期刊
JOURNAL OF MEMBRANE SCIENCE
卷 638, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2021.119676
关键词
MOF membrane; Bimetallic MOF membrane; Membrane pervaporation; MeOH; MTBE separation
资金
- National Natural Science Foundation of China [22078038, 21878032, 21476039]
- Open Sharing Fund for the Large-Scale Instruments and Equipments of Dalian University of Technology [DUTKFJJ2021082]
Fabricating a high-quality bimetallic Zn/Co-ZIF tubular membrane on a porous ceramic tube allows for efficient separation of methanol/methyltert-butylether mixture, demonstrating excellent separation performance and long-term stability.
Preparation of defect-free and stable metal-organic framework tubular membrane for liquid separation is still a great challenge. In this work, a high-quality bimetallic Zn/Co-ZIF tubular membrane was fabricated via a novel strategy on a porous ceramic tube for the highly efficient separation of methanol (MeOH)/methyltert-butylether (MTBE) mixture by pervaporation. The strategy includes first the introduction of a thinlayer of Zn/Co hydroxy double salts (HDSs) on the tube surface and then the facile conversion of the HDS layer to a dense and stable bimetallic Zn/Co-ZIF membrane. The achieved membrane can preferentially separate MeOH from the 15 wt% MeOH/MTBE mixture and display an ultrahigh separation performance with flux of 1.96 kg m- 2 h-1 and separation factor of 6985. It can also demonstrate an excellent long-term operating stability benefited from the HDS layer acting as an inorganic linker. Therefore, the bimetallic Zn/Co-ZIF membrane has great industrial application potential for the separation of MeOH/MTBE mixture.
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