Decolorization of azo dyes in bioelectrochemical systems

Mu, Yang, Rabaey, Korneel, Rozendal, Rene A., Yuan, Zhiguo and Keller, Jurg (2009) Decolorization of azo dyes in bioelectrochemical systems. Environmental Science and Technology, 43 13: 5137-5143. doi:10.1021/es900057f


Author Mu, Yang
Rabaey, Korneel
Rozendal, Rene A.
Yuan, Zhiguo
Keller, Jurg
Title Decolorization of azo dyes in bioelectrochemical systems
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 0013-936X
Publication date 2009-07
Year available 2009
Sub-type Article (original research)
DOI 10.1021/es900057f
Volume 43
Issue 13
Start page 5137
End page 5143
Total pages 7
Editor Jerald Schnoor
Place of publication Washington, D.C., U.S.
Publisher American Chemical Society
Collection year 2010
Language eng
Subject C1
Abstract Azo dyes are ubiquitously used in the textile industry. These dyes need to be removed from the effluent prior to discharge to sewage due to their intense color and toxicity. In this study we investigated the use of a bioelectrochemical system (BES) to abioticlly cathodic decolorization of a model azo dye, Acid Orange 7 (AO7), where the process was driven by microbial oxidation of acetate at the anode. Effective decolorization of AO7 at rates up to 2.64 ± 0.03 mol m−3 NCC d−1 (net cathodic compartment, NCC) was achieved at the cathode, with concomitant energy recovery. The AO7 decolorization rate was significantly enhanced when the BES was supplied with power, reaching 13.18 ± 0.05 mol m−3 NCC d−1 at an energy consumption 0.012 ± 0.001 kWh mol−1 AO7 (at a controlled cathode potential of −400 mV vs SHE). Compared with conventional anaerobic biological methods, the required dosage of organic cosubstrate was significantly reduced in the BES. A possible cathodic reaction mechanism for the decolorization of AO7 is suggested based on the decolorization products identified: the azo bond of AO7 was cleaved at the cathode, resulting in the formation of the colorless sulfanilic acid and 1-amino-2-naphthol.
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Advanced Water Management Centre Publications
 
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Created: Thu, 03 Sep 2009, 07:48:03 EST by Mr Andrew Martlew on behalf of Advanced Water Management Centre