Atmos. Chem. Phys. Discuss., 9, 21647-21668, 2009
www.atmos-chem-phys-discuss.net/9/21647/2009/
doi:10.5194/acpd-9-21647-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Heterogeneous ozonation kinetics of 4-phenoxyphenol in presence of photosensitizer
S. Net, L. Nieto-Gligorovski, S. Gligorovski, and H. Wortham
Universités d'Aix-Marseille I, II, III – CNRS, UMR 6264: Laboratoire Chimie Provence, Equipe Instrumentation et Réactivité Atmosphérique, Case courrier 29, 3 place Victor Hugo, 13331 Marseille Cedex 03, France

Abstract. In this work we have quantitatively measured the degradation of 4-phenoxyphenol adsorbed on silica particles following oxidative processing by gas-phase ozone. This was performed under dark conditions and in presence of 4-carboxybenzophenone under simulated sunlight irradiation of the particles surface.

At mixing ratio of 60 ppb which corresponds to strongly ozone polluted areas, the first order decay of 4-phenoxyphenol is k1=9.95×10−6 s−1. At very high ozone mixing ratio of 6 ppm the first order rate constants for 4-phenoxyphenol degradation were the following: k1=2.86×10−5 s−1 under dark conditions and k1=5.58×10−5 s−1 in presence of photosensitizer (4-carboxybenzophenone) under light illumination of the particles surface. In both cases the experimental data do follow the modified Langmuir-Hinshelwood equation for surface reactions. Langmuir-Hinshelwood and Langmuir-Rideal mechanisms are also discussed along with the experimental results.

Most importantly, the quantities of the oligomers such as 2-(4-Phenoxyphenoxy)-4-phenoxyphenol and 4-[4-(4-Phenoxyphenoxy)phenoxy]phenol formed during the heterogeneous ozonolysis of adsorbed 4-phenoxyphenol were much higher under solar light irradiation of the surface in comparison to the dark conditions.


Citation: Net, S., Nieto-Gligorovski, L., Gligorovski, S., and Wortham, H.: Heterogeneous ozonation kinetics of 4-phenoxyphenol in presence of photosensitizer, Atmos. Chem. Phys. Discuss., 9, 21647-21668, doi:10.5194/acpd-9-21647-2009, 2009.
 
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