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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Photochemistry of atmospheric dust: Ozone decomposition on illuminated titanium dioxide
Environmental Science and Technology, Volume 43, No. 19, Year 2009
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Description
The ozone decomposition onto mineral surfaces prepared with traces of solid TiO2 in a matrix of SiO2 in order to mimic mineral dust particles has been investigated using a coated-wall flow-tube system at room temperature and atmospheric pressure. The ozone uptake coefficients were measured both under dark conditions and irradiation using near UV-light. While uptake in the dark was negligible, a large photo-enhanced ozone uptake was observed. For TiO2/SiO2 mixtures under irradiation, the uptake coefficients increased with increasing TiO2 mass fraction (from 1 to 3 wt %), and the corresponding uptake coefficient based on the geometric surfaces ranged from 3 × 10-6 to 3 × 10 -5. The uptake kinetics was also observed to increase with decreasing ozone concentration between 290 and 50 ppbv. Relative humidity influenced the ozone uptake on the film, and a reduced ozone loss was observed for relative humidity above 30%. The experimental results suggest that under atmospherically relevant conditions the photochemistry of dust can represent an important sink of ozone inside the dust plume. © 2009 American Chemical Society.
Authors & Co-Authors
Nicolas, Mélanie
France, Villeurbanne
Université Claude Bernard Lyon 1
Ndour, Marième
France, Villeurbanne
Université Claude Bernard Lyon 1
Senegal, Dakar
Université Cheikh Anta Diop de Dakar
Ka, Oumar
Senegal, Dakar
Université Cheikh Anta Diop de Dakar
D’Anna, Barbara
France, Villeurbanne
Université Claude Bernard Lyon 1
George, Christian
France, Villeurbanne
Université Claude Bernard Lyon 1
Statistics
Citations: 71
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.1021/es901569d
ISSN:
0013936X
e-ISSN:
15205851
Research Areas
Environmental