HA@Fe3O4 modified anode to enhance degradation of estrogen in microbial fuel cells
Microbial fuel cell(MFC)anode was modified with a metal compound(HA@Fe3O4)formed by humic acid(HA)and nano-Fe3O4 particles with strong capacitive properties.The degradation characteristics of simulated wastewater containing 17α-ethynylestradiol(EE2)as representative steroid estrogen(SEs)at the MFC anode were evaluated,while the electrogenic properties of MFC during EE2 degradation were also characterized.Data from electrochemical AC impedance test showed that,the ohmic impedance and charge-transfer impedance of the MFC with HA@Fe3O4 were reduced by 79.58%and 89.60%,respectively,compared with those of the MFC without HA@Fe3O4.Cyclic voltammetry results indicated that the presence of HA@Fe3O4 significantly increased the capacitance of the anode plate.The maximum power density of the MFC after HA@Fe3O4 modification reached up to 537.37 mW/m2.HA@Fe3O4 modified anode significantly improved the removal rate of EE2 by MFC.EE2 could mediate electron transfer at low concentrations(≤5.0 μmol/L)and improve the electrical performance of MFC,thus promoting the ability of MFC to remove EE2.However,high concentration(5.0～10.0 μmol/L)could inhibit microbial activity and reduce the electrical generation efficiency of MFC.
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