Issues

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2020

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vol. 18 /

Issue 2

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M. Eh. Bondarenko, P. M. Sylenko, Yu. M. Solonin, A. V. Ragulya, N. I. Gubareni, M. N. Zahornyi, O. Yu. Khyzhun, N. Yu. Ostapovska
«Nanostructured Composite O-g-C\(_3\)N\(_4\)/TiO\(_2\) for Photocatalytic Application Fabricated by Means of Synthesis of O-Doped Carbon Nitride on the Surface of Anatase Nanoparticles»
265–282 (2020)

PACS numbers: 71.20.Nr, 72.80.Le, 72.80.Tm, 78.40.-q, 81.07.Wx, 81.15.Gh, 81.20.-n

The new nanostructured composite material O-g-C\(_3\)N\(_4\)/TiO\(_2\) (anatase phase) is synthesized by means of the gas-phase method by deposition O-doped g-C\(_3\)N\(_4\) on nanosize particles of anatase powder (with a particle size of \(\widetilde{=}\)10 nm) under special reaction conditions of melamine pyrolysis in the presence of fixed volume of air. The deposition of O-g-C\(_3\)N\(_4\) (\(\widetilde{=}\)5–6% O) on the surface of anatase powder nanoparticles is confirmed by x-ray phase analysis, scanning electron microscopy, x-ray photoelectron spectroscopy and infrared spectroscopy with Fourier transform. SEM micrographs of the O-g-C\(_3\)N\(_4\)/TiO\(_2\) composite (anatase) nanoparticles demonstrate the arrangement of TiO\(_2\) as separate globular nanoparticles and clusters between the plates and in the channels of the porous bladed plates O-g-C\(_3\)N\(_4\). Using the UV and visible spectroscopy, it is found that, in the series from g-C\(_3\)N\(_4\)/TiO\(_2\) to O-g-C\(_3\)N\(_4\)/TiO\(_2\), a bathochromic shift of the long-wavelength edge of fundamental absorption band is observed in the spectra, and the band gap decreases from 2.6 eV to 2.3 eV, respectively. The synthesis of the nanostructured O-g-C\(_3\)N\(_4\)/TiO\(_2\) composite (anatase phase) by means of a single-stage method can be used as a cost-effective way to avoid the disadvantages of each component and to realize the synergic effect for creating more adsorption centres and active reaction centres due to doping with oxygen atoms and the construction of a heterojunction to increase the photocatalytic activity of the material.

Keywords: nanocomposite O-g-C\(_3\)N\(_4\)/TiO\(_2\), anatase, O-doped carbon nitride, melamine, photocatalyst, pyrolysis

https://doi.org/10.15407/nnn.18.02.265

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