Models	Parameter	Iron Oxide	Goethite	Models
Pseudo-first order	R²	Co(II)	0.9652	0.7745
	R²	Ni(II)	0.8529	0.155
	K₁	Co(II)	0.0636	0.0008
	K₁	Ni(II)	0.0385	0.0003
Pseudo-second order	R²	Co(II)	0.9887	0.9984
	R²	Ni(II)	0.9936	0.9964
	h_o (mg/g min)	Co(II)	81.3	43.86
	h_o (mg/g min)	Ni(II)	18.15	769
	K₂ (g/mg min)	Co(II)	0.010	0.004
	K₂ (g/mg min)	Ni(II)	0.003	0.114
	Q_e	Co(II)	88.50	105.26
	Q_e	Ni(II)	81.97	81.97
Elovich	R²	Co(II)	0.8886	0.8392
	R²	Ni(II)	0.8309	0.3752
	β (g/mg)	Co(II)	0.0693	0.1421
	β (g/mg)	Ni(II)	0.0888	0.2264
	α (mg/g min)	Co(II)	123.91	157494
	α (mg/g min)	Ni(II)	150.33	77 × 10⁵