Fig. 1. XRD pattern of g-C₃N₄-N sample

Fig. 2. FTIR spectra of g-C₃N₄ and g-C₃N₄-N photocatalysts

Fig. 3. Catalytic effect of g-C₃N₄-N in RhB solution under different pH conditions

Fig. 4. RhB catalysis under different g-C₃N₄-N dosages

Fig. 5. Catalytic activity of g-C₃N₄-N at different initial concentrations of RhB

Fig. 6. Dynamic change process of RhB absorption spectrum in photocatalytic degradation of g-C₃N₄-N

Fig. 7. Degradation pathway of RhB^[17]