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Efficient reduction of nitrobenzene to aniline with a biocatalyzed cathode

(2011) ENVIRONMENTAL SCIENCE & TECHNOLOGY. 45(23). p.10186-10193
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Biotechnology for a sustainable economy (Bio-Economy)
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 NaHCO(3), 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.
Keywords
MICROBIAL FUEL-CELLS, ELECTROCHEMICAL REDUCTION, NITROAROMATIC COMPOUNDS, ENTEROCOCCUS-GALLINARUM, STREPTOCOCCUS-FAECALIS, ELECTRICITY-GENERATION, ELECTRODE, NITROREDUCTASES, TRICHLOROETHENE, DECHLORINATION

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Citation

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Chicago
Wang, Ai-Jie, Hao-Yi Cheng, Bin Liang, Nan-Qi Ren, Dan Cui, Na Lin, Byung Hong Kim, and Korneel Rabaey. 2011. “Efficient Reduction of Nitrobenzene to Aniline with a Biocatalyzed Cathode.” Environmental Science & Technology 45 (23): 10186–10193.
APA
Wang, A.-J., Cheng, H.-Y., Liang, B., Ren, N.-Q., Cui, D., Lin, N., Kim, B. H., et al. (2011). Efficient reduction of nitrobenzene to aniline with a biocatalyzed cathode. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 45(23), 10186–10193.
Vancouver
1.
Wang A-J, Cheng H-Y, Liang B, Ren N-Q, Cui D, Lin N, et al. Efficient reduction of nitrobenzene to aniline with a biocatalyzed cathode. ENVIRONMENTAL SCIENCE & TECHNOLOGY. 2011;45(23):10186–93.
MLA
Wang, Ai-Jie, Hao-Yi Cheng, Bin Liang, et al. “Efficient Reduction of Nitrobenzene to Aniline with a Biocatalyzed Cathode.” ENVIRONMENTAL SCIENCE & TECHNOLOGY 45.23 (2011): 10186–10193. Print.
@article{1973116,
  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 NaHCO(3), 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.},
  author       = {Wang, Ai-Jie and Cheng, Hao-Yi and Liang, Bin and Ren, Nan-Qi and Cui, Dan and Lin, Na and Kim, Byung Hong and Rabaey, Korneel},
  issn         = {0013-936X},
  journal      = {ENVIRONMENTAL SCIENCE \& TECHNOLOGY},
  keyword      = {MICROBIAL FUEL-CELLS,ELECTROCHEMICAL REDUCTION,NITROAROMATIC COMPOUNDS,ENTEROCOCCUS-GALLINARUM,STREPTOCOCCUS-FAECALIS,ELECTRICITY-GENERATION,ELECTRODE,NITROREDUCTASES,TRICHLOROETHENE,DECHLORINATION},
  language     = {eng},
  number       = {23},
  pages        = {10186--10193},
  title        = {Efficient reduction of nitrobenzene to aniline with a biocatalyzed cathode},
  url          = {http://dx.doi.org/10.1021/es202356w},
  volume       = {45},
  year         = {2011},
}

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