Unified photoelectrocatalytic microbial fuel cell harnessing 3D binder-free photocathode for simultaneous power generation and dual pollutant removal

Jing Zhang, Zongwu Wang, Liangliang Chu, Ruyan Chen, Chunyan Zhang, Sam Toan, David M. Bagley, Jianhui Sun, Shuying Dong, Maohong Fan

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A combined photoelectrocatalytic microbial fuel cell (photo-MFC) with BiOCl/reduced graphene oxide aerogel (BGA) photocathode is constructed for simultaneous power generation and dual pollutant removal. Owing to the lower cathodic internal resistance and enhanced reaction rate under light irradiation, the BGA photo-MFC exhibits excellent power generation capacity (696.51 ± 5.27 mV and 7.33 ± 0.23 W m−3) in comparison with the single MFC process (455.36 ± 7.18 mV and 1.88 ± 0.09 W m−3). Meanwhile, the removal efficiency of oxytetracycline (OTC) in the anode rises to 98.93 ± 0.15% after four days of operation, and the biotoxicity of OTC effluent to Escherichia coli DH5α is largely eliminated. At the cathode, 97.28 ± 0.64% of 40 mg L−1 methyl orange (MO) can be degraded with the highest kinetic constant of 0.304 h−1 at the optimal pH of 3. High-throughput sequencing analysis reveals that the Geobacter are enriched and responsible for the enhanced power generation of the BGA photo-MFC. The synergistic effects of photocatalysis and MFC in BGA photo-MFC dramatically increase the removal of OTC and MO in their respective chambers while producing energy in situ to drive the process without additional energy consumption, and exhibit extensive application prospects for actual wastewater treatment.

Original languageEnglish (US)
Article number229133
JournalJournal of Power Sources
Volume481
DOIs
StatePublished - Jan 1 2021
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the NSFC (Grants No. 21677047 and 51808199), the China Postdoctoral Science Foundation (Grant No. 2018M630825 and 2019T120624). The authors also appreciate for the support from the Fund for Excellent Young Scholars (20180545) of Henan Normal University for the PhD, Nature Science Foundation of Henan province (182300410153).

Funding Information:
This work was supported by the NSFC (Grants No. 21677047 and 51808199 ), the China Postdoctoral Science Foundation (Grant No. 2018M630825 and 2019T120624 ). The authors also appreciate for the support from the Fund for Excellent Young Scholars ( 20180545 ) of Henan Normal University for the PhD, Nature Science Foundation of Henan province ( 182300410153 ).

Publisher Copyright:
© 2020

Keywords

  • BiOCl/reduced graphene oxide aerogel
  • Methyl orange
  • Oxytetracycline
  • Photoelectrocatalytic microbial fuel cell
  • Power generation

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