Iron Oxide–Modified Carbon Electrode and Sulfate-Reducing Bacteria for Simultaneous Enhanced Electricity Generation and Tannery Wastewater Treatment

The microbial fuel cell (MFC) is emerging as a potential technology for extracting energy from wastes/wastewater while they are treated. The major hindrance in MFC commercialization is lower power generation due to the sluggish transfer of electrons from the biocatalyst (bacteria) to the anode surfa...

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Autores principales:	Faiz Miran, Muhammad Waseem Mumtaz, Hamid Mukhtar, Sadia Akram
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	microbial fuel cell tannery wastewater treatment sulfate-reducing bacteria iron nanoparticles (Fe NPs) electricity generation Biotechnology TP248.13-248.65
Acceso en línea:	https://doaj.org/article/be6126c0f0bd48d9b8f067b8e850aa4f
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spelling	oai:doaj.org-article:be6126c0f0bd48d9b8f067b8e850aa4f2021-11-12T05:10:46ZIron Oxide–Modified Carbon Electrode and Sulfate-Reducing Bacteria for Simultaneous Enhanced Electricity Generation and Tannery Wastewater Treatment2296-418510.3389/fbioe.2021.747434https://doaj.org/article/be6126c0f0bd48d9b8f067b8e850aa4f2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fbioe.2021.747434/fullhttps://doaj.org/toc/2296-4185The microbial fuel cell (MFC) is emerging as a potential technology for extracting energy from wastes/wastewater while they are treated. The major hindrance in MFC commercialization is lower power generation due to the sluggish transfer of electrons from the biocatalyst (bacteria) to the anode surface and inefficient microbial consortia for treating real complex wastewater. To overcome these concerns, a traditional carbon felt (CF) electrode modification was carried out by iron oxide (Fe3O4) nanoparticles via facile dip-and-dry methods, and mixed sulfate-reducing bacteria (SRBs) were utilized as efficient microbial consortia. In the modified CF electrode with SRBs, a considerable improvement in the bioelectrochemical operation was observed, where the power density (309 ± 13 mW/m2) was 1.86 times higher than bare CF with SRBs (166 ± 11 mW/m2), suggesting better bioelectrochemical performance of an SRB-enriched Fe3O4@CF anode in the MFC. This superior activity can be assigned to the lower charge transfer resistance, higher conductance, and increased number of catalytic sites of the Fe3O4@CF electrode. The SRB-enriched Fe3O4@CF anode also assists in enhancing MFC performance in terms of COD removal (>75%), indicating efficient biodegradability of tannery wastewater and a higher electron transfer rate from SRBs to the conductive anode. These findings demonstrate that a combination of the favorable properties of nanocomposites such as Fe3O4@CF anodes and efficient microbes for treating complex wastes can encourage new directions for renewable energy–related applications.Faiz MiranMuhammad Waseem MumtazHamid MukhtarSadia AkramFrontiers Media S.A.articlemicrobial fuel celltannery wastewater treatmentsulfate-reducing bacteriairon nanoparticles (Fe NPs)electricity generationBiotechnologyTP248.13-248.65ENFrontiers in Bioengineering and Biotechnology, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	microbial fuel cell tannery wastewater treatment sulfate-reducing bacteria iron nanoparticles (Fe NPs) electricity generation Biotechnology TP248.13-248.65
spellingShingle	microbial fuel cell tannery wastewater treatment sulfate-reducing bacteria iron nanoparticles (Fe NPs) electricity generation Biotechnology TP248.13-248.65 Faiz Miran Muhammad Waseem Mumtaz Hamid Mukhtar Sadia Akram Iron Oxide–Modified Carbon Electrode and Sulfate-Reducing Bacteria for Simultaneous Enhanced Electricity Generation and Tannery Wastewater Treatment
description	The microbial fuel cell (MFC) is emerging as a potential technology for extracting energy from wastes/wastewater while they are treated. The major hindrance in MFC commercialization is lower power generation due to the sluggish transfer of electrons from the biocatalyst (bacteria) to the anode surface and inefficient microbial consortia for treating real complex wastewater. To overcome these concerns, a traditional carbon felt (CF) electrode modification was carried out by iron oxide (Fe3O4) nanoparticles via facile dip-and-dry methods, and mixed sulfate-reducing bacteria (SRBs) were utilized as efficient microbial consortia. In the modified CF electrode with SRBs, a considerable improvement in the bioelectrochemical operation was observed, where the power density (309 ± 13 mW/m2) was 1.86 times higher than bare CF with SRBs (166 ± 11 mW/m2), suggesting better bioelectrochemical performance of an SRB-enriched Fe3O4@CF anode in the MFC. This superior activity can be assigned to the lower charge transfer resistance, higher conductance, and increased number of catalytic sites of the Fe3O4@CF electrode. The SRB-enriched Fe3O4@CF anode also assists in enhancing MFC performance in terms of COD removal (>75%), indicating efficient biodegradability of tannery wastewater and a higher electron transfer rate from SRBs to the conductive anode. These findings demonstrate that a combination of the favorable properties of nanocomposites such as Fe3O4@CF anodes and efficient microbes for treating complex wastes can encourage new directions for renewable energy–related applications.
format	article
author	Faiz Miran Muhammad Waseem Mumtaz Hamid Mukhtar Sadia Akram
author_facet	Faiz Miran Muhammad Waseem Mumtaz Hamid Mukhtar Sadia Akram
author_sort	Faiz Miran
title	Iron Oxide–Modified Carbon Electrode and Sulfate-Reducing Bacteria for Simultaneous Enhanced Electricity Generation and Tannery Wastewater Treatment
title_short	Iron Oxide–Modified Carbon Electrode and Sulfate-Reducing Bacteria for Simultaneous Enhanced Electricity Generation and Tannery Wastewater Treatment
title_full	Iron Oxide–Modified Carbon Electrode and Sulfate-Reducing Bacteria for Simultaneous Enhanced Electricity Generation and Tannery Wastewater Treatment
title_fullStr	Iron Oxide–Modified Carbon Electrode and Sulfate-Reducing Bacteria for Simultaneous Enhanced Electricity Generation and Tannery Wastewater Treatment
title_full_unstemmed	Iron Oxide–Modified Carbon Electrode and Sulfate-Reducing Bacteria for Simultaneous Enhanced Electricity Generation and Tannery Wastewater Treatment
title_sort	iron oxide–modified carbon electrode and sulfate-reducing bacteria for simultaneous enhanced electricity generation and tannery wastewater treatment
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/be6126c0f0bd48d9b8f067b8e850aa4f
work_keys_str_mv	AT faizmiran ironoxidemodifiedcarbonelectrodeandsulfatereducingbacteriaforsimultaneousenhancedelectricitygenerationandtannerywastewatertreatment AT muhammadwaseemmumtaz ironoxidemodifiedcarbonelectrodeandsulfatereducingbacteriaforsimultaneousenhancedelectricitygenerationandtannerywastewatertreatment AT hamidmukhtar ironoxidemodifiedcarbonelectrodeandsulfatereducingbacteriaforsimultaneousenhancedelectricitygenerationandtannerywastewatertreatment AT sadiaakram ironoxidemodifiedcarbonelectrodeandsulfatereducingbacteriaforsimultaneousenhancedelectricitygenerationandtannerywastewatertreatment
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Iron Oxide–Modified Carbon Electrode and Sulfate-Reducing Bacteria for Simultaneous Enhanced Electricity Generation and Tannery Wastewater Treatment

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