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

Table 1

Removal efficiency of Pb²⁺ and Cd²⁺ for the HAp/chitosan hybrid fibers with different HAp contents. For comparison, the removal efficiency for the chitosan fiber is also presented. The initial concentration of Pb²⁺ and Cd²⁺ was 10 mg/L for all tests.

	Pb^2+		Cd^2+
	Residual concentration (mg/L)	Removal efficiency (%)	Residual concentration (mg/L)	Removal efficiency (%)
Chitosan fiber	5.30	47.0	7.78	22.2
10/90; HAp/chitosan fiber	0.27	97.3	0.56	94.4
20/80; HAp/chitosan fiber	0.08	99.2	0.14	98.6
30/70; HAp/chitosan fiber	0.08	99.2	0.05	99.5