Electrochemical synthesis of propionic acid from reduction of ethanol and carbon dioxide at various applied potentials

Chatterjee, Pritha (2023) Electrochemical synthesis of propionic acid from reduction of ethanol and carbon dioxide at various applied potentials. Biochemical Engineering Journal, 194. p. 108896. ISSN 1369-703X

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Abstract

The synthesis of value-added compounds other than acetate at high rates while utilizing cheap electrode materials is one of the current difficulties faced in microbial electrosynthesis. The present study investigated the production of higher chain volatile fatty acids from the reduction of ethanol and CO2 using unmodified carbon felt at different negative cathode potentials viz. −0.8, −1.0 and −1.2 V vs Ag/AgCl. Propionic acid was produced as secondary main product after acetic acid. The applied voltage of −1.2 V reported the highest amount of acetic acid with production rates of 949 mg L−1 d−1 (15.81 mM d−1). The increased cathode potential from −0.8 to − 1.2 V enhanced the maximum acetic acid production. The maximum acetic acid production achieved at a voltage of −1.2 V was 1.72 and 1.17 folds higher than MES operation at −0.8 and −1.0 V, respectively. Highest amount of propionic acid with the production rates of 322 mg L−1 d−1 (4.34 mM d−1) was obtained at −1.0 V, which was 1.20 and 2.12 times higher than the MES operation at −0.8 and −1.2 V, respectively. Scanning electron microscopy revealed dense biofilm and strong attachment of diverse microorganisms on the biocathode.

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IITH Creators:

IITH Creators	ORCiD
Chatterjee, Pritha	UNSPECIFIED

Item Type:

Article

Uncontrolled Keywords:

Acetic acid; CO2 reduction; Ethanol; Imposed potential; Microbial electrosynthesis; Propionic acid; Acetic acid; Carbon dioxide; Cathodes; Ethanol; pH; Reduction; Scanning electron microscopy; Volatile fatty acids; acetic acid; alcohol; carbon dioxide; propionic acid; volatile fatty acid; % reductions; Acetic acid productions; Applied potentials; Cathode potential; CO 2 reduction; Electrochemical synthesis; High rate; Imposed potentials; Microbial electrosynthesis; Production rates; Article; biofilm; electric potential; electrochemistry; electrosynthesis; nonhuman; scanning electron microscopy; Propionic acid

Subjects:

Chemistry > Electrochemistry
Chemistry
Civil Engineering

Divisions:

Department of Civil Engineering

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

26 Sep 2023 11:05

Last Modified:

26 Sep 2023 11:05

URI:

http://raiithold.iith.ac.in/id/eprint/11700