Table 2. The ion exchange sorption constants obtained by fitting the isotherm data with different models.

	Cs+ ion exchange		Sr2+ ion exchange		UO22+ ion exchange
	Langmuir	Langmuir–Freundlich	Langmuir	Langmuir–Freundlich	Langmuir	Langmuir–Freundlich
q e (mg g–1)	280(11)	304(22)	102 (5)	113(14)	287(15)	358(61)
b (L mg–1)	0.09(2)	0.07(2)	0.20(8)	0.19(15)	0.23(6)	0.09(6)
n	—	1.37(23)	—	1.81(54)	—	1.52(24)
R 2	0.965	0.972	0.923	0.928	0.952	0.960