Electrochemical carbon nanotube filter for adsorption, desorption, and oxidation of aqueous dyes and anions

  • Vecitis C
  • Gao G
  • Liu H
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Abstract

An electrochemically active multiwalled carbon nanotube (MWNT) filter
is observed to be effective toward the adsorptive removal and electrochemical
oxidation of the aqueous dyes, methylene blue and methyl orange,
and the oxidation of the aqueous anions, chloride and iodide. In
the absence of electrochemistry, the MWNT filter completely removed
all dye from the influent solution until a near monolayer of dye
molecules adsorbed to the MWNT filter surface. Electrochemical filtration
at 2 V resulted in >98% oxidation of the influent dye during a single
pass through the 41 μm thin porous MWNT network with a ?1.2 s residence
time. The electrochemical MWNT filter was also able to oxidize aqueous
chloride and iodide with minimal overpotential. However, the oxidation
of these anions was limited by the number of electrochemically active
MWNT surface sites. These results show the potential of an electrochemical
MWNT filter for the adsorptive removal and oxidative degradation
of aqueous contaminants. © 2011 American Chemical Society.

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Authors

  • Chad D. Vecitis

  • Guandao Gao

  • Han Liu

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