Effect of post-annealing on the photocatalytic activity of hydrothermally synthesised titania nanotubes

S Wadhwa, JWJ Hamilton, PSM Dunlop, C Dickinson, JA Byrne

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Heterogeneous photocatalysis has been reported to be effective for the degradation of a wide range of organic pollutants and the inactivation of pathogens in water. The use of nanostructured materials is one approach to improving photocatalytic efficiency. Titanate nanotubes were prepared by a hydrothermal synthesis and annealing yielded titania nanotubes, nanorods and crystals. These materials were characterized using XRD, XPS, BET and TEM. The photocatalytic activities were studied using phenol and formic acid as model pollutants. The as prepared titanate nanotubes had a very high specific surface area (401 m2g-1). Annealing at 400oC gave anatase TiO2, however, the tubular structure collapsed to rods leaving only 30% nanotubes. The sample containing 30% nanotubes was found to be 3.4 times more active than Degussa P25 for the photocatalytic oxidation of formic acid. Annealing at temperatures higher than 400oC caused a reduction in photocatalytic activity for the oxidation of formic acid. This correlated to a decrease in the specific surface area of the samples. In the case of phenol, the rate of photocatalytic oxidation increased with increasing annealing temperature, with the nanocrystals obtained at 700oC showing the highest rate, yet still lower than that observed for P25.
LanguageEnglish
Pages147-157
JournalJournal of Advanced Oxidation Technologies
Volume14
Issue number1
Publication statusPublished - 21 Feb 2011

Fingerprint

formic acid
Nanotubes
Annealing
Phenol
Specific surface area
Oxidation
Photocatalysis
Organic pollutants
Hydrothermal synthesis
Pathogens
Nanorods
Nanostructured materials
Nanocrystals
Thermodynamic properties
X ray photoelectron spectroscopy
titanium dioxide
Transmission electron microscopy
Degradation
Temperature
Crystals

Cite this

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title = "Effect of post-annealing on the photocatalytic activity of hydrothermally synthesised titania nanotubes",
abstract = "Heterogeneous photocatalysis has been reported to be effective for the degradation of a wide range of organic pollutants and the inactivation of pathogens in water. The use of nanostructured materials is one approach to improving photocatalytic efficiency. Titanate nanotubes were prepared by a hydrothermal synthesis and annealing yielded titania nanotubes, nanorods and crystals. These materials were characterized using XRD, XPS, BET and TEM. The photocatalytic activities were studied using phenol and formic acid as model pollutants. The as prepared titanate nanotubes had a very high specific surface area (401 m2g-1). Annealing at 400oC gave anatase TiO2, however, the tubular structure collapsed to rods leaving only 30{\%} nanotubes. The sample containing 30{\%} nanotubes was found to be 3.4 times more active than Degussa P25 for the photocatalytic oxidation of formic acid. Annealing at temperatures higher than 400oC caused a reduction in photocatalytic activity for the oxidation of formic acid. This correlated to a decrease in the specific surface area of the samples. In the case of phenol, the rate of photocatalytic oxidation increased with increasing annealing temperature, with the nanocrystals obtained at 700oC showing the highest rate, yet still lower than that observed for P25.",
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Effect of post-annealing on the photocatalytic activity of hydrothermally synthesised titania nanotubes. / Wadhwa, S; Hamilton, JWJ; Dunlop, PSM; Dickinson, C; Byrne, JA.

In: Journal of Advanced Oxidation Technologies, Vol. 14, No. 1, 21.02.2011, p. 147-157.

Research output: Contribution to journalArticle

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AB - Heterogeneous photocatalysis has been reported to be effective for the degradation of a wide range of organic pollutants and the inactivation of pathogens in water. The use of nanostructured materials is one approach to improving photocatalytic efficiency. Titanate nanotubes were prepared by a hydrothermal synthesis and annealing yielded titania nanotubes, nanorods and crystals. These materials were characterized using XRD, XPS, BET and TEM. The photocatalytic activities were studied using phenol and formic acid as model pollutants. The as prepared titanate nanotubes had a very high specific surface area (401 m2g-1). Annealing at 400oC gave anatase TiO2, however, the tubular structure collapsed to rods leaving only 30% nanotubes. The sample containing 30% nanotubes was found to be 3.4 times more active than Degussa P25 for the photocatalytic oxidation of formic acid. Annealing at temperatures higher than 400oC caused a reduction in photocatalytic activity for the oxidation of formic acid. This correlated to a decrease in the specific surface area of the samples. In the case of phenol, the rate of photocatalytic oxidation increased with increasing annealing temperature, with the nanocrystals obtained at 700oC showing the highest rate, yet still lower than that observed for P25.

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