PHOTOELECTROCATALYTIC DEGRADATION OF AMINO-AZODYES BY TITANIUM DIOXIDE WITH SURFACE STATES OF Ti3+

Authors

  • Georgii V. Sokolsky NTUU "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine
  • Мaksym N. Zahornyi Frantsevich Institute for Problems in Materials Science NA, Ukraine
  • Тatyana F. Lobunets Institute for Problems in Materials Science,
  • Nadiya І. Tyschenko National Aviation University, Ukraine
  • Alexander. V. Shyrokov 3Institute for Problems in Materials Science, Ukraine
  • Аndrey V. Ragulya Frantsevich Institute for Problems in Materials Science NAS, Ukraine
  • Serhii V. Іvanov National Academy of Art and Culture Leaders,
  • Nadezhda V. Gayuk National Aviation University, Ukraine
  • Vladimir Е. Sokol’skii Taras Shevchenko Kyiv National University, Ukraine
  • Luiza V. Zudina Taras Shevchenko Kyiv National University, Ukraine

DOI:

https://doi.org/10.15421/081914

Keywords:

titanium dioxide, photoelectrocatalysis, degradation, amino dye.

Abstract

The photoelectrocatalytic degradation process of a methyl orange amino acid dye (MO) under the influence of UV irradiation in a neutral salt electrolyte was studied using a catalyst - titanium dioxide of nanodispersed morphology. Anatase structure synthesized from a suspension of hydrated titanium dioxide TiO (OH)2. The activity of standard samples was also compared (P25 with an anatase / rutile phase ratio of 80:20, pure rutile). The phase composition, unit cell parameters, and dispersion of the samples were determined by X-ray diffraction method. The results of thermogravimetric measurements, porosity characteristics were analyzed. The presence of Ti3 + defects is shown for the synthesized sample, which may be the reason for a decreasing of the band gap semiconductor to 2.75 eV and increasing the anodic oxidation currents of MOs under UV irradiation at high scan rates (from 50 mV / s) and potentials up to 500 mV (CSE) in comparison with standard samples. The photoelectrocatalytic activity of the samples was determined by nanodispersity, crystallite morphology, pore size distribution. Photoelectrocatalytic activity varied symbatically with the concentration of Ti3 +, surface hydroxide groups.

Author Biography

Georgii V. Sokolsky, NTUU "Igor Sikorsky Kyiv Polytechnic Institute"

physical chemistry department

professor

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Published

2019-10-31

Issue

Vol. 27 No. 2 (2019): Journal of Chemistry and Technologies

Section

Physical and inorganic chemistry

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