Application Of Modified Anode In Perchlorate Wastewater Treatment By Microbial Fuel Cell

Perchlorate is a persistent pollutant,its discharge into the environment can have certain toxic effects on human health.Microbial Fuel Cell（MFC）converts the chemical energy contained in waste water or waste into electric energy by electrogenic microorganisms,it can realize resource recycling at the same time of waste treatment.Therefore,this paper conducted a study on the treatment of perchlorate by MFC;the sodium perchlorate was used as a model pollutant.Three kinds of composite materials,PMo₁₂-rGO-PAN、PMo₁₂-rGO-PPy and PW₁₂-rGO-PPy were prepared for modifying MFC anode in this paper.The performance of the modified anodes were analyzed,the influence of anode modification by composite materials on the electrical performance and the degradation of perchlorate performance of MFC were investigated.The specific results are as following:1)PMo₁₂-rGO,PMo₁₂-PAN,PAN-rGO and PMo₁₂-rGO-PAN composites materials can effectively increase the anode surface area,enhance the anode electrochemical properties and reduce the anode charge transfer resistance,promoting electron transfer rate of the anode,thereby enhancing the electricity production performance.The electricity production performance of PMo₁₂-rGO-PAN anode MFC was better than the other MFCs,its maximum output voltage and total voltage were 160.1 m V and 677.5 V,respectively,which were 2.6 times and 14.1 times of bare anode MFC.The perchlorate degradation efficiency of PMo₁₂-rGO-PAN anode MFC reached 90%when the perchlorate concentration increased to 700mg·L^-1,it was much higher than other MFCs.2)PMo₁₂-rGO、PMo₁₂-PPy、PPy-rGO and PMo₁₂-rGO-PPy composites materials can effectively increase the anode surface area,enhance the anode electric catalytic activity,decrease the anode charge transfer resistance,promoting electron transfer rate on the surface of the anode,and thus enhance the MFC production performance.The electricity production performance of PMo₁₂-rGO-PPy anode MFC was better than the other MFCs,its maximum output voltage and the total voltage were 143.8 m V and 318.6 V,respectively,which were 2.6 times and 3.6 times of the bare anode MFC.The perchlorate degradation efficiency of PMo₁₂-rGO-PPy anode MFC reached 90%when the perchlorate concentration increased to 700mg·L^-1,it was much higher than other MFCs.3)PW₁₂-rGO、PW₁₂-PPy、PPy-rGO and PW₁₂-rGO-PPy composites materials can effectively increase the anode surface area and the diversity of anode surface flora,PW₁₂-rGO improved the electrochemical performance of anode,while PW₁₂-PPy、PPy-rGO and PW₁₂-rGO-PPy reduced the electrochemical activity of the anode and were not conducive to electricity production performance.The electricity production performance of PW₁₂-rGO anode MFC was better than the other MFCs,its maximum output voltage and the total voltage of PW₁₂-rGO anode MFC were 200.9 m V and 248.7V,respectively,while the perchlorate degradation efficiency and degradation rate of PPy-rGO anode MFC was betterr than other MFCs,its perchlorate degradation efficiency of reached 90%when the perchlorate concentration increased to 700mg·L^-1,it was much higher than other MFCs.