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

Table 4

First- and second-order kinetic parameters for metal ion adsorption on biochars.

Adsorbent	Ion	(mg/g)	Pseudo- order			Pseudo- order
			(mg/g)	k1 (min^−1)	R^2	(mg/g)	k2 (g/mg min^−1)	R^2
EC	Cu^+2	2.46	2.30	0.045	0.974	2.39	0.18	0.982
	Zn^+2	6.01	6.62	0.049	0.969	5.87	0.05	0.984
Fe2O3-EC	Cu^+2	3.25	1.41	0.091	0.598	3.24	0.05	0.998
	Zn^+2	7.91	7.43	0.35	0.971	8.09	0.01	0.993