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

Table 4

Pseudo-second-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-second-order
			(mg/g)^b	(g/mg/h)
Pb^2+	10	1.99	1.99	61.21	1
	100	19.98	20.00	6.80	1
	1000	151.29	159.49	0.03	0.998
Cd^2+	10	1.95	2.04	6.86	1
	100	19.91	20.57	0.29	0.999
	1000	85.50	90.25	0.04	0.994

Determined experimentally via (1).
^bDetermined from Figure 7 via (7).