Characterization and Utilization of Tannin Extract for the Selective Adsorption of Ni (II) Ions from Water

Table 3

Adsorption isotherm parameters for the adsorption of Ni (II) ions.

Isotherms models	Variables	TGAN-Ni
Langmuir		0.037
		0.994
		250
Freundlich	(mg g^−1)	2.511
		0.985
		0.434
Temkin		2.814
		0.977
		762.3
Dubinin-Radushkevich		0.948
	(mg g^−1)	0.456
	(kJ moL^−1)	0.088
	(10^−5 mol^2 kJ^−2)	64.88