Highly efficient recyclable photocatalysts of ternary g-C₃N₄-ZnO/Cu₂O nanocomposite were designed for photo-degradation of RhB dye. The structural, morphological, surface structure and optical properties of the as-prepared nanocomposites (NCs) were characterized by XRD, FT-IR, FE-SEM with EDS, HRTEM, XPS, BET, UV–Vis DRS and PL spectra analysis respectively. The photo-degradation efficiencies of RhB dye over the g-C₃N₄, g-C₃N₄/ZnO, g-C₃N₄/Cu₂O and g-C₃N₄-ZnO/Cu₂O photocatalysts (PCs) were 36.4%, 53% and 66%, and 91.4% in 100 min under visible-light. The as-obtained g-C₃N₄-ZnO/Cu₂O PCs was remarkably upgraded the photo-degradation efficiency rate than to other samples. Also, the heterojunction formation among the g-C₃N₄ and ZnO/Cu₂O interfaces due to the development of visible-light absorption capability and photo-excited charge separation efficiency which was improved the photocatalytic performance. Besides, the g-C₃N₄-ZnO/Cu₂O PCs exhibit a greater photo-degradation performance after five successive reuses. Hence, the eco-friendly PCs might be widely useful for the application of dye polluted wastewater treatment.

三元gC ₃ N ₄ -ZnO/Cu ₂ O纳米复合材料的高效可回收光催化剂被设计用于RhB染料的光降解。通过XRD、FT-IR、FE-SEM与EDS、HRTEM、XPS、BET、UV-Vis DRS和PL光谱分析分别对所制备的纳米复合材料（NCs）的结构、形态、表面结构和光学性质进行了表征。RhB染料对gC ₃ N ₄、gC ₃ N ₄ /ZnO、gC ₃ N ₄ /Cu ₂ O和gC ₃ N ₄ -ZnO/Cu ₂的光降解效率O 光催化剂（PCs）在可见光下 100 分钟内分别为 36.4%、53% 和 66% 以及 91.4%。所获得的gC ₃ N ₄ -ZnO/Cu ₂ O PCs 的光降解效率比其他样品显着提高。此外，由于可见光吸收能力和光激发电荷分离效率的发展，gC ₃ N ₄和ZnO/Cu ₂ O界面之间形成异质结，提高了光催化性能。此外，gC ₃ N ₄ -ZnO/Cu ₂在连续五次重复使用后，O PC 表现出更大的光降解性能。因此，环保 PC 可能广泛用于染料污染废水处理的应用。