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

Table 7

Pseudo-second-order kinetic parameters for adsorption of Pb²⁺ and Cd²⁺ on 20/80 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	2.00	20.26	1
	100	19.95	21.24	0.18	0.988
	1000	137.00	161.29	0.01	0.983
Cd^2+	10	1.95	2.01	13.83	1
	100	18.53	22.54	0.07	0.969
	1000	72.61	81.90	0.04	0.995

Determined experimentally via (1).
^bDetermined from Figure 9 via (7).