Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1887234 | Radiation Physics and Chemistry | 2008 | 7 Pages |
Abstract
H radicals react with chlorobenzoic acids and chlorobenzene (k(H+substrates)=(0.7-1.5)Ã109Â dm3Â molâ1Â sâ1) by addition to the benzene ring forming H adducts with characteristic absorption bands in the range of 310-360Â nm. The rate constants for their second-order decay are 2k=(3.5-6)Ã108Â dm3Â molâ1Â sâ1. By reduction with eaqâ fragmentation and chloride release was established for 2- and 4-chlorobenzoic acid, for 3-chlorobenzoic acid the addition of electrons to the carboxylate group was observed by pulse radiolysis. By gamma radiolysis could be proved that these radical anions undergo intramolecular electron transfer and quantitave dechlorination. The efficiency in degradation was 4-chlorobenzoic acid>3-chlorobenzoic acid>2-chlorobenzoic acid. Benzoic acid was found as final product for all substrates.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
Robert Zona, Sonja Solar, Nikola Getoff, Knud Sehested, Jerzy Holcman,