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Process variables with their values.
| Variables | Unit | Level 1 | Level 2 | Level 3 |
|---|---|---|---|---|
| Adsorbent dosage | mg | 100 | 200 | 300 |
| MG concentration | mg L−1 | 6 | 8 | 10 |
| AO concentration | mg L−1 | 6 | 8 | 10 |
| Ionic strength | (w/v%) | 0 | 3 | 6 |
| pH of the solution | – | 4 | 6 | 8 |
| Temperature | °C | 25 | 27 | 30 |
| Sonication time | min | 3 | 6 | 9 |
