Study On Power Generation And Degradation Of Sulfonamides In Microbial Fuel Cell By Using MIL-53(Fe)/PPy Derivatives

By considering the increasingly prominent global energy crisis and environmental pollution,the use of microbial fuel cell（MFC）to process wastewater and simultaneously generate electricity is undoubtedly an ideal way to obtain green energy.However,the power generation performance and material cost still limit the development of MFC.The purpose of this paper is to adjust the microstructure and composition of the MIL-53（Fe）/PPy and Fe/Fe₄N@C derivative materials by changing the doping ratio and carbonization temperature,and explore the mechanism of the anode material to improve the electricity generation performance of MFC.The degradation effect and electricity generation performance of MFC on sulfonamide antibiotics were investigated.A metal-organic framework doped conductive polymer composite material（MIL-53（Fe）/PPy）was prepared to improve the electricity generation performance of MFC.Three ratios of 1:0.5,1:1 and 1:5 was used to control the composition of the composite material.Fourier tansfrom infrared（FTIR）and X-ray diffraction（XRD）showed that the material was successfully prepared;scanning electron microscopy（SEM）showed that material exhibited regular microsphere aggregates at 1:1.The electrochemical performance test proved that MIL-53（Fe）/PPy 1:1 is the best composite material.The MIL-53（Fe）/PPy 1:1 electrode was used as the anode and applied to the MFC.The results showed that the output voltage of the MIL-53（Fe）/PPy 1:1 anode MFC reached 630 m V,and the maximum power density（4853.44m W/m³）increased by 111.92%and 13.71%respectively compared with MIL-53（Fe）and PPy.The above results indicate that the material’s specific microstructure,good charge storage capacity are the main factors that promote microbial electron transfer and improve the electricity generation performance of MFC.Carbonized derivative material（Fe N@C）was synthesized by a one-step pyrolysis method using MIL-53（Fe）/PPy as the precursor.The morphology and composition of the temperature control material were explored,which further improved the electricity generation performance of MFC.SEM and XRD showed that the material collapsed into a smaller disordered structure at 900℃,which confirmed the presence of Fe/Fe₄N in the material.Electrochemical tests were carried out on electrodes prepared from these materials and their corresponding MFCs.The specific capacitance（1374.47 m F/cm²）and charge transfer resistance（4.32Ω）of Fe N@C（900）anode MFC were better than Fe N@C（400）,Fe N@C（600）anode MFC;Fe N@C（900）anode MFC output voltage reaches 650 m V and power density（6013.39 m W/m³）is increased by 50.71%and 26.92%compared with Fe N@C（400）and Fe N@C（600）.The above studies show that 900℃is the optimal calcination temperature,and the abundant porous channel network is conducive to rapid ion transport.The introduction of Fe/Fe₄N improves the conductivity and electrocatalytic activity of the material.Besides,the good biocompatibility of C-based materials and the magnetism of Fe/Fe₄N promotes the enrichment of microorganisms on the anode.Investigating the degradation efficiency simultaneously electricity generation of the MFC applied to sulfonamide antibiotics,and the influence of the added concentration and the type of antibiotics on the degradation effect was discussed.According to the results,the degradation efficiency of MFC to sulfamonomethoxine（SMM）decreased with the increase of the concentration which the maximum degradation rate was 62.77%.When the concentration was 20 mg/L,the degradation efficiency of SMM and sulfamethoxazole（SMX）was 51.48%-52.27%which indicated that antibiotics degradation by MFC was universal.Electrochemical impedance spectroscopy（EIS）showed that the ohmic resistance of MFC first increased and then decreased with the increase of antibiotic concentration,which confirmed that the anode microorganisms have an adaptive process to the toxicity of antibiotics.The power density of MFC with SMM is 22.5%higher than that of SMX.When the concentration of SMM is 20mg/L,MFC has the best power generation performance.In this research,a high-performance anode material was prepared and successfully applied to MFC which obtained a higher output power.This research also proved the feasibility of MFC for antibiotic degradation and simultaneous electricity generation.It has certain application value that provides a theoretical basis for the application of MFC to environmental pollution treatment while obtaining bioenergy.