Desulfurization and denitrification performance of corn straw biochar electrode for microbial fuel cell
In this study,the performance of corn straw biochar as the electrode of microbial fuel cell was investigated.The anode and cathode were configured with S2-as the exclusive electron donor,and with NO3-as the electron acceptor,respectively,and carbon felt was employed as the reference electrode to assess the electrochemical performance,power generation capability,and pollutant removal capacity of the corn stalk biochar electrodes in the simultaneous desulfurization-denitrification microbial fuel cells.Furthermore,the influences of different sulfur-to-nitrogen concentration ratios on the denitrification and desulfurization efficiency and the electrical energy output of the biochar electrode microbial fuel cells were explored.The experimental results show that the corn straw biochar microbial fuel cell achieved higher exchange current density(22.42× 10-3 A·cm-2)and lower charge transfer resistance(4.24 Ω).Compared with carbon felt electrode,the maximum output voltage and power density of microbial fuel cell with corn straw biochar electrode increased by 18.91％and 16.67％,respectively.When the ratio of sulfur to nitrogen was 5:4,the best desulfurization,denitrification and electricity generation capacity occurred for the reactor.The effluent concentration of S2-in anode chamber decreased from 120 mg·L-1 to 1.08 mg·L-1,and the removal rate was 99.1％,of which 76.52％converted to SO42--S,and the removal rate of NO3--N in cathode chamber was 94.5％.At this time,the output voltage and power density of the reactor reached the maximum values,which were 450.68 mV and 1.03 W·m-2,respectively.
microbial fuel cellbiochardesulphurization and denitrificationelectrocatalysis
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