Fabrication of Al-Doped TiO₂ Visible-Light Photocatalyst for Low-Concentration Mercury Removal

Figure 5

Ti_2p XPS spectra of TiO₂ synthesized at Al₂O₃/Ti mass ratio of (a) 0, (b) 0.1, (c) 0.3, and (d) 0.5.

(a)

(b)

(c)

(d)