<p>In recent days, photocatalytic wastewater in treatment has gained popularity in number of ways. Several organic contaminants in water can be smashed down by photocatalysis, which uses free sun light energy. Because photocatalytic technologies may provide high efficiencies and are reasonably priced, they have garnered interest due to their potential environmental benefits. In this work, we focused on the way β-CD may impact the photocatalytic performance of blended semiconductor nanocomposites (ZnO/TiO₂), (ZnO/CeO₂), (TiO₂/CeO₂), and (ZnO/CuO) and NR dye photocatalytic degradation by solar light irradiation is used to compare the photocatalytic degradation ability of all modified photocatalysts with that of bare semiconductors. A 4:1 weight ratio was employed when combining bare semiconductors to produce the blended composite. The Structural, optical and complexation pattern of β-CD with dye were investigated by XRD, FESEM, UV-DRS, FT-IR and UV–Vis spectral analysis. Investigations were carried out on factors such initial pollutant concentration, catalyst dosage, pH and irradiation duration. By measuring COD, the mineralization of NR dye was confirmed. In comparison to among all the photocatalysts, the modified nanocomposites (ZnO/TiO₂)-β-CD, (ZnO/CeO₂)-β-CD, (TiO₂/CeO₂)-β-CD and (ZnO/CuO)-β-CD were more effective in degrading of NR dye. These findings demonstrated the involvement of β-CD in the photocatalytic degradation of NR dye (ZnO/TiO₂), (ZnO/CeO₂), (TiO₂/CeO₂) and (ZnO/CuO), performing 2.2 times better than (ZnO/TiO₂), (ZnO/CeO₂), (TiO₂/CeO₂), (ZnO/CuO), and 4.9 times better than ZnO, TiO₂, CeO₂and CuO.</p>