This paper describes the ozone oxidation kinetics of 1-naphthalene (1NS), 1,5-naphthalene (1,5NDS), and 3-nitrobenzene (3NBS) sulphonic acid. The presence of hydroxyl radicals and their effect on the overall rate of reaction was studied. Second order kinetic constants of direct reactions were estimated at around 252 M-1s-1, 41 M-1s-1 and 22 M-1s-1, for 1NS, 1,5NDS, and 3NBS sulphonic acids, respectively. At pH 3, the indirect reaction accounted for 2%, 15% and 4% of total primary oxidation of 1NS, 1,5NBS, and 3NBS sulphonic acids, respectively. At pH 9, indirect reaction contribution increased to 73%, 84% and 48%, respectively. C4 compounds (maleic and fumaric acids), C2 (oxalic), C1 (formic) and sulphate were identified as oxidation by-products in all cases. TOC slowly decreased throughout ozonation, reaching around 40-60% and 60-70% reduction over 90 minutes at pH 7 and 3, respectively.
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September 01 2001
Kinetics of ozone reactions with 1-naphthalene, 1,5-naphthalene and 3-nitrobenzene sulphonic acids in aqueous solutions
V. Calderara;
V. Calderara
*Department of Environment, Technical University of Berlin, Sekretariat KF-4, Strasse des 17 Juni 135, 10623 Berlin, Germany
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M. Jekel;
M. Jekel
**Chemical Engineering Department, PO Box 53-C Correo 3, University of Concepción, Concepción, Chile
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C. Zaror
C. Zaror
*Department of Environment, Technical University of Berlin, Sekretariat KF-4, Strasse des 17 Juni 135, 10623 Berlin, Germany
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Water Sci Technol (2001) 44 (5): 7–13.
Citation
V. Calderara, M. Jekel, C. Zaror; Kinetics of ozone reactions with 1-naphthalene, 1,5-naphthalene and 3-nitrobenzene sulphonic acids in aqueous solutions. Water Sci Technol 1 September 2001; 44 (5): 7–13. doi: https://doi.org/10.2166/wst.2001.0240
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