纳米MnO_2的制备及在MFC中处理生活污水的应用研究

Preparation of Manometer MnO_2 and Its Application to Domestic Wastewater Treatment with Microbial Fuel Cells

采用一步氧化还原法室温制备了MnO_2纳米颗粒,用XRD,FT-IR,SEM和TEM进行了表征。结果表明,制备的MnO_2纳米颗粒大小均匀,为无定型的δ-MnO_2,粒度为10-20 nm。用制备的纳米MnO_2制成MnO_2/Pt/C电极后,以电压、电流密度、功率密度、COD去除率、pH值等为试验指标,考察了其在MFC中处理生活污水中的应用效果。在MFC中生产的最大功率是360 m W·m^(-2),而相同条件下的Pt/C催化剂的最大功率密度为176 m W·m^(-2),MnO_2/C催化剂的最大功率密度为149 m W·m^(-2)。使用MnO_2/Pt/C阴极催化剂后废水COD的降解率为78%,比之相同条件下Pt/C催化剂的COD降解率67%要高。

MnO2 nanoparticles were prepared by one-step redox at room temperature. The sample was characterized by XRD, FT-IR, SEM and TEM. The results indicated that the MnO2 nanoparticles were amorphous 6-MnO2 of uniform size with the particle diameter of 10-20 nm. Cathode catalyst MnO2/Pt/C was synthesized by using the MnO2 nanoparticles. The voltage, current density, power density and COD removal rate were monitored to investigate the performance of the MFC. The maximum power of MFC with the MnOJPt/C cathode catalyst was 360 mW· m-2, and the maximum powers of MFC with Pt/C and MnO2/C catalyst were 176 mW·m-2 and 149 mW·m-2 under the same conditions. The removal rate of COD by MnO2/Pt/C cathode catalyst was 78%, compared to 67% COD removal obtained by using the MnO2/ Pt/C cathode catalyst under the same conditions.