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

Table 5

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

Model	Parameter	Metal ion
		Pb^2+	Cu^2+	Fe^2+	Zn^2+
	(mg g^−1)	2.106	2.0467	1.3554	0.5255
Pseudo-first-order	(min^−1)	0.035	0.0435	0.0454	0.0329
	(mg g^−1)	0.1456	0.1162	0.53	0.1262
		0.986	0.997	0.995	0.974
Pseudo-second-order	(g mg^−1 min^−1)	0.6133	0.9047	0.1771	0.5968
	(mg g^−1)	2.1159	2.0559	1.3999	0.535
	(mg g^−1 min^−1)	2.7457	3.8241	0.3471	0.1708
	(min)	0.7706	0.5376	4.0335	3.1322
		1.000	1.000	0.9999	0.9995
Elovich	(mg g^−1 min^−1)	5.67E + 21	1.62E + 22	62.4735	3276.307
	(g mg^−1)	27.6243	28.8184	7.9618	27.0124
		0.9845	0.9318	0.9753	0.8817
Intraparticle diffusion	(mg g^−1 min^−0.5)	0.0054	0.0099	0.0311	0.0112
	(mg g^−1)	2.0457	1.9636	1.0597	0.4142
		0.985	0.988	0.965	0.997