Bioanodes/biocathodes formed at optimal potentials enhance subsequent pentachlorophenol degradation and power generation from microbial fuel cells

Liping Huang, Qiang Wang, Xie Quan, Yaxuan Liu, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

45 Citations (Scopus)

Abstract

Bioanodes formed at an optimal potential of 200. mV vs. SHE and biocathodes developed at -. 300. mV vs. SHE in bioelectrochemical cells (BECs) enhanced the subsequent performances of microbial fuel cells (MFCs) compared to the un-treated controls. While the startup times were reduced to 320. h (bioanodes) and 420-440. h (biocathodes), PCP degradation rates were improved by 28.5% (bioanodes) and 21.5% (biocathodes), and power production by 41.7% (bioanodes) and 44% (biocathodes). Accordingly, there were less accumulated products of PCP de-chlorination in the biocathodes whereas PCP in the bioanodes was more efficiently de-chlorinated, resulting in the formation of a new product of 3,4,5-trichlorophenol (24.3. ±. 2.2. μM at 96. h). Charges were diverted to more generation of electricity in the bioanodes at 200. mV while oxygen in the biocathodes at -. 300. mV acted as a primary electron acceptor. Dominant bacteria known as recalcitrant organic degraders and/or exoelectrogens/electrotrophs included Desulfovibrio carbinoliphilus and Dechlorospirillum sp. on the bioanodes at 200. mV, and Desulfovibrio marrakechensis, Comamonas testosteroni and Comamonas sp. on the biocathodes at -. 300. mV. These results demonstrated that an optimal potential was a feasible approach for developing both bioanodes and biocathodes for efficient PCP degradation and power generation from MFCs.
Original languageEnglish
Pages (from-to)13-22
Number of pages10
JournalBioelectrochemistry
Volume94
DOIs
Publication statusPublished - 1 Dec 2013
Externally publishedYes

Keywords

  • Bioanode
  • Biocathode
  • Bioelectrochemical cell
  • Microbial fuel cell
  • Pentachlorophenol

ASJC Scopus subject areas

  • Biophysics
  • Physical and Theoretical Chemistry
  • Electrochemistry

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