Table 9: Kinetic parameters of Cd2+ ions adsorption onto D. regia.
Co (mg/L) | Pseudo-first-order kinetics | Pseudo-second-order kinetics | Observed qe (mg/g) ±SD | ||||
k1 (1/min) ±SD | qe (mg/g) ±SD | R2 | k2 (g/mg.min) ±SD | qe (mg/g) ±SD | R2 | ||
10 | 0.12 ± 0.01 | 0.99 ± 0.03 | 0.98 | 0.97 ± 0.04 | 1.60 ± 0.06 | 0.999 | 1.57 ± 0.05 |
30 | 0.08 ± 0.003 | 1.65 ± 0.05 | 0.61 | 0.49 ± 0.02 | 4.73 ± 0.04 | 0.999 | 4.71 ± 0.04 |
50 | 0.14 ± 0.02 | 13.37 ± 0.09 | 0.93 | 0.14 ± 0.01 | 7.69 ± 0.08 | 0.998 | 7.59 ± 0.09 |