Experimental and mechanism study on Fe-assisted photoelectrocatalytic
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
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