Ultrathin water-stable metal-organic framework membranes for ion separation

Meipeng Jian, Ruosang Qiu, Yun Xia, Jun Lu, Yu Chen, Qinfen Gu, Ruiping Liu, Chengzhi Hu, Jiuhui Qu, Jiuhui Qu, Huanting Wang, Xiwang Zhang

Research output: Contribution to journalArticleResearchpeer-review

38 Citations (Scopus)

Abstract

Owing to the rich porosity and uniform pore size, metal-organic frameworks (MOFs) offer substantial advantages over other materials for the precise and fast membrane separation. However, achieving ultrathin water-stable MOF membranes remains a great challenge. Here, we first report the successful exfoliation of two-dimensional (2D) monolayer aluminum tetra-(4-carboxyphenyl) porphyrin framework (termed Al-MOF) nanosheets. Ultrathin water-stable Al-MOF membranes are assembled by using the exfoliated nanosheets as building blocks. While achieving a water flux of up to 2.2 mol m-2 hour-1 bar-1, the obtained 2D Al-MOF laminar membranes exhibit rejection rates of nearly 100% on investigated inorganic ions. The simulation results confirm that intrinsic nanopores of the Al-MOF nanosheets domain the ion/water separation, and the vertically aligned aperture channels are the main transport pathways for water molecules.

Original languageEnglish
Article numberEAAY3998
Number of pages10
JournalScience Advances
Volume6
Issue number23
DOIs
Publication statusPublished - 5 Jun 2020

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