Photolytic degradation of triclosan in the presence of surfactants

Chen, Zhongliang, Song, Qijun, Cao, Guangqun and Chen, Yanfei Photolytic degradation of triclosan in the presence of surfactants Chemical Papers, Vol.62, No. 6, 2008, 608-615

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  

Author(s) Chen, Zhongliang
Song, Qijun
Cao, Guangqun
Chen, Yanfei
Title Photolytic degradation of triclosan in the presence of surfactants
Journal name Chemical Papers
Publication date 2008
Year available 2008
Volume number 62
Issue number 6
ISSN 0366-6352
Start page 608
End page 615
Place of publication Poland
Publisher Versita
Collection year 2008
Language english
Subject 250000 Chemical Sciences
250200 Inorganic Chemistry
Abstract/Summary The formation of 2,8-dichlorodibenzo-p-dioxin (2,8-DCDD) in the photolytic degradation of triclosan has evoked a great concern for its safety and environmental fate. The photochemical behaviour of triclosan in daily-used chemical products, in which triclosan is present in relatively high concentrations and coexists with surfactants, was, however, addressed less frequently. The present work is focused on the mechanistic aspects of triclosan photodegradation in an aqueous medium with a relatively high concentration (≥ 30 mg L−1) and on the influence of pH (8.7 and 10.5) and surfactants (Triton X100, SDS, and CTMAB) on this process. The results demonstrated that photodegradation was strongly affected by the pH and the presence of surfactants. Photodegradation products, including 2,4-dichlorophenol (2,4-DCP), 5-chloro-2-(4-chlorophenoxyl)-phenol, 2,8-DCDD, dimers, trimers, and other intermediates, were identified. Based on the analysis of photoproducts, homolytic scission of ether bond, dechlorination, ring closure, and photo-polymerisation were proposed as the main routes of triclosan photodegradation.
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