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Abstract Dimensionally adjustable channels are incorporated into a crystalline lattice via strategic stacking of wrinkled layers, boosting rare earth element (REE) ion exchange performance due to the eliminated energy‐intensive dehydration and channel rigidity. In (CH 3) 2 NH 2 2 Ga 2 Sb 2 S 7 (GaSbS‐1), the lone electron pair (LEP) on Sb 3+ in the trigonal pyramidal SbS 3 influences Ga─S bond orientations, creating wrinkled Ga 2 Sb 2 S 7 n 2 n − layers. Staggered stacking forms parallel channels occupied by (CH 3) 2 NH 2 + cations, facilitating outstanding exchange for REE 3+ ions (Y 3+, La 3+ −Lu 3+). Dynamic interlamellar expansion endows GaSbS‐1 with remarkable kinetics (R = 97. 14%–99. 40% within 5 min; k 2 = 2. 592–3. 462 g mg −1 min −1) and capacities (63, 125, 143, and 138 mg g −1) for Y 3+, Ce 3+, Eu 3+, and Tm 3+. It exhibits structural stability across pH = 2–12, with K d values > 10 4 –10 5 mL g −1 at pH = 4–9, and superior selectivity for REE 3+ over competing ions. Performance remains robust in real aqueous environments, including sea water, with maximum REE 3+ removal rates >90%. Rapid kinetics enable efficient column filtration (R = 93. 10%–98. 51%) and recycling capability. The GaSbS‐1 /PTFE membrane achieves 99. 71%–99. 95% removal of trace REE 3+ at 1. 38 mL min ‒1 cm ‒2 (0. 17 s contact time). With high yield, irradiation resistance, and facile elution, GaSbS‐1 is a proof‐of‐concept exchanger for purifying REE‐contaminated radioactive wastewater.
Wang et al. (Thu,) studied this question.