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Kinetics of ozone photolysis in aqueous solution
Author(s) -
Gurol Mirat D.,
Akata Aysegul
Publication year - 1996
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690421128
Subject(s) - ozone , photodissociation , chemistry , aqueous solution , hydroxyl radical , kinetics , decomposition , photochemistry , quantum yield , radical , organic chemistry , physics , quantum mechanics , fluorescence
Abstract The kinetics of ozone photolysis were investigated experimentally in well‐characterized aqueous solution and by a conceptual kinetic and mechanistic model developed based on possible reaction pathways. The primary quantum yield of ozone photolysis at 245‐nm wavelength was measured at 20°C as 0.48 ± 0.6. The rate of ozone photolysis increased with increasing light intensity, ozone concentration and pH, and decreased with increasing inorganic carbon concentration in water. The model was able to predict the experimentally observed rate of ozone photolysis quite well for various combinations of UV light intensity, initial ozone concentration and water characteristics. In the mechanistic model, the formation of the hydroxyl radical, which is the primary oxidant in the O 3 /UV process, was tied to the decomposition of ozone; therefore, the model can now be extended to predict the oxidation rates of water contaminants by the hydroxyl radical generated in the O 3 /UV process.