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Redox mediator as cathode modifier for enhanced degradation of azo dye in a sequential dual chamber microbial fuel cell-aerobic treatment process

journal contribution
posted on 01.11.2021, 09:30 by Mohammad Danish Khan, Ravikumar Thimmappa, Abdul Hakeem Anwer, Nishat Khan, Shamas Tabraiz, Da Li, Mohammad Zain Khan, Eileen YuEileen Yu
The electron transfer from cathode to azo dye Acid Blue 29 (AB29) using thionine (TH) and anthraquinone-2-sulfonate (AQS) redox mediators were investigated in dual chamber microbial fuel cells (DCMFCs). More than 90% of color was removed using electropolymerized TH (192 h) and AQS (264 h) cathodes. Chemical oxygen demand (COD) removal after anaerobic treatment in cathode chamber of TH-MFC, AQS-MFC and unmodified-MFC were 76.6 ± 1.7, 70.8 ± 2.5 and 18.3 ± 2.9%, respectively, which increased to 85.4 ± 1.5, 79.8 ± 3 and 20.6 ± 2.1%, respectively, after aerobic post treatment. Gas chromatography–mass spectrometry (GC–MS) investigations revealed the formation of aromatic amines in DCMFCs which were further degraded into low molecular-weight products in the aerobic post treatment. Electrochemical impedance spectroscopic (EIS) analysis showed lowest charge transfer resistance of TH-cathode which increased the electrochemical reactions and electron transfer rates. These results indicated that AB29 can be efficiently degraded by utilizing modified cathode based DCMFC-aerobic post treatment process along with bioelectricity generation.

Funding

Commonwealth Scholarship Commission, United Kingdom, NERC (NE/L01422X/1)

Liquid Fuel and bioEnergy Supply from CO2 Reduction

Engineering and Physical Sciences Research Council

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History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

International Journal of Hydrogen Energy

Volume

46

Issue

79

Pages

39427-39437

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Hydrogen Energy Publications

Publisher statement

This paper was accepted for publication in the journal International Journal of Hydrogen Energy and the definitive published version is available at https://doi.org/10.1016/j.ijhydene.2021.09.151

Acceptance date

18/09/2021

Publication date

2021-10-09

Copyright date

2021

ISSN

0360-3199

Language

en

Depositor

Prof Eileen Yu. Deposit date: 30 October 2021