Impact of extended starvation conditions on bioelectrocatalytic activity of a methane-producing microbial electrolysis cell.

Autor: Cristiani L; Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy., Zeppilli M; Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy., Brutti S; Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy., Puig S; LEQUiA, Institute of the Environment, University of Girona, C/ Maria Aurèlia Capmany, 69, E-17003, Girona, Spain., Salvatori G; Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy., Petrangeli Papini M; Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy., Villano M; Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy. Electronic address: marianna.villano@uniroma1.it.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2024 Dec; Vol. 413, pp. 131491. Date of Electronic Publication: 2024 Sep 15.
DOI: 10.1016/j.biortech.2024.131491
Abstrakt: The performance of a methane-producing microbial electrolysis cell (MEC) markedly relies on the activity and resilience of its electroactive anodic biofilm. Here, the capability of an MEC anodic biofilm to recover following extended starvation periods (90 days) and to function under different applied anode potentials (i.e., +0.20 and -0.10 V, vs. Standard Hydrogen Electrode-SHE) was investigated. Cyclic voltammetry proved to be an insightful means to characterize the biofilm electrocatalytic activity and to track the dynamics of biofilm reactivation. Under all tested conditions the anodic biofilm rapidly and completely recovered from starvation in less than 144 h. However, starvation reduced the electron transfer redundancy of the biofilm causing the disappearance of redox sites operating at the more positive potentials (around 0.0 V vs. SHE) and retaining those having a formal potential lower than -0.18 V vs. SHE. This study presents compelling evidence for the resilience and efficiency of methane-producing MEC.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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