Preparation Of Anode For Biomas S-based Microbial Fuel Cell And Performance Study

With the rapid development of the economy and society and the gradual improvement of people’s human living standards,the severe shortage water resources has hindered the survival and development of human beings,According to the survey,China’s per capita fresh water resources are only one-quarter of the world average,so it is imperative to realize efficient wastewater treatment.Traditional wastewater treatment technology only focuses on simple wastewater purification treatment,but cannot reuse resources.Biological treatment technologies can achieve wastewater purification and energy conversion,but most of them require additional energy consumption.In this context,emerging technologies based on bioelectrochemical systems have emerged.Microbial fuel cell（MFC）is a promising technology that uses microorganisms as catalysts to degrade organic matter in wastewater and convert chemical energy into electrical energy.MFC has received much attention from researchers in recent years as a sustainable and environmentally friendly bioelectrochemical technology.Although a lot of research has been done on scaling up and improving efficiency,there are still some insurmountable problems,such as relatively low power output and electron transfer efficiency,large-scale applications and difficulties in cost reduction.The development of better anode materials can help solve these problems.The anode is a critical component in MFC,where microbial colonization growth and reproduction and electron transfer occur,and the close contact between microorganisms and the anode facilitates energy conversion.Currently commercial anode materials such as carbon cloth,carbon felt and carbon fiber are available at low cost.However,the relatively small specific surface area and relatively smooth surface make it difficult for microorganisms to adhere and the electrochemical performance is poor,which has become a key factor limiting their commercialization.To address the above problems,this thesis prepared some biomass-derived porous carbon materials and constructed three different MFC porous carbon anodes for wastewater treatment and energy regeneration by a simple preparation method and modulation of pore size structure.The main research is as follows:（1）The heteroatom co-doped 3D porous carbon anode was prepared by the one-step carbonization method using red dates as the biomass base material,which is easy to prepare.Three 3D porous carbon materials with excellent pore structure were prepared by the regulating of calcination temperature,and the results showed that they have large specific surface area and good biocompatibility,and play a positive role in the energy conversion process using microorganisms as biocatalysts,among which the highest power density of CCD-1000 can reach the maximum power density of12.17W/m³,which is 1.62 times higher than that of carbon felt.Its excellent potential for wastewater treatment and energy regeneration was confirmed by the evaluation of COD removal rate and Coulomb efficiency.（2）N,P co-doped porous composite carbon foam as MFC anode was successfully prepared by loading bacterial cellulose（BC）by dipping method after high temperature carbonization at 1000°C under argon/hydrogen mixed atmosphere using dehydrated treated ginger as biomass carrier material,and the results showed that its structural features are beneficial to the battery performance The maximum bulk power density of MFCs with BCCG-1000 anode is 14.0 m W/m²and the current density is 7.56A/m²,which exceeds all the reported 3D anodes reported so far.In addition,the unique spatial structure of the BCCG-1000 anode material has a significant effect on the removal of heavy metal ions Ni²⁺and Cu²⁺.（3）The N and P co-doped porous 3D high performance MFC independent anodes were successfully prepared by high temperature calcination method,using the same biomass substrate material（ginger）in the previous chapter,still using the carbonization temperature as a variable to prepare three anode materials,the unique pore structure structure,high level of N and P doping,alleviating the problem of poor interaction between microorganisms and anode materials,thus achieving rapid through the respiration of microorganisms In addition,the MFC with CG-1000 as the anode material can rapidly decolorize and almost completely remove the azo dye methyl orange within 20 hours,which further confirms that the CG anode has a good application prospect in the field of large-scale wastewater treatment and energy production.