Green Synthesis of Hydroxyapatite Nanoparticles Using Monoon longifolium Leaf Extract for Removal of Fluoride from Aqueous Solution

Table 5

Thermodynamic parameters for fluoride ion adsorption on HAp NPs adsorbent.

Adsorbent	Temp (K)	KL	ΔG° (KJ·mol^−1)	ΔH° (KJmol^−1)	ΔS° (JK^−1·mol^−1)	R^2
HAp NPs	298	−1.86	2.89	40.78	127.54	0.94
	303	−1.61	2.30
	308	−1.33	1.61
	313	−0.86	0.44
	318	−0.57	−0.32
	323	−0.52	−0.48
	328	−0.51	−0.50