title: Effects of azide on electron transport of exoelectrogens in air-cathode microbial fuel cells.
abstract: The effects of azide on electron transport of exoelectrogens were investigated using air-cathode MFCs. These MFCs enriched with azide at the concentration higher than 0.5mM generated lower current and coulomb efficiency (CE) than the control reactors, but at the concentration lower than 0.2mM MFCs generated higher current and CE. Power density curves showed overshoot at higher azide concentrations, with power and current density decreasing simultaneously. Electrochemical impedance spectroscopy (EIS) showed that azide at high concentration increased the charge transfer resistance. These analyses might reflect that a part of electrons were consumed by the anode microbial population rather than transferred to the anode. Bacterial population analyses showed azide-enriched anodes were dominated by Deltaproteobacteria compared with the controls. Based on these results it is hypothesized that azide can eliminate the growth of aerobic respiratory bacteria, and at the same time is used as an electron acceptor/sink.
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China.
authors: Xiangtong
authors: X
authors: Zhou
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China; School of Life Science and Biotechnology, Harbin Institute of Technology, Nangang District, Harbin, China.
authors: Youpeng
authors: Y
authors: Qu
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China; Bioelectrochemistry Laboratory, Water Environment and Remediation Research Centre, Korea Institute of Science and Technology, Republic of Korea; Fuel Cell Institute, National University of Malaysia, 43600 UKM, Bangi, Malaysia.
authors: Byung Hong
authors: BH
authors: Kim
authors: Bioelectrochemistry Laboratory, Water Environment and Remediation Research Centre, Korea Institute of Science and Technology, Republic of Korea.
authors: Pamela Yengfung
authors: PY
authors: Choo
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China.
authors: Jia
authors: J
authors: Liu
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China.
authors: Yue
authors: Y
authors: Du
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China.
authors: Weihua
authors: W
authors: He
authors: Energy and Biotechnology Laboratory, School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Republic of Korea.
authors: In Seop
authors: IS
authors: Chang
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China.
authors: Nanqi
authors: N
authors: Ren
authors: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, China. Electronic address: yujief@hit.edu.cn.
authors: Yujie
authors: Y
authors: Feng
mesh_terms: D000388:Air; D001386:Azides / Q000633:toxicity*; D001419:Bacteria / Q000187:drug effects / Q000378:metabolism; D001674:Bioelectric Energy Sources; D019149:Bioreactors / Q000382:microbiology; D055664:Electrochemical Techniques; D004566:Electrodes; D004579:Electron Transport / Q000187:drug effects; D004583:Electrons; D010100:Oxygen / Q000032:analysis; D013997:Time Factors
chemical_list: D001386:Azides; D010100:Oxygen
keywords: Azide; Azide reduction; Coulomb efficiency; Electron acceptor; Power overshoot