کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
582475 1453164 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reductive destruction and decontamination of aqueous solutions of chlorinated antimicrobial agent using bimetallic systems
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Reductive destruction and decontamination of aqueous solutions of chlorinated antimicrobial agent using bimetallic systems
چکیده انگلیسی
Palladium, ruthenium and silver were investigated as catalysts for the dechlorination of dichlorophen (DCP, 2,2′-methylenebis(4-chlorophenol)), an antimicrobial 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 Fe0 (40 g L−1). Along with micrometric Fe0, five Fe0-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 kobs was about (3.98 ± 0.10) × 10−2 min−1, the calculated half-life t1/2 about 17.4 ± 0.9 min and a t50 about 10.1 ± 0.5 min. A DCP degradation pathway map was also proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 164, Issues 2–3, 30 May 2009, Pages 665-674
نویسندگان
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