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Abstract <p>Titanium dioxide nanotube photoanodes were fabricated by anodizing titanium foil at 60 V in an ethylene glycol-based electrolyte using a two-step scheme. This process included intermediate removal of the amorphous coating followed by annealing at a temperature of 450°C. The nanotubes consist of titanium dioxide in the anatase form and have a length of 20–22 μm, an average diameter of 90–100 nm, and a wall thickness of 20 nm. The activity of this photoanode was studied in the photoelectrochemical oxidation reaction of ibuprofen (IBP), both in its molecular form and its ionic form as the potassium salt of 2-(4-isobutylphenyl)propionic acid (2-(4-IBP)K). Regardless of the form of IBP, its photoelectrocatalytic oxidation on the titanium dioxide nanotubes proceeds via the intermediate formation of oxygenated forms of IBP. The results from intensity-modulated photocurrent spectroscopy (IMPS) show that the addition of IBP to a saline solution (physiological saline) suppresses the recombination of electron-hole pairs due to an increased charge transfer rate to IBP. The stable operation of the TNT/Ti photoanode during prolonged photoelectro-oxidation of IBP was demonstrated.</p>

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Photoelectrochemical Degradation of Ibuprofen on a Titanium Dioxide Nanotube Photoanode

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • V. A. Grinberg,
  • V. V. Emets,
  • A. A. Averin

摘要

Abstract

Titanium dioxide nanotube photoanodes were fabricated by anodizing titanium foil at 60 V in an ethylene glycol-based electrolyte using a two-step scheme. This process included intermediate removal of the amorphous coating followed by annealing at a temperature of 450°C. The nanotubes consist of titanium dioxide in the anatase form and have a length of 20–22 μm, an average diameter of 90–100 nm, and a wall thickness of 20 nm. The activity of this photoanode was studied in the photoelectrochemical oxidation reaction of ibuprofen (IBP), both in its molecular form and its ionic form as the potassium salt of 2-(4-isobutylphenyl)propionic acid (2-(4-IBP)K). Regardless of the form of IBP, its photoelectrocatalytic oxidation on the titanium dioxide nanotubes proceeds via the intermediate formation of oxygenated forms of IBP. The results from intensity-modulated photocurrent spectroscopy (IMPS) show that the addition of IBP to a saline solution (physiological saline) suppresses the recombination of electron-hole pairs due to an increased charge transfer rate to IBP. The stable operation of the TNT/Ti photoanode during prolonged photoelectro-oxidation of IBP was demonstrated.