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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2018, Vol. 12 Issue (4) : 11
Algal biomass derived biochar anode for efficient extracellular electron uptake from Shewanella oneidensis MR-1
Yan-Shan Wang1, Dao-Bo Li1, Feng Zhang1, Zhong-Hua Tong1,2(), Han-Qing Yu1
1. CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science & Technology of China, Hefei 230026, China
2. Anhui Province Key Laboratory of Polar Environment and Global Change, University of Science & Technology of China, Hefei 230026, China
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Algal biochar anode produced higher biocurrent compared with graphite plate anode.

Algal biochar exhibited stronger electrochemical response to redox mediators.

Algal biochar showed excellent adsorption to redox mediators.

The development of cost-effective and highly efficient anode materials for extracellular electron uptake is important to improve the electricity generation of bioelectrochemical systems. An effective approach to mitigate harmful algal bloom (HAB) is mechanical harvesting of algal biomass, thus subsequent processing for the collected algal biomass is desired. In this study, a low-cost biochar derived from algal biomass via pyrolysis was utilized as an anode material for efficient electron uptake. Electrochemical properties of the algal biochar and graphite plate electrodes were characterized in a bioelectrochemical system (BES). Compared with graphite plate electrode, the algal biochar electrode could effectively utilize both indirect and direct electron transfer pathways for current production, and showed stronger electrochemical response and better adsorption of redox mediators. The maximum current density of algal biochar anode was about 4.1 times higher than graphite plate anode in BES. This work provides an application potential for collected HAB to develop a cost-effective anode material for efficient extracellular electron uptake in BES and to achieve waste resource utilization.

Keywords Algal biochar      Anode material      Electrochemical activity      Extracellular electron transport      Waste resource utilization     
Corresponding Authors: Zhong-Hua Tong   
Issue Date: 31 July 2018
 Cite this article:   
Yan-Shan Wang,Dao-Bo Li,Feng Zhang, et al. Algal biomass derived biochar anode for efficient extracellular electron uptake from Shewanella oneidensis MR-1[J]. Front. Environ. Sci. Eng., 2018, 12(4): 11.
Fig.1  Characterization of algal biochar and graphite plate electrodes. (a) and (b) SEM images; (c) FT-IR spectra; (d) Raman spectra
Fig.2  Time course of current output with different electrodes in BESs
Anode materials Anode microbe Imax (mA/cm2) Reference
Graphite disk S. oneidensis MR-1 3.6 Fan et al. (2011)
Graphite/Au S. oneidensis MR-1 74.4 Fan et al. (2011)
Graphite/Pd S. oneidensis MR-1 8.8 Fan et al. (2011)
Carbon paper S. oneidensis MR-1 ~3.8 Zhang et al. (2015)
Carbon paper/WO3 S. oneidensis MR-1 ~ 4 Zhang et al. (2015)
3D porous carbon S. oneidensis MR-1 ~38.2 Bian et al. (2018)
Porous carbon paper Anaerobic sewage sludge ~8.5 Kim et al. (2005)
Graphite plate S. oneidensis MR-1 2.2 This study
Algal biochar S. oneidensis MR-1 9.1 This study
Tab.1  Comparison of the maximum current density of different anode materials
Fig.3  (a) Electrochemical impedance spectra of sterile electrodes in 10 mmol/L [Fe(CN)6]3-/4- with 0.1 mol/L KCl; (b) Ohmic resistance (Rs) and charge transfer resistance (Rct) of the sterile electrodes; (c) Electrochemical impedance spectra of graphite plate and algal biochar electrodes in BES; (d) The CV profiles of sterile electrodes and the electrodes in BESs
Fig.4  SEM images of (a) algal biochar and (b) graphite plate anode when the current reached their maximum levels
Fig.5  (a) Color changes of 100 µg/L riboflavin solution with 5 mg of graphite powder or algal biochar added; (b) Time course of current output with RF modified algal biochar anode
Fig.6  CV of riboflavin at sterile electrodes. Graphite plate and algal biochar-1 electrodes were in mineral medium containing 5 µmol/L riboflavin. Algal biochar-2 electrode was in mineral medium without riboflavin
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