Complete Reduction of Polychlorinated Biphenyls by Acid-Etched Steel Wool in Supercritical Carbon Dioxide

Inexpensive household steel wool was used as a reducing agent for the reductive dechlorination of polychlorinated biphenyls (PCBs) in supercritical carbon dioxide (scCO2). Untreated steel wool does not produce significant results. Steel wool treated with 6 N HCl, however, showed complete reduction o...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2012-05, Vol.51 (19), p.6625-6630
Main Authors: Chen, Yun-Chieh, Liao, Weisheng, Yak, Hwa-Kwang
Format: Article
Language:English
Subjects:
Applied sciences
Carbon dioxide
Chemical engineering
Etching
Exact sciences and technology
Hydrodechlorination
Nanostructure
Polychlorinated biphenyls
Reduction
Scanning electron microscopy
Steel wool
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Summary:Inexpensive household steel wool was used as a reducing agent for the reductive dechlorination of polychlorinated biphenyls (PCBs) in supercritical carbon dioxide (scCO2). Untreated steel wool does not produce significant results. Steel wool treated with 6 N HCl, however, showed complete reduction of the PCBs (Aroclor 1254) used. Scanning electron microscopy (SEM) reveals the formation of nanoscale pits (nanopits) on the surface of steel wool after etching with HCl. These nanopits are responsible for the high efficiency of the hydrodechlorination process.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie300590j