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

Table 6

Pseudo-second-order kinetic parameters for adsorption of Pb²⁺ and Cd²⁺ on 10/90 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	1.95	1.96	27.64	1
	100	19.88	19.63	0.38	0.997
	1000	103.88	111.48	0.03	0.995
Cd^2+	10	1.89	1.96	3.52	0.998
	100	18.59	25.18	0.32	0.911
	1000	61.10	71.94	0.02	0.979

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