Two-Dimensional BiOBr Nanosheets Coupled with FeOOH Quantum Dots as Composite Photo-Fenton Catalysts for Organic Pollutant Degradation under Visible Light

Graphical FeOOH/BiOBr composite photo-Fenton catalyst was prepared by simple precipitation and impregnation method, in which 1.8 % FeOOH/BiOBr had the highest photo-Fenton catalytic activity. The quantum size of FeOOH is beneficial to increase the number of active sites and improve the electron mobility between composites. FeOOH quantum dots (QDs) were successfully anchored on 2D BiOBr nanosheets as composite photo-Fenton catalysts by a simple precipitation and impregnation method. Using Rhodamine B (RhB) as an organic dye model, the photo-Fenton catalytic activity of the composite catalyst was significantly higher than that of BiOBr and FeOOH. Among them, 1.8 % FeOOH/BiOBr has the highest photo-Fenton catalytic activity. The main reason is that the interface effect between FeOOH and BiOBr can enable photogenerated electrons to rapidly transfer from the surface of BiOBr to FeOOH to participate in the Fe 3+ /Fe 2+ cycle. Meanwhile, the quantum size of FeOOH increases the density of active sites on the surface of the composite catalyst. The influence of external factors on the catalytic activity of the catalyst was also verified. Finally, the electron transfer direction and main active species (h + , ⋅O 2 − ) of the composite catalyst were discussed by electrochemical analysis and radical trapping experiments, and a reasonable catalytic degradation mechanism was proposed.