Eco-Efficient Biosorbent Based on Leucaena leucocephala Residues for the Simultaneous Removal of Pb(II) and Cd(II) Ions from Water System: Sorption and Mechanism

Table 1

Kinetics parameter of Pb(II) and Cd(II) removal in both mono- and bicomponent systems by different volumes of LLEPs.

mLLEPs (g)	Metallic ions	Pseudo-second-order				Pseudo-first-order			Elovich model
		(cal)	(exp)			(cal)
0.1	Single removal
	Pb^2+	8.203	8.199	0.007	0.999	1.497	0.004	0.814	0.008	0.288	0.584
	Cd^2+	6.887	6.844	0.007	0.999	1.105	0.002	0.957	0.003	0.267	0.954
	Simultaneous removal
	Pb^2+	8.025	8.021	0.006	0.999	1.476	0.004	0.814	0.009	0.282	0.584
	Cd^2+	6.447	6.404	0.007	0.999	1.029	0.002	0.959	0.043	0.250	0.954
0.5	Single removal
	Pb^2+	2.008	2.003	0.042	0.999	0.192	0.002	0.908	4.329	0.043	0.906
	Cd^2+	1.588	1.589	0.285	0.999	0.022	0.002	0.461	13.70	0.016	0.686
	Simultaneous removal
	Pb^2+	1.872	1.869	0.204	0.999	0.044	0.002	0.995	12.83	0.013	0.947
	Cd^2+	1.530	1.525	0.101	0.999	0.088	0.002	0.979	10.06	0.026	0.960
0.9	Single removal
	Pb^2+	1.243	1.242	0.798	0.999	0.011	0.002	0.995	94.10	0.003	0.996
	Cd^2+	1.118	1.117	1.427	0.999	0.005	0.002	0.961	184.6	0.002	0.967
	Simultaneous removal
	Pb^2+	1.201	1.200	0.748	0.999	0.012	0.002	0.946	54.59	0.006	0.795
	Cd^2+	1.055	1.054	0.278	0.999	0.033	0.002	0.931	39.88	0.009	0.927