Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 17, Pages 6185-6190Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta14080f
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Funding
- Korean Institute of Geosciences and Mineral Resources [214551-01]
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In this study, a five-layer electrochemical CNT-PVDF filter that is thin, flexible, and stable is demonstrated to be effective and efficient for single-pass nitrobenzene mineralization by sequential reduction-oxidation. Key to the technology is development of a CNT-PVDF membrane that is mechanically stable, electrically conductive, and non-Faradaic, which is used to prevent CNT release from and electrochemical degradation of the Faradaic CNT electrodes. A five-layer electrochemical filter: (1) conductive & protective CNT-PVDF, (2) Faradaic CNT electrode, (3) insulating PVDF separator, (4) Faradaic CNT electrode, and (5) conductive & protective CNT-PVDF is formed by mechanical press. At a total cell potential of 4 V, the sequential electrochemical reduction-oxidation process is able to reduce >99% of the influent nitrobenzene to aniline then oxidize >80% of the aniline to non-aromatic products (mostly carbon dioxide) in a single-pass (similar to 5 s hydraulic residence time). The mineralization current efficiency is similar to 20%, total cell potential is completely (>99%) distributed to the two electrodes, and the energy requirement is similar to 36 000 kJ per mole of nitrobenzene degraded.
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