Removal Efficiency Of Antibiotics From Wastewater And Electricity Generation Performance Of Visible Light Catalytic Microbial Fuel Cell

With the consumption and abuse of antibiotics in many fields of our country,antibiotic pollution has gradually attracted people’s attention.TiO₂nanotubes were prepared on the surface of titanium plate by anodic oxidation method.By doping Fe and N elements,the photoanode materials with wider light response range were obtained.The morphology,crystal structure and optical absorption range were characterized by SEM+EDS,XRD and UV-Vis,and the transient photocurrent diagram and open circuit potential diagram were measured by electrochemical workstation to analyze the photoelectrochemical properties.The results show that the N-TiO₂nanotubes are arranged compactly and regularly,and the crystal orientation is consistent.The absorption intensity in the visible light range is significantly enhanced,and the N-TiO₂nanotubes have good photoelectrochemical properties.N-TiO₂ nanotube was used as the photocatalytic anode to degrade tetracycline hydrochloride under 350 W light.The analysis of liquid chromatography-mass spectrometry showed that the amino,methyl,hydroxyl and aldehyde groups in the side chain of tetracycline molecule were oxidized or replaced successively,and the ring structure was split to form single ring benzene series or cycloalkanes and other small molecule organic compounds.Through high-throughput sequencing,Alphaproteobacteria,gamma Proteobacteria,Nitrospira and actinobacteria were found to be dominant at the class level,which ensured the recycling of electron acceptors in the cathode chamber.Through electrochemical impedance testing and cyclic voltammetry scanning,it is found that the photo anode can accelerate the electron transfer and reduce the resistance of charge transfer under visible light catalysis.The internal resistance,especially ohmic internal resistance,decreased by several orders of magnitude after 7days under 350 W visible light.The system has the best output voltage,current density and power density.The output voltage is stable at 0.047 V,the current density is 313.25 m A/m³,the maximum is 382.2 m A/m³,the average power density is14.806 m W/m³,the maximum is 21.914 m W/m³.