Photocatalytic Activity under Simulated Sunlight of Bi-Modified TiO₂ Thin Films Obtained by Sol Gel

Table 2

Effect of bismuth content on the band gap energy.

Bismuth content; (at. %)	Band gap energy; (eV)
0	3.3
0.5	3.3
4.9	3.2
10.4	3.1
21.5	2.9
25.4	2.7