Removal of Cadmium and Lead from Aqueous Solution by Hydroxyapatite/Chitosan Hybrid Fibrous Sorbent: Kinetics and Equilibrium Studies

Table 3

Pseudo-first-order kinetic parameters for adsorption of Pb²⁺ and Cd²⁺ on 30/70 HAp/chitosan hybrid fiber.

Metal ions	Initial concentration (mg/L)	(mg/g)^a	Pseudo-first-order
			(mg/g)^b	(h^−1)
Pb^2+	10	1.99	0.03	0.49	0.439
	100	19.98	0.19	0.68	0.259
	1000	151.29	44.44	1.80	0.582
Cd^2+	10	1.95	ND^c	ND	ND
	100	19.91	4.90	0.80	0.700
	1000	85.50	24.73	0.48	0.181

Determined experimentally via (1).
^bDetermined from Figure 6 via (5).
^cNot determined.