Study On Anode Material Of Photocatalytic Microbial Fuel Cell

Microbial fuel cell(MFC)is a technology that synchronizes sewage treatment and power generation.It is a water treatment technology and power generation technology that uses microorganisms to convert biochemical energy into electricity.However,the low electricity production performance of MFC restricts its practical application and development,among which electrode materials and electricity producing microorganisms are the most important constraints.The performance of anode materials,such as conductivity,biocompatibility and cost,are also important factors affecting the electricity production performance and development of MFC.Anode materials,as the attachment carrier of electricity producing microorganisms,directly affect the electronics in MFC The electrochemical activity of electricity producing microorganisms also directly affects the electricity producing performance of MFC,which is an important part of MFC.In this paper,titanium based titanium dioxide composite was used as the anode of microbial fuel cell,and compared with titanium sheet electrode,the superiority of titanium based titanium dioxide composite as MFC anode material was studied;and aiming at the selection and domestication of titanium based titanium dioxide anode material suitable for electrode producing microorganisms,by applying induced voltage,the process of anode inoculation and coating was accelerated After that,in order to further improve the electricity production performance of titanium dioxide anode material MFC,the influence of tungsten light intensity on the photocatalytic performance of titanium dioxide composite material was studied.Under suitable light conditions,the electricity production performance of MFC was further improved by surface modification of titanium dioxide substrate material.Titanium matrix titanium dioxide composite was used as the anode of microbial fuel cell,and titanium sheet was used as the control group.The results show that the maximum stable output voltage and power density of MFC with titanium matrix titanium dioxide composite as anode are 445mv and 142MW/m~2,respectively,which are 1.46 times and 1.45 times of that of titanium sheet electrode,indicating that titanium matrix titanium dioxide has better electrical performance and is suitable for the anode material of MFC.The semi-solid medium and liquid medium were used to screen and domesticate the microorganisms.A small amount of oxygen could be incorporated into the semi-solid medium to identify the movement ability and respiratory type of bacteria,and initially determine the range of induced voltage.Then the liquid medium determined that the microorganisms cultivated with induced voltage value were used as the inoculated microorganisms of MFC.The results show that the power generation performance and COD removal rate of MFC after screening and domestication have been greatly improved.The maximum stable voltage and power density of MFC have reached 572.1mv and 145MW/m~2respectively,while those without microbial screening and domestication have reached 445mv and 142MW/m2 respectively.In order to further improve the electricity production performance of MFC and explore the influence of the light intensity of tungsten lamp on the photocatalytic performance of titanium based titanium dioxide,four groups of experimental groups with different light intensity were set up respectively.The experimental results show that the experimental group with the light intensity of 15.20w/m~2has the best results.The maximum stable voltage of MFC can reach 653.4mv,the maximum power density of 181 MW/m~2,and the removal rate of COD can reach 9 3.4%?Then,three different ways of surface modification were carried out on titanium dioxide based materials.The results showed that the MFC power generation performance and COD removal rate of gauze group were the best,the maximum stable voltage of gauze group was 769.2mv,1.07 and 1.45 times of agar medium group and grinding group,and the maximum power density of gauze group was 192mw/m~2,1.14 and 1.45times of agar medium group and grinding group 38 times.