Controllable Fabrication of Ordered Mesoporous Bi₂WO₆ and Its High Photocatalytic Activity under Visible Light

Figure 4

(a) UV-vis absorption spectra of Bi₂WO₆, S₁, S_2, and S₃ and (b) calculation of the band gap by Bi₂WO₆ and S₂ by Kubelka-Munk function.

(a)

(b)