Efficient reduction of nitrobenzene to aniline with a biocatalyzed cathode

Wang, Ai-Jie, Cheng, Hao-Yi, Liang, Bin, Ren, Nan-Qi, Cui, Dan, Lin, Na, Kim, Byung Hong and Rabaey, Korneel (2011) Efficient reduction of nitrobenzene to aniline with a biocatalyzed cathode. Environmental Science and Technology, 45 23: 10186-10193. doi:10.1021/es202356w

Author Wang, Ai-Jie
Cheng, Hao-Yi
Liang, Bin
Ren, Nan-Qi
Cui, Dan
Lin, Na
Kim, Byung Hong
Rabaey, Korneel
Title Efficient reduction of nitrobenzene to aniline with a biocatalyzed cathode
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 0013-936X
Publication date 2011-12-01
Sub-type Article (original research)
DOI 10.1021/es202356w
Volume 45
Issue 23
Start page 10186
End page 10193
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2012
Language eng
Formatted abstract
Nitrobenzene (NB) is a toxic compound that is often found as a pollutant in the environment. The present removal strategies suffer from high cost or slow conversion rate. Here, we investigated the conversion of NB to aniline (AN), a less toxic endproduct that can easily be mineralized, using a fed-batch bioelectrochemical system with microbially catalyzed cathode. When a voltage of 0.5 V was applied in the presence of glucose, 88.2 ± 0.60% of the supplied NB (0.5 mM) was transformed to AN within 24 h, which was 10.25 and 2.90 times higher than an abiotic cathode and open circuit controlled experiment, respectively. AN was the only product detected during bioelectrochemical reduction of NB (maximum efficiency 98.70 ± 0.87%), whereas in abiotic conditions nitrosobenzene was observed as intermediate of NB reduction to AN (decreased efficiency to 73.75 ± 3.2%). When glucose was replaced by NaHCO3, the rate of NB degradation decreased about 10%, selective transformation of NB to AN was still achieved (98.93 ± 0.77%). Upon autoclaving the cathode electrode, nitrosobenzene was formed as an intermediate, leading to a decreased AN formation efficiency of 71.6%. Cyclic voltammetry highlighted higher peak currents as well as decreased overpotentials for NB reduction at the biocathode. 16S rRNA based analysis of the biofilm on the cathode indicated that the cathode was dominated by an Enterococcus species closely related to Enterococcus aquimarinus.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
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