Photochemical oxidation of short-chain polychlorinated n-alkane mixtures using H2O2-UV and the photo-Fenton reactionReportar como inadecuado




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International Journal of Photoenergy - Volume 6 2004, Issue 2, Pages 81-88

Department of Chemistry, University of Winnipeg, 515 Portage Avenue, Winnipeg, Manitoba R3B 2E9, Canada



Copyright © 2004 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 photochemical oxidation of a series of short-chain polychlorinated n-alkane PCA mixtureswas investigated using H2O2-UV and modified photo-Fenton conditions Fe3+-H2O2-UV in both Milli-Q and lake water. All PCA mixtures, including chlorinated Cl5 to Cl8 decanes, undecanes, dodecanes andtridecanes degraded in 0.02 M H2O2-UV at pH 2.8 in pure water, with 80±4% disappearance after 3 h of irradiation using a 300 nm light source. Degradation was somewhat enhanced under similar conditions butin natural water. The modified photo-Fenton system was more effective in degrading PCAs, with 72% and 80%disappearance of chlorinated decanes in 45 min of irradiation in pure and natural water, respectively. Carbonchain-length had minimal effect on degradation rates; however, increased degree of chlorination from Cl5 to Cl8 resulted in slower initial degradation rates and less complete conversion after 3 h of irradiation. Threehours of irradiation in natural water-H2O2-UV resulted in 95% degradation of parent PCAs accompanied by93% release of chloride ion. Quantitative dechlorination, which may be indicative of complete mineralization,suggests that this is an effective water remediation technique for PCAs.





Autor: Ken J. Friesen, Taha M. El-Morsi, and Alaa S. Abd-El-Aziz

Fuente: https://www.hindawi.com/



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