Photocatalytic Properties of Nitrogen-Doped Bi₁₂TiO₂₀ Synthesized by Urea Addition Sol-Gel Method

Figure 3

XPS absorption spectra of bismuth titanate Bi₁₂TiO_20−𝑦N_𝑦(𝑦=0.03): (a) the whole spectrum of Bi₁₂TiO_20−𝑦N_𝑦(𝑦=0.03); (b) spectrum of doped nitrogen; (c) spectrum of doped carbon.

(a)

(b)

(c)