Fig. 6

a The relative concentration (C_t/C₀) of MO versus time under light irradiation in the absence and presence of various photocatalysts: ZnO, Cu₂O (pH 10, 20 min), CuSCN (3D), NiO (1 min), Cu₂O (pH 10, 20 min)/ZnO, ZnO/CuSCN (3D), and ZnO/NiO(1 min); b The UV-vis absorption spectra of MO aqueous solution with different photocatalysts: ZnO, Cu₂O (pH 10, 20 min), CuSCN (3D), NiO (1 min), Cu₂O (pH 10, 20 min)/ZnO, ZnO/CuSCN (3D), and ZnO/NiO(1 min)