Engineer Nanoscale Defects into Selective Channels: MOF-Enhanced Li+ Separation by Porous Layered Double Hydroxide Membrane

• DOI: 10.1007/s40820-023-01101-w
• Publication Date: 2023-06-07T17:01:46Z
• Authors: Yahua Lu; Rongkun Zhou; Naixin Wang; Yuye Yang; Zilong Zheng; Miao Zhang; Quan-Fu An; Jiayin Yuan
• Keywords: Zeolitic imidazolate framework

Two-dimensional (2D) membrane-based ion separation technology has been increasingly explored to address the problem of lithium resource shortage, yet it remains a sound challenge design 2D membranes high selectivity and permeability for applications. Zeolitic imidazolate framework functionalized modified layered double hydroxide (ZIF-8@MLDH) composite with lithium-ion (Li+) excellent operational stability were obtained in this work by situ depositing functional ZIF-8 nanoparticles into nanopores acting as defects MLDH membranes. The defect-rich amplified Li+, site-selective growth bettered its selectivity. Specifically speaking, ZIF-8@MLDH featured permeation rate Li+ up 1.73 mol m-2 h-1 desirable Li+/Mg2+ 31.9. Simulations supported that simultaneously enhanced are attributed changes type mass transfer channels difference dehydration capacity hydrated metal cations when they pass through nanochannels ZIF-8. This study will inspire ongoing research high-performance engineering defects.