Properties of Nitrogen Doped Furfural Derived Carbon Dots to Promote Bioelectricity Generation in Microbial Fuel Cells
Furfural and urea were selected as carbon sources,and high electron transfer nitrogen-doped furfural-based carbon dots(N-FCDs)were prepared by a simple one-step hydrothermal synthesis.The N-FCDs were combined with microorganisms from common cow dung in farms to construct the bioanode of the microbial fuel cells(MFC)and to enhance its electricity production performance.The morphology,structure and composition of N-FCDs were characterized with the help of transmission electron microscopy,Raman spectroscopy,infrared spectroscopy and other testing methods.The results showed that N-FCDs presented a quasi-spherical morphology,and their average particle size was about(4.7±0.02)nm.N-FCDs had abundant nitrogen and oxygen functional groups on the surface,and the nitrogen doping forms were graphite N,pyrrole N and pyridine N.After incubation with microorganisms at different mass concentrations(0-500 mg/L)of N-FCDs,there was no significant difference in the microbial growth curve,showing a good biosafety.The higher degree of graphitization of N-FCDs and electron-rich atom doping gave them high electron transfer properties.After the addition of N-FCDs,carbon dots were distributed both inside and outside the bacterial cells,the internal and external electron transfer channels of the bacteria were increased,the bacteria redox activity was significantly enhanced,and the overall electron transport impedance of the microorganisms was reduced.The N-FCDs significantly improved the microbial fuel cell power production performance,with the maximum current of 2.34 µA and the maximum voltage of 0.16 V,which were enhanced by 4.9 and 1.0 times,respectively.
microbial fuel cellscarbon dotselectroactive bacteriaelectron transfer rate
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