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International Journal of Photoenergy
Volume 3 (2001), Issue 2, Pages 95-101
http://dx.doi.org/10.1155/S1110662X01000113

Oxidation of PAHs in water solution by ozone combined with ultraviolet radiation

Faculty of Process and Environmental Engineering, Technical University of Łódź, ul. Wólczańska 213, Łódź 90-924, Poland

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The oxidation of three polycyclic aromatic hydrocarbons (PAHs): benzo[a]pyrene (BAP), chrysene (CHR) and fluorene (FLU) in aqueous solution using ozone assisted by UV radiation was investigated. The influence of pH of the reaction mixture, ozone concentration and the presence of a radical scavenger on the reaction rate was determined. The highest rate of PAHs disappearance was achieved in acidic solutions. The radical scavenger-tert-butanol, effectively inhibited the rate of BAP and CHR destruction but had a slight influencein thecaseof FLU. Therateconstants of direct reaction of PAHs with ozonewe recalculate d using our earlier investigations and they were equal to 6.8×104; 6.9×103 and 62M-1s-1 for BAP, CHR and FLU, respectively. The contributions of direct ozonolysis, photolysis and radical reaction to PAHs oxidation in O3/UV system were evaluated.