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

Figure 3

(a) XPS survey of Cu-doped ZnO NPs, (b) Zn 2p peaks (high resolution), (c) Cu 2p peaks (high resolution), and (d) O 1s peak.

(a)

(b)

(c)

(d)