Adsorption Behaviour of La(III) and Eu(III) Ions from Aqueous Solutions by Hydroxyapatite: Kinetic, Isotherm, and Thermodynamic Studies

Table 3

Parameters of the Freundlich model (log𝑞_𝑒=1/𝑛log𝐶_𝑒+log𝐾_𝐹) applied to experimental data for La(III) and Eu(III) adsorption on hydroxyapatite at room temperature and pH_eq = 5.75 ± 0.03.

Parameters	[La(III)]I = 3.3 × 10^−5–2.2 × 10^−4 M	[La(III)]I = 1.7–3.6 × 10^−4 M	[Eu(III)]I = 1.9–4 × 10^−4 M
1/n	4.7	2.30	1.85
𝐾𝐹 (L/mg)	0.12	1.17	1.59
𝑅^2	0.96	0.99	0.99