PANIBiVO耦合生物阳极降解污染物系统研究.docx

PAN／／BiV04耦合生物阳极降解污染物系统研究Systematic PAN／／BiV04耦合生物阳极降解污染物系统研究 Systematic Study of Pollutants Removal by PANI／BiV04 Cathode Coupled with Bio．Anode Ab stract In this study．stainless steel mesh was Ioaded with photocatalyst BiV04 and／or polyaniline (PANI)composited PANIIBiV04 and tested cathode in coupled microbial fuel cells(MFC) reactor for electro--catalytic and／or photo—·electro·catalytic removal of RhB and ammonium nitrogen．Characterizations by XRD，SEM，UV—diffuse reflectance spectra and cyclic voltammograms were used to analyze the as—prepared catalysts．RhB and NH4+-N were used as the targeted model pol lutants，and the removal efficiency were determined in photocatalytic system(PC)，photo—electrochemical(PEC)coupled microbial fuel cell(MFC)system(PEC— MFC)and electrochemical(EC)coupled microbial fuel cell(MFC)system(EC—MFC)．The electrical energy per order(EEO)，output voltage and power density were calculated to evaluated the energy consumption and electric energy output of PEC-MFC，Further more，the reaction mechanism and the main reactive oxygen species in different systems were in—depth study well．The results and conclusions are shown as foIlows： (1)The as—prepared BiV04 photocatalysts were ofmonoclinic type which had the highest photocatalytic activity among all the crystal structures of BiV04．The BiV04 and PANI／BiV04 powders had rodlike and cluster aggregate structures with monoclinic crystal BiV04 nano— particles(70 nm)．The compositing with PANI narrowed the band gap of BiV04 to 2．14 eV， with red shift in absorbency spectrum．The CV curves for PANI／BiV04(5％)electrodes showed higher current density than BiV04 electrode and suggested higher electron transfer reaction activity． (2)PANI／BiV04 exhibited higher catalytic activity than BiV04 both in purely photocatalytic reactor and in the coupled reactor．In the coupled system，removal of 93％RhB in 2h，and removal 91％RhB in 30 rain(adjusting the pH to 3)can be achieve in PEC·MFC system under visible light illumination．And