Journal
CHEMOSPHERE
Volume 68, Issue 3, Pages 572-578Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2006.12.038
Keywords
perfluorocarboxylic acid; photocatalyst; decomposition; iron
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The photochemical decomposition of short-chain (C(3)-C(5)) perfluorocarboxylic acids (PFCAs) was investigated. Direct photolysis in water proceeded slowly with the 220- to 460-nm light emission from a xenon-mercury lamp to form F(-), CO(2), and shorter-chain PFCAs. Addition of a small amount of Fe(3+) to the aqueous solutions of the PFCAs dramatically enhanced their photochemical decomposition under an oxygen atmosphere: when the (initial PFCA)/(initial Fe(3+)) molar ratio was 13.5 (initial PFCA concentration = 67.3 mM), the pseudo-first-order rate constants for the PFCA decomposition were 3.6-5.3 times those with photolysis alone, and the turnover number for the catalytic PFCA decomposition [i.e., (moles of decomposed PFCA)/(moles of initial Fe(3+))] reached 6.71-8.68 after 24 h of irradiation. The catalysis can be explained by photoredox reactions between PFCA. Fe(3+)/Fe(2+) and oxygen via photo-induced complexation of Fe(3+) with the PFCAs. (c) 2006 Elsevier Ltd. All rights reserved.
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