Table 2 Individual factor values for the adsorption experiment
Factor | pH | Adsorbent dose (g) | Contact time (min) | Initial Cr (VI) concentration |
|---|---|---|---|---|
1 | 4, 4.5, 5, 5.5, 6 | 2 | 90 | 2.25 |
2 | 5 | 1, 1.5, 2, 2.5, 3 | 90 | 2.25 |
3 | 5 | 2 | 60, 75, 90, 105, 120 | 2.25 |
4 | 5 | 2 | 90 | 0.5, 1.5, 2.25, 3.5, 4 |