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UiO-66 membranes with confined naphthalene disulfonic acid for selective monovalent ion separation.
- Source :
-
Journal of Membrane Science . Jun2024, Vol. 703, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- The selective separation of monovalent ions remains a challenge because of the similar sub-nanometer sizes. Metal-organic frameworks (MOFs) are promising candidate membranes for ion selective separation based on the angstrom sized windows for size sieving. Here, to further enhance the monovalent ion selectivity, 1, 5-naphthalenedisulfonic acid tetrahydrate (NTDS) molecules with sulfonate groups are incorporated to offer a binding affinity, generating a UiO-66@NTDS membrane via the window-cavity structure confinement. In addition to the size sieving effect, the charge and affinity interaction can compensate the energy loss induced by the ion dehydration. Thus, the UiO-66@NTDS membranes exhibit elevated separation performance compared to the original UiO-66 membranes under the concentration gradient driven, accompanied by high monovalent cation permeation rates (i.e., 0.3–0.7 mol m−2 h−1) and mono-/divalent cation selectivities (i.e., ∼73 for K+/Mg2+, ∼57 for Na+/Mg2+, and ∼46 for Li+/Mg2+). This work provides guidelines for the development of efficient ion-selective MOF membranes via the combination of size sieving and interaction attraction. [Display omitted] • UiO-66@NTDS membranes are fabricated via an in-situ growth and confinement method. • The size sieving and interaction effects contribute to selective ion transport. • UiO-66@NTDS membranes exhibit efficient mono-/divalent ion separation performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03767388
- Volume :
- 703
- Database :
- Academic Search Index
- Journal :
- Journal of Membrane Science
- Publication Type :
- Academic Journal
- Accession number :
- 177420223
- Full Text :
- https://doi.org/10.1016/j.memsci.2024.122829