Removal of Zn (II) and Cu (II) Ions from Industrial Wastewaters Using Magnetic Biochar Derived from Water Hyacinth

Table 2

Langmuir and Freundlich constants for the metal ions adsorption on Fe₂O₃-EC.

Adsorbent	Adsorbate	Langmuir			Freundlich
				R^2		n	R^2
		(mg g^−1)	(L mg^−1)		(mg g^−1)
Fe2O3-EC	Cu^2+	3.53	5.916	0.998	3.31	1.69	0.987
	Zn^2+	9.42	0.314	0.995	3.85	1.12	0.907
EC	Cu^2+	2.06	6.83	0.980	2.58	1.99	0.978
	Zn^2+	5.99	5.71	0.992	5.89	1.53	0.966