Visible-light-enhanced Cr (VI) reduction and bioelectricity generation at MXene photocathode in photoelectrocatalytic microbial fuel cells

Qi YANG, Xin BAO, Ziying LI, Aijiang YANG, Yang CAO, Xia HU, Lanlan YU, Baojun LIU

Research output: Contribution to journalArticlespeer-review

Abstract

Photocatalysis coupled with microbial fuel cell (Photo-MFC) is a promising technology that can be applied for reducing pollutants (e.g. hexavalent chromium (Cr (VI)) while generating power with wastewater by photocathode under visible light. However, exploring effective and inexpensive catalysts for enhancing the photocathode performance is a challenge in a Photo-MFC system. Herein, ultrathin MXenes (Ti3C2) nanosheets were fabricated through ultrasonic etching of Ti3AlC2 for photocathode catalysts, and the reduction of Cr (VI) was also investigated by MXenes-modified photocathode under visible light. The result shows that the efficiency for the Cr (VI) reduction is approximately 72.84% in 72 h, and higher than that under dark condition (63.77%) or the one without MXenes cathode (60.45%). The maximum power density of Photo-MFC with MXenes-modified photocathode under visible light is 702.67 mW·m−2, which is higher 41.95% than that in the traditional MFC without MXenes cathode (495.02 mW·m−2). In addition, with initial concentration of 40 mg/L at pH 3, the Cr (VI) reduction efficiency of Photo-MFC could be as high as 100% after treating for 60 h under visible light. This study provides a train of thought for removing Cr (VI) pollution in the water environment. Copyright © 2021 Published by Elsevier Ltd.

Original languageEnglish
Article number102454
JournalJournal of Water Process Engineering
Volume45
Early online dateDec 2021
DOIs
Publication statusE-pub ahead of print - Dec 2021

Citation

Yang, Q., Bao, X., Li, Z., Yang, A., Cao, Y., Hu, X., . . . Liu, B. (2022). Visible-light-enhanced Cr (VI) reduction and bioelectricity generation at MXene photocathode in photoelectrocatalytic microbial fuel cells. Journal of Water Process Engineering, 45. Retrieved from https://doi.org/10.1016/j.jwpe.2021.102454

Keywords

  • MXene materials
  • Photocatalysts
  • MFC
  • Hexavalent chromium
  • PG student publication

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