The photocatalytic degradation of organic impurities is a promising eco-friendly system for wastewater treatment. Herein, the CuO coupled g-C₃N₄/TiO₂ ternary heterostructure nanocomposites (NCs) were effectively synthesized by facile hydrothermal strategy. The powder XRD, FT-IR, HR-TEM, FE-SEM with EDX, high-resolution XPS, UV–Vis DRS, BET and PL spectra analyses confirm the effective construction of g-C₃N₄/TiO₂/CuO heterostructure composite photocatalysts (PCs). The g-C₃N₄/TiO₂/CuO composite PCs displays photocatalytic enhanced performance for rhodamine B (RhB) dye decomposition than to pristine g-C₃N₄ PCs under simulated sunlight exposure. At optimum photocatalytic test conditions, the RhB dye was degraded (∼90.3%) within 120 min of light irradiation. No noticeable loss of photo-activity appeared after the five-succeeding recycle test. Moreover, the proposed S-scheme charge transfer mechanism based on scavenger's tests, the photocatalytic enhanced performance of optimum g-C₃N₄/TiO₂/CuO composite PCs is ascribed to the synergistic close interfacial contact, wide visible-light fascination, improved charge separation rate and actively inhibited the recombination rates of efficient e⁻/h⁺ pairs relatively.

有机杂质的光催化降解是一种很有前景的废水处理环保系统。在此，CuO 偶联的 gC ₃ N ₄ /TiO ₂三元异质结构纳米复合材料（NCs）是通过简便的水热策略有效合成的。粉末 XRD、FT-IR、HR-TEM、FE-SEM 与 EDX、高分辨率 XPS、UV-Vis DRS、BET 和 PL 光谱分析证实了 gC ₃ N ₄ /TiO ₂ /CuO 异质结构复合光催化剂的有效构建（件）。gC ₃ N ₄ /TiO ₂ /CuO 复合 PC 对罗丹明 B (RhB) 染料分解的光催化性能优于原始 gC₃ N ₄ PC 在模拟阳光照射下。在最佳光催化测试条件下，RhB 染料在光照射 120 分钟内降解（~90.3%）。在连续五次循环测试后没有出现明显的光活性损失。此外，基于清除剂测试提出的 S 型电荷转移机制，最佳 gC ₃ N ₄ /TiO ₂ /CuO 复合 PC的光催化增强性能归因于协同的紧密界面接触、宽的可见光迷恋、改进的电荷分离率并积极抑制有效 e ^- /h ⁺对的复合率。