Enhanced Photocatalytic Activity of W-Doped and W-La-Codoped TiO₂ Nanomaterials under Simulated Sunlight

Figure 7

(a) Decolorization profiles of MO in the presence of (A) pure TiO₂, (B) 0.8% W/TiO₂, and (C) 4% La/W/TiO₂ in the dark. Photocatalytic decolorization curves of MO over the catalysts under simulated sunlight irradiation: (A) blank, (B) P25, (C) pure TiO₂, (D) 0.4% W/TiO₂, (E) 0.6% W/TiO₂, (F) 0.8% W/TiO₂, (G) 1.0% W/TiO₂, and (H) 1.2% W/TiO₂ in (b) and (A) 0.8% W/TiO₂, (B) 1% La/W/TiO₂, (C) 2% La/W/TiO₂, (D) 3% La/W/TiO₂, (E) 4% La/W/TiO₂, and (F) 5% La/W/TiO₂ in (c). (d) PL spectra of the (A) pure TiO₂, (B) 0.8% W/TiO₂, and (C) 4% La/W/TiO₂ nanomaterials.

(a)

(b)

(c)

(d)