碳酸氢铵电化学氧化阳极对含油海底沉积物微生物燃料电池性能影响及其加速降解研究

制备了3种阳极(未改性阳极、氨水改性阳极、NH_4HCO_3电化学氧化改性阳极)组建海底沉积物微生物燃料电池(MSMFCs),探究阳极的不同氨改性方法对含油MSMFCs电化学性能和石油降解率的影响。结果表明,电化学氧化改性阳极的电容特性是未改性阳极组的1.78倍,并且其抗极化能力最强,交换电流密度为2.57×10~(-2)A·m~(-2),是未改性的5.00倍;由电化学氧化改性阳极组建的电池的最大输出功率密度是1.53×102m W·m~(-2),较空白组的增加3.56倍,且该电池阳极沉积物中石油的降解率是空白组的10.40倍,这是因为改性阳极表面连入了有利于微生物附着的酰胺基团和氨基基团,提高了电池电化学性能并加速了石油的降解。

Effect of Ammonium Bicarbonate Modified Anode by Electrochemical Oxidation on the Performance of Petroliferous Marine Sediment Microbial Fuel Cells and Its Accelerating Degradation of Petroleum

The marine sediment microbial fuel cells (MSMFCs) have been constructed with three types of anodes:unmodified anode (blank control),ammonia modified anode and NH4 HCO3 modified anode by electrochemical oxidation.The influences of the ammonia modified anodes on electrochemical performances of petroliferous MSMFCs are explored and their effects on accelerating petroleum degradation are investigated.The results show that the electrochemical performance of the anode modified by NH4HCO3 is 1.78 times that of the blank control,and its electrochemical activity and polarization resistance are optimal.Its exchange current density is 2.57 × 10-2 A · m-2,which is 5.00 times of that of the unmodified one.The maximum output power density of the MSMFCs with the NH4HCO3 modified anode is 1.53 × 102 mW · m-2,which is 3.56 times more of that of MSMFCs with unmodified anode,and its petroleum degradation rate is 10.40 times as high as that of the blank control,for the existence of hydrophilic amide groups and amino groups on the modified anode surface is favorable for the attachment of microorganisms.The electrochemical performance of the MSMFCs with NH4HCO3 modified anode by electrochemical oxidation is significantly improved.