In order to investigate the effects of Fe on the efficiency of photocatalytic,electrocatalytic,and photoelectrocatalytic degradation of organic pollutants in water,as well as the mechanism by which Fe enhances the photoelectrocatalytic efficiency,Co,N,P/TiO2/SiO2/CoFe2O4 particles were used as particle electrodes for the photoelectrocatalytic degradation of Rhodamine B,and the changes in Fe concen-tration during the catalytic reaction were detected.The results indicate that the presence of Fe can significantly improve the efficiency of photocatalytic,electrocatalytic,and photoelectrocatalytic degradation of Rhodamine B.Among them,Fe3+can increase the photocatalytic reaction rate by 290.68％;Fe2+,Fe3+,and sacrificial anode methods can increase the electrocatalytic reaction rates by 59.21％,250.94％,and 162.45％,respectively;it can increase the photocatalytic reaction rates by 37.38％,536.86％,and 525.44％,respectively.During the photocatalytic reaction process,the concentration of Fe3+rapidly decreases.The mechanism by which Fe enhances the photo-electrocatalytic efficiency is mainly analyzed as follows:Fe3+acts as a photo-generated electron capture agent,accelerating the separation of photo-generated electrons and holes on TiO2,which makes the photocatalytic reaction produce more·OH;Fe3+is reduced to Fe2+at the cathode;Fe2+can react with H2O2 generated during photocatalysis or electrochemical oxidation to generate·OH.
photoelectrocatalyticFe-assisted photoelectrocatalyticTiO2Rhodamine B
NETL
NSTL
万方数据
