Eco-Friendly Adsorbent from Waste of Mint: Application for the Removal of Hexavalent Chromium

Table 3

Adsorption isotherms models parameter at pH 2 for Cr(VI) adsorption by WM.

Model	Model parameters	Values of parameters
Freundlich	Linear expression	y = 0.824+0.856
	R^2	0.97
	KF (L/g)	2.354
	nF	0.824
Langmuir	Linear expression	y = 0.593x+0.005
	R^2	0.98
	KL (L/g)	0.009
	qm.L (mg/g)	172.410
	RL	0.999
D-R	Linear expression	y = −175.960x + 3.915
	R^2	0.87
	E (J/mol)	186.770
	qm,DR (mg/g)	50.180
Temkin	Linear expression	y = 27.690x-53.113
	R^2	0.92
	KT (L/g)	0.146
	BT (J/mol)	27.690