Improved Visible Light Photocatalytic Activity for TiO₂ Nanomaterials by Codoping with Zinc and Sulfur

Figure 8

(a) Photocatalytic degradation curves of X-3B over different samples. The initial concentration of X-3B solution was 20 mg/L for (a) and 40 mg/L for (b) and (c).

(a)

(b)

(c)