Photocatalytic Decolourization of Direct Yellow 9 on Titanium and Zinc Oxides

Figure 4

Raman spectra of TiO₂ (a.A) and ZnO (b.A) after adsorption of DY9 and after 2 hours of irradiation under solar simulated light ((a.B) and (b.B), for TiO₂ and ZnO, resp.).

(a)

(b)