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

Table 2

Kinetic constants of Ce (III) ions adsorption at various concentrations of Ce (III) ion and temperature (dose- 0.5 mg g⁻¹).

Kinetic model	Parameters	303 K		313 K		323 K
		10 (mg L^−1)	30 (mg L^−1)	10 (mg L^−1)	30 (mg L^−1)	10 (mg L^−1)	30 (mg L^−1)
Experimental	qe (mg g^−1)	53.5	126.3	52.9	125.8	51.7	123.9
Pseudo-first-order	k1 (min^−1)	0.023	0.096	0.033	0.109	0.037	0.122
	qe (mg g^−1)	12.4	21.1	11.7	20.7	10.5	19.7
	R^2	0.890	0.863	0.904	0.853	0.909	0.899
Pseudo-second-order	k2 (g mg^−1min^−1)	0.009	0.007	0.010	0.008	0.012	0.010
	qe (mg g^−1)	54.1	126.8	53.8	126.2	53.2	125.7
	R^2	0.999	0.999	0.999	0.999	0.999	0.999
Elovich	α (mg g^−1 min^−1)	2.1 × 10^−25	2.0 × 10^−26	2.3 × 10^−26	2.1 × 10^−27	2.4 × 10^−27	2.3 × 10^−27
	β (mg g^−1)	1.16	1.87	1.24	1.85	1.33	1.88
	R^2	0.765	0.754	0.806	0.813	0.854	0.833