[Retracted] Effect of Cu Doping on ZnO Nanoparticles as a Photocatalyst for the Removal of Organic Wastewater

Figure 2

Undoped and Cu-doped ZnO FE-SEM micrographs: (a) low and (b) high magnifications of pure ZnO and (c) low and (d) high magnifications of Cu-doped ZnO NPs.