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<p>It has been established that during the hydrothermal sol–gel synthesis of sulfuric acid-modified TiO<sub>2</sub> nanostructures (S-TiO<sub>2</sub> nanostructures), a crystalline anatase phase is formed, which remains stable up to 800°C, and the anatase to rutile phase transition begins at 850°C. Increasing the calcination temperature of S-TiO<sub>2</sub> nanostructures gradually leads to the densification of loosely agglomerated anatase crystallites and, finally, their sintering, which leads to a decrease in the specific surface area. As a result, the photocatalytic activity of such nanostructures in the process of doxycycline photodegradation under visible light irradiation and hydrogen release from water–alcohol mixtures under ultraviolet light irradiation increases with elevating calcination temperature, but decreases exceeding after 470°C.</p>

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Photocatalytic Activity of Sulfuric Acid-Modified TiO2 in the Processes of Doxycycline Photodegradation and Molecular Hydrogen Release

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • N. I. Romanovska,
  • G. V. Korzhak,
  • V. M. Grebennikov,
  • O. V. Shulzhenko,
  • P. A. Manoryk

摘要

It has been established that during the hydrothermal sol–gel synthesis of sulfuric acid-modified TiO2 nanostructures (S-TiO2 nanostructures), a crystalline anatase phase is formed, which remains stable up to 800°C, and the anatase to rutile phase transition begins at 850°C. Increasing the calcination temperature of S-TiO2 nanostructures gradually leads to the densification of loosely agglomerated anatase crystallites and, finally, their sintering, which leads to a decrease in the specific surface area. As a result, the photocatalytic activity of such nanostructures in the process of doxycycline photodegradation under visible light irradiation and hydrogen release from water–alcohol mixtures under ultraviolet light irradiation increases with elevating calcination temperature, but decreases exceeding after 470°C.