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Efficient production of acetate from inorganic carbon (HCO3) in microbial electrosynthesis systems incorporating Ag3PO4/g-C3N4 anaerobic photo-assisted biocathodes

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journal contribution
posted on 05.01.2021, 14:52 by Weifeng Kong, Liping Huang, Xie Quan, Zongbin Zhao, Gianluca Li-PumaGianluca Li-Puma
The efficient production of acetate from HCO3 by the nonphotosynthetic bacterium Serratia marcescens Q1 is demonstrated in an anaerobic, photo-assisted, microbial electrosynthesis (MES) system incorporating a Ag3PO4/g-C3N4 biocathode. The Ag3PO4/g-C3N4 formed a Z-scheme photocatalytic heterojunction structure with enhanced redox capacity. The photocorrosion of Ag3PO4 was inhibited by the production of H2O2 in-situ, through water oxidation driven by the photogenerated holes on the Ag3PO4 valence band. The photoinduced electrons on the conduction band of g-C3N4 instead produced H2, which was metabolized by the Q1 electrotroph with HCO3 to produce acetate at a rate of 5.4 mM/d with a CEacetate of 93 % at a current density of 3.3 A/m2. The MES accumulated up to 81.0 mM with a CEacetate of 89 % over 16 days continuous operation. This study provides a sustainable and feasible strategy for inhibiting the photocorrosion of Ag3PO4 and thus achieve efficient acetate production from HCO3 in photo-assisted MESs biocathodes.

Funding

National Natural Science Foundation of China (Nos. 21777017 and 52070032)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Applied Catalysis B: Environmental

Volume

284

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Applied Catalysis B: Environmental and the definitive published version is available at https://doi.org/10.1016/j.apcatb.2020.119696.

Acceptance date

24/10/2020

Publication date

2020-11-20

Copyright date

2020

ISSN

0926-3373

Language

en

Depositor

Prof Gianluca Li Puma. Deposit date: 3 January 2021

Article number

119696