微生物燃料电池耦合BiVO4光电催化作用降解污染物

利用水热合成方法制备单斜晶型光催化剂Bi VO_4,首次将Bi VO_4引入MFC中,构建全新的PEC-MFC,EC-MFC耦合体系,并研究其对氨氮与染料废水的降解效果及能量消耗。PEC-MFC与EC-MFC耦合体系2 h内均能对Rh B达到95%以上的降解率;在中性偏酸条件下,可提高耦合体系对NH_4~+-N的降解效果,且O_2是耦合体系的主要决定因素;PEC-MFC和EC-MFC的单位电能消耗量为0.895和0 k Wh·m~(-3),在最优条件下,PEC-MFC最大输出电压为0.476 V,最大输出功率为755.25 m W·m~(-2)。研究了叔丁醇、KI对耦合体系的影响以探究耦合体系的主要氧化物种,阐述了光催化-微生物燃料电池的耦合机理。

Contaminants Removal by BiVO4 Photocatalyst in PEC-MFC Coupling System

BiVO₄ was successfully synthesized via hydrothermal method, and was introduced into brand-new coupled PEC-MFCand EC-MFCsystem. The efficiency of BiVO₄/PEC-MFCsystem in removing NH₄⁺-Nand RhBas the model pollutant, and the energy consumption were studied. Both in the PEC-MFCsystem and EC-MFCsystem with visible light illumination, 95% of RhBcan be removed in₁₂₀ min. The results demonstrate that the PEC-MFCsystem shows higher efficiency in converting NH₄⁺-Nin weak acidic condition, and oxygen is the decisive factor in the coupling system. The electrical energy per order of PEC-MFCand EC-MFCsystem are 0.895 and 0 kWh·m^-3, respectively. The maximum cell voltage 0.427 Vand power density 755.25 mW·m^-2 can be achieved in the coupled bio-electrochemical and photo-electro-catalytic reactor. The effect of TBA(tetra butyl alcohol) and KIon the PC, PEC-MFCand EC-MFCsystem was studied for exploring the main oxidative species and pathways (highly active ·OH, ·O₂^-), and for elucidating the coupling mechanisms in PEC-MFC.