Unbound MEDLINE

Electrocatalytic reduction of nitrate ions from water using polyaniline nanofibers modified gold electrode.

Abstract

Polyaniline (PANI) nanofibers were electrochemically synthesized on gold electrode using ethanol as soft template by the cyclic voltammetry technique. The PANI nanofibers were characterized by Fourier transform infrared spectroscopy, UV-visible spectroscopy, and scanning electron microscopy. Linear sweep voltammetry was used to investigate electrocatalytic activity of the PANI nanofibers modified electrode toward the reduction of nitrate ions. Results showed that the electroreduction process strongly depends on the applied potential. At the potential value of about -0.8 V vs Ag/AgCl, the electroreduction of nitrate anions to nitrite anions was identified as the rate-determining step of the electroreduction process. In the potential range of -0.8 to -1.0 V, reduction of nitrite to hydroxylamine occurs, followed by the reduction to ammonia. At potentials more negative than -1.0 V, nitrite is directly reduced to ammonia. This study demonstrates the effectiveness of PANI nanofibers modified electrode in the electroreduction of nitrate ions compared to traditional reduction methods.

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  • Publisher Full Text
  • Authors

    Olad A, Farshi F, Ettehadi J

    Source

    Water environment research : a research publication of the Water Environment Federation 84:2 2012 Feb pg 144-9

    MeSH

    Aniline Compounds
    Catalysis
    Electrochemical Techniques
    Electrodes
    Gold
    Microscopy, Electron, Scanning
    Nanofibers
    Nitrates
    Time Factors
    Water Pollutants, Chemical

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    22515064