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

Table 2

Maximum lanthanum and europium adsorption capacities (𝑞_max) on hydroxyapatite and other adsorbents.

Adsorbents	REE ion	𝑞max (mg/g)	𝑞max (mmol/g)	References
Hydroxyapatite	La(III)	0.25 ± 0.01	0.006	Present work
	Eu(III)	0.94 ± 0.01	0.002	Present work
Sargassum biomass	La(III)		0.8-0.9	[23]
BaCO3	Eu(III)	16	0.1	[26]
TiO2	La(III)	0.49 ± 0.01		[28]
ZSM-5 zeolite	Eu(III)		2.2 × 10^−5	[30]
TiO2	Eu(III)		0.01	[33]
Inmobilized pseudomonas aeruginosa	La(III)		0.342	[32]
TiAlPH	Eu(III)	20−30		[35]