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

Lu, YahuaStockholms universitet,Institutionen för material- och miljökemi (MMK),Beijing University of Technology, People’s Republic of China (författare)

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

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

Zhou, Rongkun (författare)
Wang, Naixin (författare)
Yang, Yuye (författare)
Zheng, Zilong (författare)
Zhang, Miao,1990-Stockholms universitet,Institutionen för material- och miljökemi (MMK)(Swepub:su)mizh4435 (författare)
An, Quan-Fu (författare)
Yuan, Jiayin,1979-Stockholms universitet,Institutionen för material- och miljökemi (MMK)(Swepub:su)jiyu0266 (författare)
Stockholms universitetInstitutionen för material- och miljökemi (MMK) (creator_code:org_t)

Av författaren/redakt...: Lu, Yahua; Zhou, Rongkun; Wang, Naixin; Yang, Yuye; Zheng, Zilong; Zhang, Miao, 199 ...; visa fler...; An, Quan-Fu; Yuan, Jiayin, 19 ...; visa färre...

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