Effective Remediation of Lead Ions from Aqueous Solution by Chemically Carbonized Rubber Wood Sawdust: Equilibrium, Kinetics, and Thermodynamic Study

Table 2

A pseudo-first-order, pseudo-second-order, and intraparticle diffusion model parameter for adsorption of lead ion onto CCRWSD.

Constants	Initial concentration (mg/L)
	5	10	15	20
(mg/g)	9.82	19.31	28.05	35.8
Pseudo-first order
(mg/g)	7.58	16.52	27.29	31.87
(min^−1)	0.0283	0.0377	0.0301	0.0458
	0.991	0.995	0.984	0.990
Pseudo-second order
(mg/g)	10.12	2.02	3.26	37.45
(g mg^−1 min^−1)	0.016	0.600	0.199	0.004
	0.998	0.995	0.988	0.998
Intraparticle diffusion
(g mg^−1 min^−1)	0.709	1.488	2.294	2.763
	0.873	0.895	0.926	0.872