Biofouling-focused assessment of a novel, cellulose-based ionogel membrane applied in a microbial fuel cell

Szakács, Szabolcs and Martínez, Eduardo Ortega and Koók, László and Santos, Gabriela Medeiros and Alarcon, Javiera Toledo and Jeison, David and Pientka, Zbynek and Nemestóthy, Nándor and Bélafiné Bakó, Katalin and Bakonyi, Péter (2024) Biofouling-focused assessment of a novel, cellulose-based ionogel membrane applied in a microbial fuel cell. BIORESOURCE TECHNOLOGY REPORTS, 26. No. 101817. ISSN 2589-014X

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Abstract

In this work, a novel ionogel membrane was prepared on polyethersulfone physical support from the mixture of microcrystalline cellulose and [BMIM][Cl] (1-Butyl-3-methylimidazolium chloride) ionic liquid and used in a microbial fuel cell (MFC). The ionogel membrane was characterized in terms of its morphology, mass- (substrate, oxygen) and ion transfer features and compared to Nafion 115. The membranes were deployed in acetate-fed two-chamber MFC, where the MFC equipped with the ionogel membrane showed a Coulombic efficiency and peak current density of 49.4 % and 369 mA m− 2 , respectively. Through three weeks of experiments, the electrode and membrane biofouling layers were studied by 16S amplicon metagenomics and correspondence analysis. It turned out that a cellulose-degrading species, Clostridium termitidis was present with a relatively large, 23.2 % relative abundance on the surface of the ionogel membrane, which may have caused its deterioration and the consequent colonization of the cathodic compartment.

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