Table 4 Collective data of apparent rate constants, half life times and reaction orders for photocatalytic degradation of acid red 37 dye.
Catalytic system | Concentration | kapp (min−1) | t1/2 (min) | Apparent reaction order (n) |
|---|---|---|---|---|
UV/SnO2 (g/L) | 0.4 | 2 × 10−4 | 3460 | – |
UV/TiO2 (g/L) | 28 × 10−4 | 247.1 | ||
UV/TiO2–SnO2 (97:3) (g/L) | 38 × 10−4 | 182.1 | ||
UV/TiO2–SnO2 (90:10) (g/L) | 72 × 10−4 | 96.1 | ||
UV/TiO2–SnO2 (80:20) (g/L) | 35 × 10−4 | 197.7 | ||
UV/TiO2–SnO2 (90:10) wt% (0.4 g/L)/H2O2 (M) | 2 × 10−2 | 789 × 10−4 | 8.7 | 2.3 |
3 × 10−2 | 883 × 10−4 | 7.8 | ||
4 × 10−2 | 943 × 10−4 | 7.3 | ||
6 × 10−2 | 997 × 10−4 | 6.9 | ||
8 × 10−2 | 698 × 10−4 | 9.9 | ||
UV/TiO2–SnO2 (90:10) wt% (0.4 g/L)/S2O82− (M) | 1 × 10−3 | 166 × 10−4 | 41.7 | 0.5 |
3 × 10−3 | 273 × 10−4 | 25.3 | ||
5 × 10−3 | 371 × 10−4 | 18.6 | ||
7 × 10−3 | 826 × 10−4 | 8.3 | ||
10 × 10−3 | 2352 × 10−4 | 2.9 | ||
UV/TiO2–SnO2 (90:10) wt% (0.4 g/L)/IO4− (M) | 1.0 × 10−4 | 251 × 10−4 | 27.6 | 2.9 |
1.5 × 10−4 | 310 × 10−4 | 22.3 | ||
2.5 × 10−4 | 376 × 10−4 | 18.4 | ||
5.0 × 10−4 | 638 × 10−4 | 10.8 | ||
1 × 10−3 | 1214 × 10−4 | 5.7 |
