BiOBr/g-C3N4/CoFe2O4的制备及其光催化降解性能OACHSSCD

Graphitic carbon nitride(g-C3N4)has several limitations as a photocatalyst.It shows weak absorption of visible light,a small specific surface area,and a high recombination rate of photogenerated electron-hole pairs.Therefore,a Type Ⅱ-Z-scheme heterojunction photocatalyst was prepared by combining g-C3N4 with BiOBr and CoFe2O4.This design overcomes the above limitations while retaining high oxidation and reduction potentials,which facilitate redox reactions.The effects of degradation conditions on the photocatalytic removal of tetracycline hydrochloride(TCH)were also investigated.The results indicate that BiOBr/g-C3N4/CoFe2O4 achieves a degradation rate of 84.6％for TCH after 240 min of visible-light irradiation.Its performance is significantly better than that of the individual components and binary composites.The enhanced photocatalytic activity is attributed to the type Ⅱ-Z-scheme,increased specific surface area,improved visible light absorption in the 400-800 nm range,and the synergistic effect of the layered g-C3N4 structure.The degradation of TCH over BiOBr/g-C3N4/CoFe2O4 follows a pseudo-first-order kinetic equation,and its apparent rate constant at each stage is higher than that of other single or composite materials.Under experimental conditions,the degradation performance improves with higher photocatalyst dosage and lower initial mass concentration of TCH.However,cations,anions,and different water sources all inhibit the degradation of TCH.Additionally,BiOBr/g-C3N4/CoFe2O4 exhibits good stability and demonstrates excellent degration capabilities towards other organic pollutants such as Rhodamine B(RhB),indicating broad application potential.