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Factorial design for the independent variables used along with the observed response.
| Run | Amount of adsorbent (g) | pH | Cr(III) removal (%) |
|---|---|---|---|
| 1 | 0.50 | 2.0 | 65.98 ± 0.36 |
| 2 | 0.75 | 2.0 | 77.96 ± 0.73 |
| 3 | 1.00 | 2.0 | 85.86 ± 0.12 |
| 4 | 0.50 | 3.0 | 87.76 ± 0.20 |
| 5 | 0.75 | 3.0 | 97.02 ± 0.19 |
| 6 | 1.00 | 3.0 | 99.19 ± 0.02 |
| 7 | 0.50 | 4.0 | 95.25 ± 0.77 |
| 8 | 0.75 | 4.0 | 98.79 ± 0.20 |
| 9 | 1.00 | 4.0 | 99.43 ± 0.07 |
