Abstract
The catalytic activity of nanotubular titanium dioxide films formed during the oxidation of acetone to carbon dioxide under the action of visible light with a wavelength of 450 nm was found to be approximately 2 times higher compared to standard titanium dioxide (Degussa P25). The nanotubular films were grown by the anodization of titanium foil using an original technique. Diffuse reflectance spectra of the films are attributed to enhanced activity in the visible spectrum by the nonstoichiometry of titanium dioxide near the interface between the nanotubular film and the titanium foil substrate.
Highlights
Nanostructural modifications of titanium dioxide are of great research interest, in the development of promising functional media for renewable energy sources[1,2,3,4], selective organic synthesis with atomic precision for direct C–H functionalization of a variety of organic molecules[5], the manufacture of efficient photoelectric transducers and memristor memory cells[6], the development of photocatalysts for the removal of organic impurities[7,8,9], and other applications[10,11,12]
The most promising possibility for generating oxygen vacancies in titanium dioxide is the growth of nanofilms from titanium foil, as has been achieved previously[6,15,16] or by sonoelectrochemical method[17]
Some indications of this phenomenon are apparent in the results of the photocatalytic activity of nanotubular films
Summary
Nanostructural modifications of titanium dioxide are of great research interest, in the development of promising functional media for renewable energy sources (i.e., solar cells and the photochemical decomposition of water)[1,2,3,4], selective organic synthesis with atomic precision for direct C–H functionalization of a variety of organic molecules[5], the manufacture of efficient photoelectric transducers and memristor memory cells[6], the development of photocatalysts for the removal of organic impurities[7,8,9], and other applications[10,11,12]. The most promising possibility for generating oxygen vacancies in titanium dioxide is the growth of nanofilms from titanium foil, as has been achieved previously[6,15,16] or by sonoelectrochemical method[17]. In this case, deficiencies in oxygen can appear in the vicinity of the nonstoichiometric contact between titanium dioxide and titanium. Deficiencies in oxygen can appear in the vicinity of the nonstoichiometric contact between titanium dioxide and titanium Some indications of this phenomenon are apparent in the results of the photocatalytic activity of nanotubular films. The aim of the present work is to consider the growth of the nanotubular titanium dioxide film with nonstoichiometry near the interface with titanium foil in detail, and to study the photocatalytic activity of such films under visible light by a reliable technique – the oxidation of acetone to CO2
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