Table 2 Comparison of some chemically modified resins for REEs

Resin	REE adsorbed	Adsorption capacity	Adsorption pH	Reference
BZmacropa-XAD resin	La³⁺ Dy³⁺ Lu³⁺	16.8 mg g⁻¹ 10.9 mg g⁻¹ 7.2 mg g⁻¹	5 (100 mM NH₄OAc)	This study
Cryptand-modified resin	Eu²⁺ Gd³⁺	22.8 mg g⁻¹ 7.65 mg g⁻¹	5.5	⁴¹
XAD-4-[monoaza dibenzo18-crown-6]	La³⁺ Nd³⁺ Sm³⁺	9.2 mg g⁻¹ 8.9 mg g⁻¹ 8.3 mg g⁻¹	4.5	⁴²
bis-2[(o-carbomethoxy)phenoxy]ethylamine XAD-4 resin	Mixture of La³⁺, Nd³⁺ Sm³⁺	1.84 mmol g⁻¹ in total	5.0	⁸⁶
BPG functionalized resin	Nd³⁺ Gd³⁺ Ho³⁺	3.0 mg g⁻¹ in total	5.4 (0.5 M NaCl)	⁸⁷
SP resin	La³⁺	52 mg mL⁻¹	1.5	⁸⁸
SA resin	La³⁺	64 mg mL⁻¹	1.5	⁸⁸
Tulsion CH-93	Gd³⁺	10.6 mg g⁻¹	0.1 M H₃PO₄	⁸⁹
Amberlite IRC86	La³⁺ Sm³⁺ Er³⁺ Y³⁺	40 mg mL^−1a 51 mg mL^−1a 82 mg mL^−1a 54 mg mL^−1a	4.38	⁹⁰
netPoly(DETA)-ν-ECH-MP	Mixture of Pr³⁺, Nd³⁺ Gd³⁺, Ho³⁺ Er³⁺, Lu³⁺	76 mg g⁻¹ in total	6	⁷²
(DEHDGA) grafted polymer resin	Y³⁺ Lu³⁺	14.1 mg g⁻¹ 28.9 mg g⁻¹	5.6	⁹¹

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