Heavy Metal Adsorption onto Kappaphycus sp. from Aqueous Solutions: The Use of Error Functions for Validation of Isotherm and Kinetics Models

Table 3

Biosorption isotherm model parameters for the metal ions biosorption onto Kappaphycus sp. dried biomass.

Model	Parameter	Metal ion
		Pb^2+	Cu^2+	Fe^2+	Zn^2+
Langmuir	(mg g^−1)	22.17	19.49	16.92	16.23
	(L mg^−1)	0.0676	0.0728	0.073	0.0561
		0.37–0.07	0.35–0.06	0.35–0.06	0.41–0.08
		0.995	0.993	0.997	0.986
Freundlich	(mg g^−1) (L mg^−1	3.836	4.000	3.491	3.164
		2.744	3.091	3.104	3.121
		0.986	0.984	0.934	0.938
Temkin	(L mg^−1)	1.037	1.397	1.228	1.056
	(kJ mol^−1)	596.703	720.350	800.999	853.158
		0.991	0.995	0.989	0.967
D-R	(mg g^−1)	15.58	14.33	13.22	12.16
	(mol^2 kJ^−2)	2.284	2.224	4.773	5.768
		0.773	0.799	0.894	0.865
	(kJ mol^−1)	0.468	0.474	0.324	0.294