Table 3: Cd2+ ions RE and qe at different adsorbent dosages by D. regia.
| Adsorbent dosage (mg) | Ce (mg/L) | Cd2+ ions | qe (mg/g) |
| ±SD | RE% ±SD | ±SD | |
| 25 | 2.84 ± 0.08 | 85.79 ± 0.09 | 34.32 ± 0.16 |
| 50 | 2.22 ± 0.06 | 88.90 ± 0.31 | 17.98 ± 0.17 |
| 100 | 1.88 ± 0.03 | 90.54 ± 0.22 | 9.05 ± 0.10 |
| 200 | 1.77 ± 0.01 | 91.10 ± 0.31 | 4.56 ± 0.09 |
| 300 | 1.36 ± 0.03 | 93.21 ± 0.17 | 3.11 ± 0.06 |
| 400 | 1.24 ± 0.02 | 93.80 ± 0.07 | 2.35 ± 0.05 |
| 500 | 1.04 ± 0.01 | 94.82 ± 0.05 | 1.90 ± 0.01 |