Heterogeneous ozonation kinetics of 4-phenoxyphenol in the presence of photosensitizer 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
Received: 29 Sep 2009 – Published in Atmos. Chem. Phys. Discuss.: 15 Oct 2009 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 the presence of 4-carboxybenzophenone under
simulated sunlight irradiation of the particles surface.
Revised: 17 Dec 2009 – Accepted: 17 Dec 2009 – Published: 15 Feb 2010
At the mixing ratio of 60 ppb which corresponds to strongly polluted
ozone areas, the first order of decay of 4-phenoxyphenol is
k1=9.95×10−6 s−1. At a 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 the presence of
photosensitizer (4-carboxybenzophenone) under light illumination of
the particles surface. In both cases, the experimental data follow
the modified Langmuir-Hinshelwood equation for surface reactions.
The Langmuir-Hinshelwood and Langmuir-Rideal mechanisms for
bimolecular surface reactions are also discussed along with the
Most importantly, the quantities of the oligomers such as
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 the presence of photosensitizer, Atmos. Chem. Phys., 10, 1545-1554, doi:10.5194/acp-10-1545-2010, 2010.