Effect of Different Calcination Temperatures on the Structural and Photocatalytic Performance of Bi-TiO₂/SBA-15

Figure 4

XPS survey spectrum of Bi-TiO₂/SBA-15 (a), the high-resolution XPS spectra of Bi 4f region (b), O 1s (c), and Ti 2p (d).

(a)

(b)

(c)

(d)