Table 5. Experimental Design According to BBD and Experimental and Predicted Values of Adsorption Efficiency (%) (Number of Independent Parameters: 3; Number of Runs: 15; and Number of Center Points: 3).
| adsorption
efficiency |
|||||
|---|---|---|---|---|---|
| run | pH | amount (mg) | time (min) | experimental (%) | predicted (%) |
| 1 | 4.0 | 200 | 25 | 80.0 | 77.75 |
| 2 | 9.0 | 1000 | 25 | 26.0 | 28.25 |
| 3 | 9.0 | 600 | 45 | 29.0 | 30.33 |
| 4 | 6.5 | 600 | 25 | 84.0 | 84.07 |
| 5 | 9.0 | 600 | 5 | 1.0 | 0.00 |
| 6 | 4.0 | 600 | 45 | 96.0 | 100.68 |
| 7 | 6.5 | 200 | 45 | 74.0 | 71.58 |
| 8 | 6.5 | 600 | 25 | 80.0 | 84.07 |
| 9 | 6.5 | 1000 | 5 | 48.0 | 50.43 |
| 10 | 4.0 | 1000 | 25 | 95.4 | 94.30 |
| 11 | 6.5 | 600 | 25 | 88.2 | 84.07 |
| 12 | 6.5 | 1000 | 45 | 92.0 | 88.43 |
| 13 | 9.0 | 200 | 25 | 10.0 | 11.10 |
| 14 | 6.5 | 200 | 5 | 30.0 | 33.58 |
| 15 | 4.0 | 600 | 5 | 60.0 | 58.68 |