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Photoenhanced NO2 loss on simulated urban grime.

Authors
  • Ammar, Rachid
  • Monge, Maria Eugenia
  • George, Christian
  • D'Anna, Barbara
Type
Published Article
Journal
ChemPhysChem
Publisher
Wiley (John Wiley & Sons)
Publication Date
Dec 17, 2010
Volume
11
Issue
18
Pages
3956–3961
Identifiers
DOI: 10.1002/cphc.201000540
PMID: 20872392
Source
Medline
License
Unknown

Abstract

The present study focuses on the heterogeneous reaction between gaseous NO(2) and solid pyrene/KNO(3) films, used as a simplified proxy of urban grime. This reaction is investigated under simulated atmospheric conditions with respect to relative humidity, NO(2) concentration and irradiation in a coated-wall flow-tube reactor. The geometric steady-state uptake coefficients γ(geo) for pyrene/KNO(3) films exposed to 50 ppbv of NO(2) ranged from 1.12×10(-7) in the dark to 2.67×10(-6) under near-UV irradiation (300-420 nm) and decreased with increasing NO(2) concentration in the range 30-120 ppbv. NO(2) removal is linearly dependent on light intensity, with release of gas-phase NO and HONO. Analysis of the solid film by ion chromatography and GC-MS showed the formation of nitrite ions and traces of 1-nitropyrene. A light-induced reaction mechanism is proposed. The results discussed herein suggest that PAH-containing urban grime on windows and buildings may be a key player in urban air pollution.

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