| Microbial Fuel Cell(MFC)is a device that can generate electricity from sewage and has a very large potential application.However,the current MFC has a general problem of low output power,and among which the anode material is one of the main factors affecting the performance of MFC.For the anode material with excellent performance,it should have the advantages of strong conductivity,stable chemical property and large specific surface area.Metal organic framework(MOF)material has the characteristics of large specific surface area,porous,and adjustable material composition,and is a potential electrode material.In this thesis,MOF materials containing Cu and Zn were prepared,mixed with guest metal salts,carbonized and washed at high temperature,and finally obtained nano-diatom materials with multi-level structure.The properties of MFC anodes and the influence of material composition on MFC properties were investigated.A classic MOF material HKUST-1 was synthesized by hydrothermal method.After carbonization,washing and other treatments,four carbon materials with diatom morphology were prepared,which were recorded as Cu-ATM,Cu-ATT,Zn-ATM and Zn-ATT.The successful synthesis of the material was demonstrated by a series of physical characterizations of the four nano-diatom materials.The comprehensive evaluation results showed that the degree of graphitization of the four materials were similar,and the degree of diatomization of Cu-ATM is the highest,and its surface area is 841.94 m~2/g,which is much larger than Cu-ATT,Zn-ATM and Zn-ATT.Electrochemical testing of the electrodes demonstrates that nanodiatom materials can reduce anode resistance and have minimal Cu-ATM resistance.The properties of Cu-ATM,Cu-ATT,Zn-ATM and Zn-ATT as MFC anodes were investigated.It was shown that the four materials have a improvement in MFC performance.For the output voltage of MFC,the maximum Zn-ATM is 0.635 V,and the minimum startup time is 2.2 days,and the minimum carbon cloth voltage is0.587 V.The maximum time is 7 days.For the output power of the MFC,the Cu-ATM is 3.30 W/m~2,the Cu-ATT is 3.10 W/m~2,and the carbon cloth is 2.44W/m~2.Similarly,MFC assembled with Cu-ATM material has higher COD removal efficiency and the highest COD degradation rate is 74.41%.The microbial community analysis showed that the anodic microorganisms were mainly Geobacter,and the material composition affected the microbial community structure.The surface of the Cu-ATT electrode had the highest proportion of Geobacter,which was consistent with its higher power density,indicating that the material was positive for the bacterium.Enrichment is also the main reason for improving MFC performance.In summary,the synthesized four nano-diatom materials have certain improvement on the electricity production performance of microbial fuel cells.It can be find that the comparison between various materials.Cu-ATM and Cu-ATT have more stable structure and better electrical conductivity.Battery performance and are superior to Zn-ATM and Zn-ATT,indicating that Cu-based materials are better.At the same time,it is clear that the ATM-incorporated effect is better by comparing the ATM and ATT.The nano-diatom material prepared in this thesis is expected to become a new type of electrode material,and provides building high-performance MFC anode materials. |
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