Next Article in Journal
Electrochemical Hydrogel Lithography of Calcium-Alginate Hydrogels for Cell Culture
Next Article in Special Issue
Applications of Graphene-Modified Electrodes in Microbial Fuel Cells
Previous Article in Journal
Experimental Study on Full-Scale Beams Made by Reinforced Alkali Activated Concrete Undergoing Flexure
Open AccessArticle

Electricity Recovery from Municipal Sewage Wastewater Using a Hydrogel Complex Composed of Microbially Reduced Graphene Oxide and Sludge

1
Department of Civil Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
2
Nagoya Municipal Industrial Research Institute, 3-4-41, Rokuban, Atsuta-ku, Nagoya 456-0058, Japan
3
Nippon Koei Co., Ltd., 1-14-6 Kudankita, Chiyoda-ku, Tokyo 102-8539, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Der-Jang Liaw
Materials 2016, 9(9), 742; https://doi.org/10.3390/ma9090742
Received: 24 June 2016 / Revised: 17 August 2016 / Accepted: 19 August 2016 / Published: 31 August 2016
(This article belongs to the Special Issue Microbial Fuel Cells)
Graphene oxide (GO) has recently been shown to be an excellent anode substrate for exoelectrogens. This study demonstrates the applicability of GO in recovering electricity from sewage wastewater. Anaerobic incubation of sludge with GO formed a hydrogel complex that embeds microbial cells via π-π stacking of microbially reduced GO. The rGO complex was electrically conductive (23 mS·cm−1) and immediately produced electricity in sewage wastewater under polarization at +200 mV vs. Ag/AgCl. Higher and more stable production of electricity was observed with rGO complexes (179–310 μA·cm−3) than with graphite felt (GF; 79–95 μA·cm−3). Electrochemical analyses revealed that this finding was attributable to the greater capacitance and smaller internal resistance of the rGO complex. Microbial community analysis showed abundances of Geobacter species in both rGO and GF complexes, whereas more diverse candidate exoelectrogens in the Desulfarculaceae family and Geothrix genus were particularly prominent in the rGO complex. View Full-Text
Keywords: graphene oxide; municipal sewage wastewater; microbial fuel cell; Geobacter; Geothrix graphene oxide; municipal sewage wastewater; microbial fuel cell; Geobacter; Geothrix
Show Figures

Graphical abstract

MDPI and ACS Style

Yoshida, N.; Miyata, Y.; Mugita, A.; Iida, K. Electricity Recovery from Municipal Sewage Wastewater Using a Hydrogel Complex Composed of Microbially Reduced Graphene Oxide and Sludge. Materials 2016, 9, 742.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop