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Engineering HOF-Based Mixed-Matrix Membranes for Efficient CO2 Separation
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DOI：10.1007/s40820-023-01020-w.png)
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Abstract
En 中文
Hydrogen-bonded organic frameworks (HOFs) have emerged as a new class of crystalline porous materials, and their application in membrane technology needs to be explored. Herein, for the first time, we demonstrated the utilization of HOF-based mixed-matrix membrane for CO2 separation. HOF-21, a unique metallo-hydrogen-bonded organic framework material, was designed and processed into nanofillers via amine modulator, uniformly dispersing with Pebax polymer. Featured with the mix-bonded framework, HOF-21 possessed moderate pore size of 0.35 nm and displayed excellent stability under humid feed gas. The chemical functions of multiple binding sites and continuous hydrogen-bonded network jointly facilitated the mass transport of CO2. The resulting HOF-21 mixed-matrix membrane exhibited a permeability above 750 Barrer, a selectivity of similar to 40 for CO2/CH4 and similar to 60 for CO2/N-2, surpassing the 2008 Robeson upper bound. This work enlarges the family of mixed-matrix membranes and lays the foundation for HOF membrane development.
Keywords:
Hydrogen-bonded organic framework
Tunable size
Mixed-matrix membrane
Mixed-bond
Carbon capture
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