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| Factor | Coding | Unit | Level coding value of each factor | ||
|---|---|---|---|---|---|
| −1 | 0 | 1 | |||
| Adsorption time | A | h | 4 | 5 | 6 |
| Adsorbent dosage | B | mg L−1 | 70 | 80 | 90 |
| pH | C | 8 | 9 | 10 | |
| Temperature | D | °C | 25 | 35 | 45 |
| Sb(iii) initial concentration | E | mg L−1 | 10 | 20 | 30 |
