Affiliation:
1. State Key Laboratory of Separation Membranes and Membrane Processes and School of Textile Science and Engineering Tiangong University Tianjin 300387 China
2. State Key Laboratory of Separation Membranes and Membrane Processes and School of Chemistry and Chemical Engineering Tiangong University Tianjin 300387 China
3. State Key Laboratory of Engines School of Mechanical Engineering Tianjin University Tianjin 300072 China
4. National Industry‐Education Platform of Energy Storage Tianjin University Tianjin 300072 China
Abstract
AbstractUltrathin membranes with ultrahigh permeance and good gas selectivity have the potential to greatly decrease separation process costs, but it requires the practical preparation of large area membranes for implementation. Metal–organic frameworks (MOFs) are very attractive for membrane gas separation applications. However, to date, the largest MOF membrane area reported in the literature is only about 100 cm2. In the present study, a new step‐nucleation in situ self‐repair strategy is proposed that enables the preparation of large‐area (2400 cm2) ultrathin and rollable MOF membranes deposited on an inexpensive flexible polymer membrane support layer for the first time, combining a polyvinyl alcohol (PVA)‒metal‐ion layer and a pure metal‐ion layer. The main role of the pure metal‐ion layer is to act as the main nucleation sites for MOF membrane growth, while the PVA‒metal‐ion layer acts as a slow‐release metal‐ion source, which supplements MOF crystal nucleation to repair any defects occurring. Membrane modules are necessary components for membrane applications, and spiral‐wound modules are among the most common module formats that are widely applied in gas separation. A 4800 cm2 spiral‐wound membrane module was successfully prepared, demonstrating the practical implementation of large‐area MOF membranes.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
4 articles.
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