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Covalent organic framework membranes for efficient separation of monovalent cations
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Journal Article
Covalent organic framework membranes for efficient separation of monovalent cations
2022
Overview
Covalent organic frameworks (COF), with rigid, highly ordered and tunable structures, can actively manipulate the synergy of entropic selectivity and enthalpic selectivity, holding great potential as next-generation membrane materials for ion separations. Here, we demonstrated the efficient separation of monovalent cations by COF membrane. The channels of COF membrane are decorated with three different kinds of acid groups. A concept of confined cascade separation was proposed to elucidate the separation process. The channels of COF membrane comprised two kinds of domains, acid-domains and acid-free-domains. The acid-domains serve as confined stages, rendering high selectivity, while the acid-free-domains preserve the pristine channel size, rendering high permeation flux. A set of descriptors of stage properties were designed to elucidate their effect on selective ion transport behavior. The resulting COF membrane acquired high ion separation performances, with an actual selectivity of 4.2–4.7 for K
+
/Li
+
binary mixtures and an ideal selectivity of ~13.7 for K
+
/Li
+
.
Membrane technology holds great promise in separating monovalent cations but the sub-nanometer ion size and the small difference in ion size makes separation of monovalent cations a challenging task. Here, the authors demonstrate the efficient separation of monovalent cations using a COF membrane.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
