Table 1.
Crystallite size, BET surface area and photocatalytic performance of the as-prepared β-Bi2O3 samples
| Sample | Time [min][a] | Size [nm][b] | BET surface area [m2 g−1] | c/c0 of RhB [%][c] | k1 [s−1] |
|---|---|---|---|---|---|
| β-Bi2O3-5 | 5 | 17±2 (20±3) | 29 | 0 | 4.01×10−4 |
| β-Bi2O3-10 | 10 | 18±2 (21±3) | 29 | 0 | 4.01×10−4 |
| β-Bi2O3-30 | 30 | 23±2 (23±4) | 26 | 1 | 4.00×10−4 |
| β-Bi2O3-120 | 120 | 34±3 (33±4) | 20 | 2 | 3.71×10−4 |
| β-Bi2O3-180 | 180 | 40±4 (38±6) | 10 | 14 | 2.07×10−4 |
| β-Bi2O3-240 | 240 | 43±5 (n.m.)* | 7 | 16 | 1.97×10−4 |
| β-Bi2O3-300 | 300 | 45±5 (40±7) | 7 | 19 | 1.78×10−4 |
[a] Annealing time at 370 °C. [b] Crystallite size determined by Scherrer’s equation (PXRD) and TEM (values in brackets). [c] After 150 min. [*] n.m.=not measured.