Format

Send to

Choose Destination
Water Res. 2016 Dec 1;106:339-343. doi: 10.1016/j.watres.2016.10.018. Epub 2016 Oct 8.

Electrochemical reduction of carbon dioxide to formate with Fe-C electrodes in anaerobic sludge digestion process.

Author information

1
Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, PR China.
2
Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, PR China. Electronic address: zhangyb@dlut.edu.cn.

Abstract

Electrochemical reduction of carbon dioxide (CO2) to useful chemicals is an attractive strategy to cut its emission in atmosphere. However, high overpotential and energy consumption required in the electrochemical reduction are the major barriers of this process. In this study, a new CO2 reduction technique for production of formic acid was proposed from waste activated sludge digestion in a microbial electrosynthesis system (MES) with iron plate and carbon pillar as the electrodes. Compared with other reactors, methane production of the Fe-C MES reactor was slightly lower and CO2 was undetectable. Instead, considerable formate (672.3 mg/L) and H2 (45.8 mL) were produced in this Fe-C MES reactor, but not found in the other reactors. It should be ascribed to the reduction of CO2 and H+ at cathode. The reduction of H+ resulted in a weak alkaline pH (9.3), which made the methanogenesis slightly lower in Fe-C MES.

KEYWORDS:

CO(2) reduction; Clean energy; Formate production; Hydrogen production; MES

PMID:
27750122
DOI:
10.1016/j.watres.2016.10.018
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center