<p>The increasing discharge of persistent and toxic organic dyes into industrial wastewater necessitates the development of efficient, economical, and environmentally sustainable treatment strategies. In this study, a high-performance photocatalyst was synthesized as a ternary TiO₂–ZnO/Graphene Oxide (NC ZnO) nanocomposite. The novelty of this work lies in the strategic combination of TiO₂ and ZnO nanoparticles onto high-surface-area graphene oxide (GO) sheets, forming a Type-II heterojunction that effectively suppresses the rapid recombination of photoinduced electron–hole pairs and enhances charge separation efficiency. The NC ZnO was synthesized via the sol–gel method because it is superior at achieving molecular-level homogeneity and controlling the morphology of the metal oxides at low processing temperatures, which is critical for preserving the integrity of the GO nanosheets. Furthermore, Moringa oleifera seed extract was utilized as a natural reducing and stabilizing agent, introducing a green and sustainable synthesis route. Comprehensive characterization of NC ZnO confirmed the successful formation of the ternary heterostructure. Hexagonal wurtzite structure, crystallinity, and functional groups of the samples were characterized via X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). The photocatalytic activity of the optimized NC ZnO was evaluated for the degradation of Methylene Blue (MB) and Carbol Fuchsin (CF) dyes under visible light irradiation, achieving degradation efficiencies of 75% and 72%, respectively, within 90&#xa0;min. The developed NC ZnO nanocomposite thus represents a promising, cost-effective, and eco-friendly photocatalyst for the efficient remediation of dye-polluted industrial effluents.</p>