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

Table 2

Isotherm parameters for adsorption of Pb²⁺ and Cd²⁺ by HAp/chitosan hybrid fibers with different HAp contents.

Metal ions	HAp/chitosan	Langmuir constants			Freundlich constants
		(mg/g)	(L/mg)		(mg/g (mg/L))
Pb^2+	10/90	103.84	0.097	0.994	16.63	3.07	0.508
	20/80	126.26	0.153	0.945	21.90	2.87	0.624
	30/70	132.10	0.477	0.923	34.36	3.56	0.429
Cd^2+	10/90	62.15	0.035	0.995	4.18	2.23	0.880
	20/80	72.25	0.025	0.953	5.00	2.29	0.938
	30/70	81.10	0.027	0.903	9.04	2.84	0.735