| [TiO2] (mg/L) | k1 × 10−3 | [ZnO] (mg/L) | k2 × 10−3 |
| zero (photolysis) | 140 | zero (photolysis) | 140 |
| 50 | 175 | 50 | 181 |
| 100 | 382 | 100 | 326 |
| 250 | 390 | 250 | 366 |
| 500 | 422 | 500 | 390 |