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Impact of the anodization time on the photocatalytic activity of TiO₂ nanotubes.

ABSTRACT: Titanium oxide nanotubes (TNTs) were anodically grown in ethylene glycol electrolyte. The influence of the anodization time on their physicochemical and photoelectrochemical properties was evaluated. Concomitant with the anodization time, the NT length, fluorine content, and capacitance of the space charge region increased, affecting the opto-electronic properties (bandgap, bathochromic shift, band-edge position) and surface hydrophilicity of TiO₂ NTs. These properties are at the origin of the photocatalytic activity (PCA), as proved with the photooxidation of methylene blue.

SUBMITTER: Diaz-Real JA

PROVIDER: S-EPMC6204776 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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Impact of the anodization time on the photocatalytic activity of TiO<sub>2</sub> nanotubes.

Díaz-Real Jesús A JA Dubed-Bandomo Geyla C GC Galindo-de-la-Rosa Juan J Arriaga Luis G LG Ledesma-García Janet J Ledesma-García Janet J Alonso-Vante Nicolas N

Beilstein journal of nanotechnology 20181004

Titanium oxide nanotubes (TNTs) were anodically grown in ethylene glycol electrolyte. The influence of the anodization time on their physicochemical and photoelectrochemical properties was evaluated. Concomitant with the anodization time, the NT length, fluorine content, and capacitance of the space charge region increased, affecting the opto-electronic properties (bandgap, bathochromic shift, band-edge position) and surface hydrophilicity of TiO<sub>2</sub> NTs. These properties are at the orig ...[more]

PMID: 30416913

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Project description:Nanotube/nanowire-structured TiO2 was formed on the Ti surface by an anodic oxidation method performed at different potential values (50 or 60 V) and for different times (3 or 5 h). The TiO2 photocatalysts were taken in powder form using the ultrasonic treatment from the Ti electrodes, calcined at different temperatures, and characterized by XRD and SEM techniques, and BET surface area analyses. Both the crystallinity and the size of the primary TiO2 particles increased by increasing the heat treatment temperature. While all the photocatalysts heat treated up to 500°C were only in the anatase phase, the particles heat-treated at 700°C consisted of both anatase and rutile phases. The BET specific surface area of the samples decreased drastically after heat treatment of 700°C because of partial sinterization. SEM analyses indicated that the prepared materials were structured in both nanotubes and nanowires. They were tested as photocatalysts for the selective oxidation of glycerol and 3-pyridinemethanol under UVA irradiation in water at room temperature and ambient pressure. Glyceraldehyde, 1,3-dihydroxyacetone, and formic acid were determined as products in glycerol oxidation, while the products of 3-pyridinemethanol oxidation were 3-pyridinemethanal and vitamin B3. Non-nanotube/nanowire-structured commercial (Degussa P25 and Merck TiO2) photocatalysts were used for the sake of comparison. Low selectivity values towards the products obtained by partial oxidation were determined for glycerol. On the contrary, higher selectivity values towards the products were obtained (total 3-pyridinemethanal and vitamin B3 selectivity up to ca. 90%) for the photocatalytic oxidation of 3-pyridinemethanol. TiO2 photocatalysts must be highly crystalline (calcined at 700°C) for effective oxidation of glycerol, while for the selective oxidation of 3-pyridinemethanol it was not necessary to obtain a high crystallinity, and the optimal heat treatment temperature was 250°C. Glycerol and its oxidation products could more easily desorb from highly crystalline and less hydroxylated surfaces, which would justifies their higher activity. The prepared photocatalysts showed lower activity than Degussa P25, but a greater selectivity towards the products found.

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Impact of the anodization time on the photocatalytic activity of TiO₂ nanotubes.

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Impact of the anodization time on the photocatalytic activity of TiO<sub>2</sub> nanotubes.

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Impact of the anodization time on the photocatalytic activity of TiO2 nanotubes.

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Impact of the anodization time on the photocatalytic activity of TiO<sub>2</sub> nanotubes.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Impact of the anodization time on the photocatalytic activity of TiO₂ nanotubes.