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Ti-Exchanged UiO-66-NH2–Containing Polyamide Membranes with Remarkable Cation Permselectivity
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  • Tingting Xu,
  • Fangmeng Sheng,
  • Bin Wu,
  • Muhammad Aamir ShehzadOrcid,
  • Aqsa Yasmin,
  • Xiuxia Wang,
  • Yubin He,
  • Liang Ge,
  • Xusheng Zheng,
  • Tongwen Xu
Tingting Xu
University of Science and Technology of China
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Fangmeng Sheng
University of Science and Technology of China
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Bin Wu
Anhui University
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Muhammad Aamir Shehzad
Orcid
CAS Key Laboratory of Soft Matter Chemistry, Laboratory of Functional Membranes
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Aqsa Yasmin
University of Science and Technology of China
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Xiuxia Wang
University of Science and Technology of China
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Yubin He
University of Sci. and Tech. of China
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Liang Ge
University of Sci. and Tech. of China
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Xusheng Zheng
University of Science and Technology of China
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Tongwen Xu
University of Sci. and Tech. of China
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Abstract

Monovalent cation permselective membranes (MCPMs) are highly desirable for the extraction of Li+ and Na+ ions from earth-abundant sources, such as salt lakes and seawater. Metal–organic frameworks (MOFs) are promising functional nanomaterials with excellent potential for ion separation technologies owing to their regular structure and tunable pore sizes. However, the successful use of MOFs in ion separation membranes is still challenging owing to the numerous difficulties in preparing ultrathin and defect-free MOF membranes. Here, we proposed a facile post-synthetic method for the preparation of UiO-66(Zr/Ti)-NH2 and subsequently immobilized UiO-66(Zr/Ti)-NH2 in an ultrathin polyamide layer (~100 nm). The resulting thin-film nanocomposite membranes presented high monovalent cation permeation and excellent selectivity for mono-/di-valent cations. The PNa+/Mg2+ and PLi+/Mg2+ permselectivities of the best-performing thin-film nanocomposite membrane were 13.44 and 11.38, respectively, which were 3.8 and 5.1 times higher, respectively, than those of the commercial state-of-art CSO membrane.