Engineering the Photocatalytic Behaviors of g/C₃N₄‐Based Metal‐Free Materials for Degradation of a Representative Antibiotic

Abstract

Abstract Graphitic carbon nitride (g/C 3 N 4 ) is of promise as a highly efficient metal‐free photocatalyst, yet engineering the photocatalytic behaviours for efficiently and selectively degrading complicated molecules is still challenging. Herein, the photocatalytic behaviors of g/C 3 N 4 are modified by tuning the energy band, optimizing the charge extraction, and decorating the cocatalyst. The combination shows a synergistic effect for boosting the photocatalytic degradation of a representative antibiotic, lincomycin, both in the degradation rate and the degree of decomposition. In comparison with the intrinsic g/C 3 N 4 , the structurally optimized photocatalyst shows a tenfold enhancement in degradation rate. Interestingly, various methods and experiments demonstrate the specific catalytic mechanisms for the multiple systems of g/C 3 N 4 ‐based photocatalysts. In the degradation, the active species, including ·O 2 − , ·OH, and h + , have different contributions in the different photocatalysts. The intermediate, H 2 O 2 , plays an important role in the photocatalytic process, and the detailed functions and originations are clarified for the first time.