| [TiO2] (mg/L) | k1 × 10−3 | [ZnO] (mg/L) | k2 × 10−3 |
| zero (photolysis) | 31 | zero (photolysis) | 31 |
| 50 | 78 | 50 | 75 |
| 100 | 97 | 100 | 81 |
| 250 | 133 | 250 | 94 |
| 500 | 155 | 500 | 113 |