title: Bioelectrochemical Chromium(VI) Removal in Plant-Microbial Fuel Cells.
abstract: Plant-microbial fuel cell (PMFC) is a renewable and sustainable energy technology that generates electricity with living plants. However, little information is available regarding the application of PMFC for the remediation of heavy metal contaminated water or soil. In this study, the potential for the removal of heavy metal Cr(VI) using PMFC was evaluated, and the performance of the PMFC at various initial Cr(VI) contents was investigated. The Cr(VI) removal efficiency could reached 99% under various conditions. Both the Cr(VI) removal rates and the removal efficiencies increased with the increasing initial Cr(VI) concentration. Furthermore, the long-term operation of the PMFC indicated that the system was stable and sustainable for Cr(VI) removal. The mass balance results and XPS analysis results demonstrate that only a small amount of soluble Cr(III) remained in the PMFC and that most Cr(III) precipitated in the form of the Cr(OH)3(s) or was adsorbed onto the electrodes. The PMFC experiments of without acetate addition also show that plants can provide carbon source for MFC through secrete root exudates and bioelectrochemical reduction of Cr(VI) was the main mechanism for the Cr(VI) removal. These results extend the application fields of PMFC and might provide a new insight for Cr(VI) removal from wastewater or soil.
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026 China.|College of Chemistry and Chemical Engineering, Xinjiang Normal University , Urumqi, 830054, China.
authors.forename: Nuzahat
authors.initials: N
authors.lastname: Habibul
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026 China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Hu
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026 China.
authors.forename: Yun-Kun
authors.initials: YK
authors.lastname: Wang
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026 China.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026 China.
authors.forename: Han-Qing
authors.initials: HQ
authors.lastname: Yu
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026 China.
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Sheng
mesh_terms: D000327:Adsorption; D001674:Bioelectric Energy Sources; D002857:Chromium / Q000302:isolation & purification* / Q000378:metabolism; D004566:Electrodes; D004867:Equipment Design; D007700:Kinetics; D008129:Lolium / Q000378:metabolism*; D010944:Plants; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000378:metabolism
chemical_list: D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion