Table 5 Sorption and elution process parameters for seven sorption–desorption cycles.
From: Elution profile of cationic and anionic adsorbate from exhausted adsorbent using solvent desorption
Adsorbate | Cycle no | Update capacity (mg/g) | tb (min) | te (min) | ∆t (min) | dC/dt (mg/l h) | Z (cm) | Zm (cm) | Percent removal (%) | Elution efficiency (%) |
|---|---|---|---|---|---|---|---|---|---|---|
Congo Red dye | 1 | 70.0 | 42.5 | 65 | 22.5 | 8.5 | 10.0 | 6.3 | 85.5 | 99.4 |
2 | 68.5 | 34.8 | 60 | 25.2 | 7.9 | 9.9 | 6.4 | 78.8 | 99.1 | |
3 | 67.9 | 29.9 | 57.4 | 27.5 | 7.1 | 9.6 | 6.4 | 72.5 | 98.8 | |
4 | 67.0 | 22.5 | 55.1 | 32.6 | 5.7 | 9.0 | 6.6 | 67.9 | 98.8 | |
5 | 66.6 | 17.4 | 52.6 | 35.2 | 5.6 | 8.7 | 6.9 | 62.5 | 98.4 | |
6 | 65.2 | 9.5 | 47.6 | 38.1 | 4.5 | 8.4 | 6.9 | 58.5 | 97.8 | |
7 | 64.8 | 1.1 | 40 | 38.9 | 3.3 | 8.0 | 7.2 | 56.3 | 97.5 | |
Cadmium metal | 1 | 25.0 | 44.4 | 67.8 | 23.4 | 8.1 | 10.0 | 6.4 | 88.8 | 99.7 |
2 | 24.8 | 32.4 | 62.7 | 30.3 | 7.8 | 9.8 | 6.4 | 86.5 | 99.3 | |
3 | 24.2 | 26.5 | 57.6 | 31.1 | 7.1 | 9.6 | 6.6 | 82.2 | 98.5 | |
4 | 23.7 | 21.5 | 55.1 | 33.6 | 6.5 | 9.6 | 6.6 | 78.5 | 98.0 | |
5 | 23.1 | 17.6 | 52.9 | 35.3 | 4.2 | 9.0 | 6.8 | 72.2 | 97.8 | |
6 | 22.4 | 12.6 | 50.1 | 37.5 | 3.8 | 8.9 | 7.0 | 68.8 | 97.3 | |
7 | 22.0 | 7.5 | 45.8 | 38.3 | 2.9 | 8.7 | 7.2 | 60.5 | 97.0 |
