Table 2

Metal	C₀ (mmol)	q_e,exp (mmol g^-1)	Pseudo-first-order			Pseudo-second-order
Metal	C₀ (mmol)	q_e,exp (mmol g^-1)	k₁ (min^-1)	q_e,cal (mmolg^-1)	R²	k² (g.mmol^-1min^-1)	q_e,cal (mmolg^-1)	R²
Copper	0.5	0.0609	0.013	0.0285	0.968	1.1690	0.0629	0.999
	1	0.0894	0.013	0.0362	0.955	1.0870	0.0917	0.999
	1.5	0.1014	0.017	0.0576	0.946	0.6277	0.1040	0.985
Nickel	0.5	0.0516	0.016	0.0171	0.843	1.4703	0.0527	0.999
	1	0.0756	0.024	0.0414	0.982	0.7514	0.0788	0.999
	1.5	0.0900	0.016	0.0508	0.952	0.6208	0.0942	0.999
Lead	0.5	0.0701	0.002	0.0312	0.947	1.5037	0.0708	0.999
	1	0.1011	0.009	0.0457	0.971	0.7973	0.1009	0.998
	1.5	0.1098	0.01	0.0356	0.968	0.9841	0.1119	0.999

Table 2: Kinetic parameters for the adsorption of Pb(II), Ni(II) and Cu(II) onto COSAC.