Graphene Oxide Nanoadsorbent for the Removal of Fluoride Ion from Groundwater: Adsorbent Performance and Adsorption Mechanism

Table 4

The four isotherm models’ parameter values for fluoride adsorption by GO.

Isotherms model	Parameters	Values
Langmuir	R^2	0.96
	qm (mg g^−1)	6
	KL (L mg^−1)	0.098
	∆G (KJ mol^−1)	−10.6
	RL	0.5
Freundlich	R^2	0.99
	KF (mg g^−1)	4.61
	n	4.05
Tempkin	R^2	0.94
	KT (L g^−1)	0.86
	b (J mol^−1)	1760.4
D–R	R^2	0.92
	qm (mg g^−1)	5
	KD-R (L mg^−1)	−0.001
	E (KJ mol^−1)	17