Eliminating lattice defects in UiO-66-NH2 membrane towards high-precision desalination

Advanced Membranes Pub Date : 2025-01-01 DOI:10.1016/j.advmem.2025.100142

Wenwen Dong , Jiahui Yan , Taotao Ji , Mingming Wu , Kunpeng Yu , Yi Liu , Wenjing Hu , Yi Liu

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Abstract

Zirconium-based MOF membranes exhibit significant potential in energy-efficient desalination. Nevertheless, framework defect elimination, which represents an effective protocol to enhance their molecular sieving capacity and operation stability, remains highly challenging to date. In this study, we proposed a framework defect patching strategy to prepare robust UiO-66-NH₂ membrane with Zr₆O₄(OH)₄(OAc)₁₂ cluster source towards high-efficiency desalination. Ion sieving results indicated that increasing reaction temperature and ratio of ligand to Zr₆O₄(OH)₄(OAc)₁₂ cluster contributed to framework defect elimination. UiO-66-NH₂ membranes prepared under optimized conditions exhibited superior metal ion rejection rate (Al³⁺: 97.7 %) and operation stability over 20 days. Particularly, their water/NaCl separation performance well exceeded majority of reported polycrystalline 3D membranes, offering promising prospects for modulating molecular diffusion kinetics in MOF pores.

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消除UiO-66-NH2膜的晶格缺陷，实现高精度脱盐

锆基MOF膜在节能脱盐方面具有巨大的潜力。然而，框架缺陷消除作为提高其分子筛分能力和运行稳定性的有效方案，迄今仍具有很大的挑战性。在本研究中，我们提出了一种框架缺陷修补策略，以Zr6O4(OH)4(OAc)12簇源制备健壮的UiO-66-NH2膜，以实现高效脱盐。离子筛分结果表明，提高反应温度和配体与Zr6O4(OH)4(OAc)12簇的比例有助于消除骨架缺陷。在优化条件下制备的UiO-66-NH2膜具有优异的金属离子截留率（Al3+: 97.7%）和20 d运行稳定性。特别是，它们的水/NaCl分离性能远远超过大多数已报道的多晶3D膜，为调节MOF孔中的分子扩散动力学提供了广阔的前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Membranes

CiteScore

8.50

自引率

0.00%

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