Factors and corresponding levels in the experimental design.
| Factors | −1 (low level) | +1 (high level) |
|---|---|---|
| Photocatalyst | Ti-A | Ti-B |
| Electron scavenger (FeCl2) | 0 | 15 mL |
| H2O2 | 0 | 1 mL |
| Factors | −1 (low level) | +1 (high level) |
|---|---|---|
| Photocatalyst | Ti-A | Ti-B |
| Electron scavenger (FeCl2) | 0 | 15 mL |
| H2O2 | 0 | 1 mL |