期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 164, 期 2-3, 页码 665-674出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2008.08.048
关键词
Bimetallic system; Dechlorination; Dichlorophen; HPLC/MS; Zero valent iron
资金
- Lebanese National Council for Scientific Research
- American University of Beirut [522316, 888113]
Palladium, ruthenium and silver were investigated as catalysts for the dechlorination of dichlorophen (DCP, 2,2'-methylenebis(4-chlotophenol)), an anti microbial and anthelmintic agent largely used as algicide, fungicide and bactericide. Experiments were undertaken under oxic and anoxic conditions for experimental durations up to 180 min (3 h). The anoxic conditions were achieved by purging the solutions with nitrogen gas. Reactions were performed in a 12 +/- 0.5 mg L-1 DCP solution (V = 20 mL) using 0.8 g of Fe-0 (40 g L-1). Along with micrometric Fe-0, five Fe-0-plated systems were investigated: Pd (1%). Ru (0.01%), Ru (0.1%), Ru (1%) and Ag (1%). Metal plating was controlled by atomic absorption spectroscopy. DCP degradation was monitored using: (i) two HPLC devices, (ii) ion chromatography. (iii) UV and fluorescence spectrophotometry. Results indicated: (i) total dechlorination with Fe/Pd, (ii) partial dechlorination (40%) with Fe/Ru, and no reaction with Fe/Ag. DCP is vanished completely after 90 min of contact with Fe/Pd following a first order kinetic. The observed degradation rate k(obs) was about (3.98 +/- 0.10) x 10(-2) min(-1), the calculated half-life t(1/2) about 17.4 +/- 10.9 min and a t(50) about 10.1 +/- 0.5 min. A DCP degradation pathway map was also proposed. (c) 2008 Elsevier B.V. All rights reserved.
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