Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 16, Pages 6354-6360Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.03.062
Keywords
Triclosan; Pd/nFe; Laccase; 2-Phenoxyphenol; Redox process
Funding
- Korea Ministry of Environment
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In this study, a sequential reduction-oxidation method was developed for complete degradation of triclosan (2,4,4'-trichloro-2'-hydroxydiphenyl ether, TCS) in aqueous solution. Rapid reductive dechlorination of TCS was achieved with palladized zero-valent iron nanoparticles (Pd/nFe), under anaerobic conditions, with generation of 2-phenoxyphenol as the sole dechlorination product. Sequentially, 2-phenoxyphenol was transformed into a non-toxic polymer using laccase (EC:1.10.3.2) derived from Trametes versicolor in the presence of natural redox mediator syringaldehyde (SYD). High performance liquid chromatography combined with electrospray ionization mass spectroscopy (HPLC-ESI-MS) revealed the formation of dimer and trimer products during the laccase-mediated transformation process. The efficiency of the integrated method is critically dependent on the Fe2+ concentration, which was effectively controlled by optimizing the solution pH. To the best of our knowledge, this is the first report of a redox two-step hybrid system for the complete transformation of TCS into non-toxic products. (C) 2010 Elsevier Ltd. All rights reserved.
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