• 文献标题:   Graphene/biofilm composites for enhancement of hexavalent chromium reduction and electricity production in a biocathode microbial fuel cell
  • 文献类型:   Article
  • 作  者:   SONG TS, JIN YJ, BAO JJ, KANG DZ, XIE JJ
  • 作者关键词:   microbial fuel cell, biocathode, cr vi reduction, graphene
  • 出版物名称:   JOURNAL OF HAZARDOUS MATERIALS
  • ISSN:   0304-3894 EI 1873-3336
  • 通讯作者地址:   Nanjing Tech Univ
  • 被引频次:   18
  • DOI:   10.1016/j.jhazmat.2016.05.055
  • 出版年:   2016

▎ 摘  要

In this study, a simple method of biocathode fabrication in a Cr(VI)-reducink microbial fuel cell (MFC) is demonstrated. A self-assembling graphene was decorated onto the biocathode microbially, constructing a graphene/biofilm, in situ. The maximum power density of the MFC with a graphene biocathode is 5.7 times that of the MFC with a graphite felt biocathode. Cr(VI) reduction was also enhanced, resulting in 100% removal of Cr(VI) within 48 h, at 40 mg/L Cr(VI), compared with only 58.3% removal of Cr(VI) in the MFC with a graphite felt biocathode. Cyclic voltammogram analyses showed that the graphene biocathode had faster electron transfer kinetics than the graphite felt version. Energy dispersive spectrometer (EDS) and X-ray photoelectron spectra (XPS) analysis revealed a possible adsorption-reduction mechanism for Cr(VI) reduction via the graphene biocathode. This study attempts to improve the efficiency of the biocathode in the Cr(VI)-reducing MFC, and provides a useful candidate method for the treatment of Cr(VI) contaminated wastewater, under neutral conditions. (C) 2016 Published by Elsevier B.V.