Langmuir, Freundlich, Temkin and Dubinin Radushkevich isotherm constants for fluoride adsorption by neat HAP and HAP-MMT.

		HAP-MMT	HAP
Experimental data	q e (mg g−1)	14.90	7.32
Langmuir isotherm constants	Q L (mg g−1)	23.70	6.71
	K L (min−1)	14.15	3.43
	R 2	0.576	1.00
Freundlich isotherm constants	n	1.230	1.98
	Q e (mg g−1)	16.71	6.98
	K f (g mg−1 min−1)	1.41	1.60
	R 2	0.986	0.805
Temkin isotherm constants	K t (L g−1)	0.910	1.327
	B t × 103	11.062	4.157
	R 2	0.902	0.904
Dubinin Rarushkevish isotherm constant	K DR (mol2 J−2)	1 × 10−7	8 × 10−8
	Q m (mg g−1)	2.829	6.810
	E (kJ mol−1)	1.414	0.000
	R 2	0.061	0.961