intensity of the absorption band and the displacement of its edge to the visible range of the spectrum, the improvement of the crystalline structure and the reduction of defects amount - the centers of recombination of photogenerated charges, as well as the reduction of the particle size, which facilitates the output of photogenerated charges on the surface of the sample where the oxidation-reduction transformations of the substrate molecules take place. Ruthenium nanocatalysts have been obtained on the basis of massive and porous graphite carbon nitride, as well as nitrogen-containing and undoped carbon nanomaterials that have been tested in the process of oxidation of betulin. It was shown that the Ru nanoparticles deposited on carbon nitride, obtained by the exotemplate method exhibit higher catalytic activity in the betulin oxidation reaction than Ru deposited on nitrogen-containing carbon samples (conversion of betulin to 70% and 30% respectively), which may be due to a significant the content of weak basic centers on the surface of carbon nitride, necessary for the course of the catalytic process. The main target product of heterogeneous-catalytic oxidation of betulin is betulone, which is formed with a sufficiently high selectivity - up to 27%, with a yield of about 14% (for 3 hours).
2020-04-02
Updated: 2025-12-08
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