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

Table 5

Thermodynamic variables calculated for the recovery of Ce (III) and Pr (III) ions by IL (time- 30 min, dose- 0.5 mg g⁻¹).

Metal ion	Temperature (K)	Sorption capacity (qe mg g^−1)	∆G^° (kJ mol^−1)	∆H^° (kJ mol^−1)	∆S^° (J mol^−1 k^−1)
Ce (III)	303	53.5	−4.56	−5.22	692.3
	313	52.9	−4.21
	323	51.7	−3.90
Pr (III)	303	47.1	−4.12	−4.76	789.1
	313	46.7	−3.97
	323	46.1	−3.66