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Related Concept Videos

Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.

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The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
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Ozone formation from illuminated titanium dioxide surfaces.

María Eugenia Monge1, Christian George, Barbara D'Anna

  • 1Institut de recherches sur la catalyse et l'environnement de Lyon, CNRS UMR 5256, Université Lyon 1. 2, Av. Albert Einstein, F-69626 Villeurbanne Cedex, France.

Journal of the American Chemical Society
|June 1, 2010
PubMed
Summary

This study reveals titanium dioxide (TiO2) surfaces illuminated with light can produce ozone (O3). This occurs through nitrate anion photochemistry, enhancing the surface

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Area of Science:

  • Photocatalysis
  • Surface Chemistry
  • Atmospheric Chemistry

Background:

  • Titanium dioxide (TiO2) photocatalysis is known to decompose nitrogen oxides (NOx).
  • The formation of non-nitrogen containing products from NOx decomposition on TiO2 surfaces is not well understood.
  • Nitrate anions can be present on TiO2 surfaces from various sources.

Purpose of the Study:

  • To investigate the formation of non-nitrogen containing products during the photolysis of NOx on TiO2 surfaces.
  • To identify gaseous products formed upon irradiation of TiO2 surfaces with adsorbed nitrate anions.
  • To elucidate the mechanism of ozone (O3) formation from illuminated TiO2 surfaces.

Main Methods:

  • Irradiation of TiO2 coated glass surfaces and TiO2 films with adsorbed nitrate anions (KNO3 or from gaseous NOx) using broad-band light.
  • Detection of gas phase products using analytical techniques.
  • Analysis of surface charge transfer reactions and photochemistry.

Main Results:

  • Gas phase products NO2, HNO2, and O3 were detected upon irradiation.
  • Ozone (O3) formation from TiO2 surfaces was observed for the first time.
  • Surface charge transfer reactions oxidized nitrate anions to nitrate radicals, leading to O3 formation.

Conclusions:

  • Illuminated TiO2 surfaces with nitrate anions can produce ozone (O3).
  • The photochemistry of nitrate radicals on TiO2 surfaces is responsible for O3 generation.
  • This process enhances the oxidizing capacity of TiO2 surfaces.