Photodecomposition of ozone sensitised by a film of titanium dioxide on glass

A. Mills, Soo-Keun Lee, Anne Lepre

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

High levels of ozone (typically 850 ppm) are readily decomposed by semiconductor photocatalysis, using a thin film of the semiconductor titanium dioxide (Degussa P25 TiO2) cast on a glass tube, and UVA light, i.e. light of energy greater than that of the bandgap of the semiconductor (ultra-bandgap light); in the absence of this light the thermal decomposition of ozone is relatively slow. The semiconductor films show no evidence of chemical or photochemical wear with repeated use. At high levels of ozone, i.e. 100 ppm less than or equal to [O-3] less than or equal to 1400 ppm, the initial rate of ozone decomposition by semiconductor photocatalysis is independent of [O-3], whereas, at lower ozone concentrations, i.e. 5 ppm less than or equal to [O-3] less than or equal to 100 ppm, the initial rate of ozone photodestruction decreases in a smooth, but non-linear, manner with decreasing [O-3]. The kinetics of ozone photodecomposition fit a Langmuir-Hinshelwood type kinetic equation and the possible mechanistic implications of these results are briefly discussed.
LanguageEnglish
Pages199-205
Number of pages6
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume155
Issue number1-3
DOIs
Publication statusPublished - 20 Feb 2003

Fingerprint

photodecomposition
Ozone
titanium oxides
Titanium dioxide
ozone
Glass
glass
Semiconductor materials
Photocatalysis
Energy gap
Kinetics
titanium dioxide
kinetic equations
thermal decomposition
casts
Pyrolysis
Wear of materials
tubes
Decomposition
decomposition

Keywords

  • ozone
  • photocatalysis
  • semiconductor
  • photodecomposition
  • titanium dioxide

Cite this

Mills, A. ; Lee, Soo-Keun ; Lepre, Anne. / Photodecomposition of ozone sensitised by a film of titanium dioxide on glass. In: Journal of Photochemistry and Photobiology A: Chemistry. 2003 ; Vol. 155, No. 1-3. pp. 199-205.
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Photodecomposition of ozone sensitised by a film of titanium dioxide on glass. / Mills, A.; Lee, Soo-Keun; Lepre, Anne.

In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 155, No. 1-3, 20.02.2003, p. 199-205.

Research output: Contribution to journalArticle

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N2 - High levels of ozone (typically 850 ppm) are readily decomposed by semiconductor photocatalysis, using a thin film of the semiconductor titanium dioxide (Degussa P25 TiO2) cast on a glass tube, and UVA light, i.e. light of energy greater than that of the bandgap of the semiconductor (ultra-bandgap light); in the absence of this light the thermal decomposition of ozone is relatively slow. The semiconductor films show no evidence of chemical or photochemical wear with repeated use. At high levels of ozone, i.e. 100 ppm less than or equal to [O-3] less than or equal to 1400 ppm, the initial rate of ozone decomposition by semiconductor photocatalysis is independent of [O-3], whereas, at lower ozone concentrations, i.e. 5 ppm less than or equal to [O-3] less than or equal to 100 ppm, the initial rate of ozone photodestruction decreases in a smooth, but non-linear, manner with decreasing [O-3]. The kinetics of ozone photodecomposition fit a Langmuir-Hinshelwood type kinetic equation and the possible mechanistic implications of these results are briefly discussed.

AB - High levels of ozone (typically 850 ppm) are readily decomposed by semiconductor photocatalysis, using a thin film of the semiconductor titanium dioxide (Degussa P25 TiO2) cast on a glass tube, and UVA light, i.e. light of energy greater than that of the bandgap of the semiconductor (ultra-bandgap light); in the absence of this light the thermal decomposition of ozone is relatively slow. The semiconductor films show no evidence of chemical or photochemical wear with repeated use. At high levels of ozone, i.e. 100 ppm less than or equal to [O-3] less than or equal to 1400 ppm, the initial rate of ozone decomposition by semiconductor photocatalysis is independent of [O-3], whereas, at lower ozone concentrations, i.e. 5 ppm less than or equal to [O-3] less than or equal to 100 ppm, the initial rate of ozone photodestruction decreases in a smooth, but non-linear, manner with decreasing [O-3]. The kinetics of ozone photodecomposition fit a Langmuir-Hinshelwood type kinetic equation and the possible mechanistic implications of these results are briefly discussed.

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