Removal of Lead (II) Ions from Aqueous Solutions onto Activated Carbon Derived from Waste Biomass

Table 1

Kinetic parameters for the adsorption of lead (II) ions onto the activated carbon (SAC2).

Temperature (K)	298.15	308.15	318.15
Pseudo-first-order
k 1 (min^−1)	0.023	0.020	0.017
q 1 (mg g^−1)	73.55	79.84	92.29
𝑟^21	0.980	0.928	0.921
Pseudo-second-order
k 2 (g mg^−1 min^−1)	11.6 × 10^−4	10.96 × 10^−4	9.26 × 10^−4
q 2 (mg g^−1)	238.1	250.0	263.2
𝑟^22	0.9995	0.9993	0.9994
Intraparticle diffusion
𝑘𝑝 (mg g min^−1/2)	8.7429	9.9775	11.319
𝐶	153.74	152.85	154.53
𝑟^2𝑝	0.9390	0.8791	0.8659