Adsorption of Rare Earth Ce³⁺ and Pr³⁺ Ions by Hydrophobic Ionic Liquid

Table 1

Constants of Freundlich and Langmuir isotherm derived for the recovery of Ce (III) and Pr (III) ions from liquid phases by IL (temperature −303 K and dose 0.5 mg g⁻¹).

Isotherm	Parameters	Ce (III)	Pr (III)
Freundlich	Kf (mg g^−1)	6.23	8.91
	1/n (L mg^−1)	0.021	0.017
	R^2	0.975	0.979
Langmuir	Vm (mg g^−1)	169.2	144.4
	b (L mg^−1)	0.023	0.031
	R^2	0.990	0.981