Preparation Of Polyvinyl Alcohol/Conductive Polymer Pcomposites And Applications In Microbial Fuel Cells

Microbial Fuel Cell(MFC)can produce electricity by using various organic waste water as fuel.Therefore,MFC is a new water treatment technology for simultaneous wastewater treatment and power generation.Anode is the place where microbial growth,reproduce and produce electricity.So the selection of appropriate anode material plays a crucial role in improving the overall performance of MFC.This article will focus on improving the electricity generation of MFC through polyvinyl alcohol/conductive polymer composite and investigating the removal effect of antibiotic wastewater in MFC.Firstly,Polyvinyl alcohol(PVA)/Polyaniline(PANI)modified Carbon felt(CF)electrode was prepared by chemical oxidation method,and the best PANI loading was 8 mg/cm~2.The electrical properties of MFC were investigated using PVA/PANI-8 electrode as anode.The results showed that the maximum power density of MFC using PVA/PANI-8 as anode was585.2 m W/m~2,while that of MFC using bare CF as anode was only 211.2 m W/m~2.In the electrochemical test of anode,PVA/PANI-8 anode had better kinetic activity and good extracellular electron transfer ability than CF and PANI-8 anodes.Secondly,Polyvinyl alcohol/Polypyrrole(PVA/PPy)composites were prepared by freeze-thaw cycles.Scanning electron microscope(SEM)and mechanical compression tests showed that the pore size and mechanical strength of the materials increased with the increase of freeze-thaw cycles.Electrochemical tests showed that the electrode with five freeze-thaw cycles had excellent electrochemical properties.PVA/PPy-5 anode was applied to MFC,showing excellent electrical performance.The maximum power density of MFC was 1521.0m W/m~2.Electrochemical tests showed that PVA/PPy-5 anode had good electrocatalytic activity and extracellular electron transfer ability.In addition,the protein test and high-throughput analysis of PVA/PPy-5 anode showed that PVA/PPy-5 with three-dimensional network structure could not only increase the attachment of microorganisms,but also facilitate the enrichment of electricity-producing bacteria.Based on the previous research,the PVA/PPy/N-CNT-5 electrode was prepared by compounding PVA/PPy-5 material with Nitrogen-doped carbon nanotubes(N-CNT).The electrode was used as an anode for MFC,and the maximum power density was 1806.3m W/m~2.PVA/PPy/N-CNT-5 with the best performance was selected as the anode to construct a two-chamber MFC for the experimental study of antibiotic wastewater treatment.The effects of different concentrations of antibiotics and external resistance on the removal of antibiotics were investigated.The results showed that when the concentration of Sulfamonomethoxine(SMM)was 5 mg/L,the final removal rate could reach 83.3%.When the external resistance was 1000Ω,the removal rate of antibiotics reached 64.9%.