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