Fig. 5.

a Photocatalytic degradation of MB under visible light illumination. b Photocatalytic degradation of MB by Bi₂O₂CO₃ at different wavelength. c C_t/C₀ versus time with various concentrations of methylene blue by Bi₂O₂CO₃. d Langmuir–Hinshelwood plot (L–H) for photocatalytic degradation of methylene blue using Bi₂O₂CO₃ (solid line is the model fitting and solid circles are experimental data). e Photodegradation of MB over Bi₂O₂CO₃ and Bi–Bi₂O₂CO₃ under conventional condition, presence of H₂O₂ and N₂ into the solution. f A recyclability study of Bi–Bi₂O₂CO₃ under visible light illumination