Nanocrystalline N-Doped TiO₂ Powders: Mild Hydrothermal Synthesis and Photocatalytic Degradation of Phenol under Visible Light Irradiation

Figure 3

(a) UV-Visible absorption spectra of undoped and N-doped TiO₂ powders and (b) plots of (αhν)^0.5 versus photoenergy of the synthesized samples.

(a)

(b)