Research Article
Modeling the Sorption of Ni2+ and Co2+ on Saprist Peat Using the Response Surface Methodology
Table 2
Values of design variables and percentages of metals removed that were used in the Box-Behnken analysis.
| | Run number | Actual factors | Metal removed, % | | | | | Co2+ | Ni2+ | | Conc. (mg/L) | Peat dose (g/L) | Time (h) | pH |
| | 1 | 50 | 2 | 18 | 6.5 | 45.0 | 98.0 | | 2 | 200 | 2 | 18 | 6.5 | 30.0 | 58.7 | | 3 | 50 | 40 | 18 | 6.5 | 93.8 | 98.8 | | 4 | 200 | 40 | 18 | 6.5 | 84.6 | 99.6 | | 5 | 125 | 21 | 12 | 3 | 77.2 | 93.0 | | 6 | 125 | 21 | 24 | 3 | 78.7 | 94.4 | | 7 | 125 | 21 | 12 | 10 | 94.6 | 23.7 | | 8 | 125 | 21 | 24 | 10 | 94.8 | 26.2 | | 9 | 50 | 21 | 18 | 3 | 86.4 | 94.0 | | 10 | 200 | 21 | 18 | 3 | 73.6 | 79.7 | | 11 | 50 | 21 | 18 | 10 | 96.2 | 32.8 | | 12 | 200 | 21 | 18 | 10 | 93.5 | 23.4 | | 13 | 125 | 2 | 12 | 6.5 | 36.3 | 69.9 | | 14 | 125 | 40 | 12 | 6.5 | 87.9 | 99.6 | | 15 | 125 | 2 | 24 | 6.5 | 33.4 | 70.8 | | 16 | 125 | 40 | 24 | 6.5 | 88.9 | 83.6 | | 17 | 50 | 21 | 12 | 6.5 | 89.6 | 95.5 | | 18 | 200 | 21 | 12 | 6.5 | 78.8 | 80.5 | | 19 | 50 | 21 | 24 | 6.5 | 90.4 | 96.1 | | 20 | 200 | 21 | 24 | 6.5 | 74.0 | 87.3 | | 21 | 125 | 2 | 18 | 3 | 33.1 | 31.7 | | 22 | 125 | 40 | 18 | 3 | 87.3 | 97.3 | | 23 | 125 | 2 | 18 | 10 | 54.9 | 17.5 | | 24 | 125 | 40 | 18 | 10 | 95.7 | 30.4 | | 25 | 125 | 21 | 18 | 6.5 | 81.3 | 78.8 | | 26 | 125 | 21 | 18 | 6.5 | 78.6 | 88.9 | | 27 | 125 | 21 | 18 | 6.5 | 80.7 | 91.4 | | 28 | 125 | 21 | 18 | 6.5 | 80.2 | 90.2 | | 29 | 125 | 21 | 18 | 6.5 | 79.4 | 99.7 |
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