Enhanced bioelectroremediation of heavy metal contaminated groundwater through advancing a self-standing cathode

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dc.contributor.author Ali, Jafar
dc.contributor.author Zheng, Changhong
dc.contributor.author Lyu, Tao
dc.contributor.author Oladoja, Nurudeen Abiola
dc.contributor.author Lu, Ying
dc.contributor.author An, Wengang
dc.contributor.author Yang, Yuesuo
dc.date.accessioned 2024-05-15T14:46:22Z
dc.date.available 2024-05-15T14:46:22Z
dc.date.issued 2024-04-18
dc.identifier.citation Ali J, Zheng C, Lyu T, et al., (2024) Enhanced bioelectroremediation of heavy metal contaminated groundwater through advancing a self-standing cathode. Water Research, Volume 256, June 2024, Article number 121625 en_UK
dc.identifier.issn 0043-1354
dc.identifier.uri https://doi.org/10.1016/j.watres.2024.121625
dc.identifier.uri https://dspace.lib.cranfield.ac.uk/handle/1826/21625
dc.description.abstract Hexavalent chromium (Cr(VI)) contamination in groundwater poses a substantial global challenge due to its high toxicity and extensive industrial applications. While the bioelectroremediation of Cr(VI) has attracted huge attention for its eco-friendly attributes, its practical application remains constrained by the hydrogeochemical conditions of groundwater (mainly pH), low electron transfer efficiency, limitations in electrocatalyst synthesis and electrode fabrication. In this study, we developed and investigated the use of N, S co-doped carbon nanofibers (CNFs) integrated on a graphite felt (GF) as a self-standing cathode (NS/CNF-GF) for the comprehensive reduction of Cr(VI) from real contaminated groundwater. The binder free cathode, prepared through electro-polymerization, was employed in a dual-chamber microbial fuel cell (MFC) for the treatment of Cr (VI)-laden real groundwater (40 mg/L) with a pH of 7.4. The electrochemical characterization of the prepared cathode revealed a distinct electroactive surface area, more wettability, facilitating enhanced adsorption and rapid electron transfer, resulting in a commendable Cr(VI) reduction rate of 0.83 mg/L/h. The MFC equipped with NS/CNF-GF demonstrated the lowest charge transfer resistance (Rct) and generated the highest power density (155 ± 0.3 mW/m2) compared to control systems. The favorable electrokinetics for modified cathode led to swift substrate consumption in the anode, releasing more electrons and protons, thereby accelerating Cr(VI) reduction to achieve the highest cathodic coulombic efficiency (C.Eca) of80 ± 1.3 %. A similar temporal trend observed between Cr(VI) removal efficiency, COD removal efficiency, and C.Eca, underscores the effective performance of the modified electrode. The reusability of the binder free cathode, exemption from catholyte preparation and the absence of pH regulation requirements highlighted the potential scalability and applicability of our findings on a larger scale. en_UK
dc.language.iso en_UK en_UK
dc.publisher Elsevier en_UK
dc.rights Attribution 4.0 International *
dc.rights.uri http://creativecommons.org/licenses/by/4.0/ *
dc.subject Bioelectricity en_UK
dc.subject Carbon nanofibers en_UK
dc.subject Chromium en_UK
dc.subject Electroremediation en_UK
dc.subject Green technologies en_UK
dc.subject Toxic metals en_UK
dc.title Enhanced bioelectroremediation of heavy metal contaminated groundwater through advancing a self-standing cathode en_UK
dc.type Article en_UK
dcterms.dateAccepted 2024-04-15
dc.identifier.eissn 1879-2448

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