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A microbial fuel cell (MFC) was used to simultaneously generate electricity and decolorize an azo dye, Methyl Orange (MO), with the decolorization rate dependent on catholyte pH.

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What they did

System
MFC

What worked

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Abstract

In this study we investigated the use of a microbial fuel cell (MFC) to abioticlly cathodic decolorization of a model azo dye, Methyl Orange (MO). Experimental results showed that electricity could be continuously generated the MO-fed MFC and MO was successfully decolorized in the cathode. The decolorization rate was highly dependent on the catholyte pH. When pH was varied from 3.0 to 9.0, the k value in relation to MO degradation decreased from 0.298 to 0.016 μmol min -1 , and the maximum power density decreased from 34.77 to 1.51 mW m -2 . Sulfanilic acid and N,N-dimethyl-p-phenylenediamine were identified as the decolorization products of MO by HPLC-MS.

Key findings

  • Electricity can be continuously generated in an MO-fed MFC.
  • MO was successfully decolorized in the cathode.
  • Decolorization rate and maximum power density decreased with increasing catholyte pH.

Keywords

Microbial fuel cellSulfanilic acidElectrochemistryCathodeNuclear chemistryDegradation (telecommunications)

Identifiers

DOI
10.4028/www.scientific.net/amm.291-294.602
Journal
Applied Mechanics and Materials
Year
2013