Experimental levels for p-nitrophenol adsorption.
| Variable | Factor | Unit | −1.68(α) | −1 | 0 | 1 | +1.68(α) |
|---|---|---|---|---|---|---|---|
| X 1 | pH | — | 2.63 | 4 | 6 | 8 | 9.36 |
| X 2 | Temperature | °C | 11.59 | 15 | 20 | 25 | 28.40 |
| X 3 | Concentration | mg L−1 | 39.90 | 44 | 50 | 56 | 60.09 |
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