Photocatalytic Decolourization of Direct Yellow 9 on Titanium and Zinc Oxides

Figure 2

Isotherms of the adsorption process of DY9 on the TiO₂ (a.A) and ZnO (b.A) surface. Linear Freundlich ((a.B) and (b.B) for TiO₂ and ZnO, resp.) and Langmuir ((a.C) and (b.C) for TiO₂ and ZnO, resp.) adsorption isotherm of DY9 on the photocatalyst surface.

(a)

(b)