[Retracted] Methylene Blue Dye Photodegradation during Synthesis and Characterization of WO₃ Nanoparticles

Figure 8

XPS image of prepared WO₃ nanoparticles (a) wide, (b) O1s, (c) C1s, and (d) W4f.

(a)

(b)

(c)

(d)