Abstract
In denitrifying microbial fuel cells (MFCs), the biocathode is the electron donor and nitrate is removed in autotrophic conditions. Reduced graphene oxide modified carbon cloth (rGO-CC), polyaniline modified CC (PANI-CC), and rGO/PANI composite modified CC (rGO/PANI-CC) were prepared, and the electricity and the denitrification performances of MFCs with modified CC as cathodes were evaluated. Scanning electron microscopy analysis revealed that the carbon fibers of rGO-CC and PANI-CC were covered by lamellar rGO and reticular PANI, respectively, while PANI agglomerated on the rGO-covered carbon fibers for rGO/PANI-CC; both of which increased the specific surface area of CC. Cyclic voltammetry tests showed the rGO/PANI-CC had the highest electrochemical activity. The electricity performances of MFCs with rGO-CC, PANI-CC and rGO/PANI-CC as cathodes were improved by 82%, 24% and 41 %, and the cathodic denitrification rates were enhanced by 23%, 9% and 13%, respectively. The 16S rDNA sequencing results demonstrated the α-diversity index of electrode-attached microorganisms on modified CC decreased, and the relative abundances of Stappia and Pacacoccus increased.
| Translated title of the contribution | Effect of graphene/polyaniline composite modified cathode on performance of MFC with denitrification biocathode |
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| Original language | Chinese (Traditional) |
| Pages (from-to) | 5290-5298 |
| Number of pages | 9 |
| Journal | Zhongguo Huanjing Kexue/China Environmental Science |
| Volume | 40 |
| Issue number | 12 |
| Publication status | Published - 20 Dec 2020 |
| Externally published | Yes |