This study aimed to evaluate the ability of semiconductors such as TiO2, CuO, and ZnO that are utilized to remove the hazardous Alizarin organic dye of textile from aqueous solution. In this paper, Zinc oxide (ZnO), Copper oxide (CuO), and Titanium oxide (TiO2) nanoparticles were synthesized through a simple chemical process. In this study, the nano-powder of copper oxide was synthesized by the reaction of copper nitrate and citric acid, zinc oxide was synthesized by the reaction of citric acid and zinc nitrate by the sol-gel, and titanium oxide was synthesized by the reaction of industrial titanium dioxide with sodium hydroxide and finally, CuO/ZnO/TiO2 nanocomposite was synthesized by physical process. The structural properties of these nanoparticles and composite were characterized using X-ray diffraction (XRD), and Field Emission Scanning Electron Microscope (FE-SEM). We described the photocatalytic degradation of Alizarin dye solution using CuO/ZnO/TiO2 nanocomposite photocatalysts in the form of CuO/ZnO/TiO2 composite as a paint on the Stainless Steel cell, under ultraviolet (UV) irradiations. The effect of factors affecting the reaction such as the initial concentration of the two dyes, the effect of temperature, and the value of the acidic function was studied. The experimental results demonstrated that CuO/ZnO/TiO2 composite can remove the Alizarin red from wastewater by XRD and an average volume of copper oxide molecules by the formula of Debar Shearer found that it is equal to 21.33 nm. The particle size was found to be 18.13, 42.63, 20.48, and 20.48 nm for zinc oxide, titanium oxide, nano chemical mixture, and CuO/ZnO /TiO2 nanocomposite, respectively.