Improvement of Orange II Photobleaching by Moderate Ga³⁺ Doping of Titania and Detrimental Effect of Structural Disorder on Ga Overloading

Table 2

Rate constant and degree of degradation Orange II dye (90 min.).

Sample	Band-gap (eV)	𝑘 365 nm (min^−1)	Degree of bleaching (%)	𝑘 400 nm (min^−1)	Degree of bleaching (%)	200°C; 𝑘 365 nm (min^−1)	200°C; 𝑘 400 nm (min^−1)
TiGa001	3.10	0.02989	98.5	0.00536	43.9	0.02478	0.00463
TiGa005	3.12	0.01965	82.3	0.00567	45.9	0.03422	0.0047
TiGa010	3.15	0.08447	100*	0.01451	83.1	0.05564	0.00632
TiGa020	3.22	0.08425	100*	0.00833	79.1	0.05226	0.00591
TiGa050	3.21	0.03011	99.1	0.00456	38.9	0.02417	0.00345
TiGa080	3.20	0.01153	67.2	0.00267	23.6	0.01619	0.00398
TiGa100	3.20	0.00769	52.7	0.00186	16.2	0.01406	0.00376
TiGa120	3.20	0.00438	34.6	0.00349	29.2	0.01570	0.00361

Time reaction ∗29 min, **34 min.