Preparation of mixed matrix composite membrane for hydrogen purification by incorporating ZIF-8 nanoparticles modified with tannic acid |
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| Affiliation: | 1. Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, PR China;2. Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300350, PR China;1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;2. Institute of Seawater Desalination and Multipurpose Utilization, (SOA) Tianjin, Tianjin 300192, China;3. School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287, United States;1. State Key Laboratory of Separation Membranes and Membrane Processes / National Center for International Joint Research on Separation Membranes, Tiangong University, Tianjin, 300387, China;2. School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China |
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| Abstract: | The incompatibility between nanofillers and polymer, caused by the agglomeration of nanoparticles and their weak interaction with each other, is still a challenge to develop mixed matrix composite membrane. Herein, we introduced the ZIF-8-TA nanoparticles synthesized by in situ hydrophilic modification into the hydrophilic poly(vinylamine) (PVAm) matrix to prepare composite membranes for H2 purification. The dispersion of ZIF-8 in water was improved by tannic acid modification, and the compatibility between ZIF-8 particles and PVAm matrix was enhanced by chemical crosslinking between the quinone groups in oxidized tannic acid (TA) and the amino groups in PVAm. Moreover, the compatibility between hydrophobic polydimethylsiloxane (PDMS) gutter layer and hydrophilic separation layer was achieved by the adhesion of TA-Fe3+ complex to the surface of PDMS layer during membrane preparation. The interlayer hydrophilic modification and the formation of separation layer were accomplished in one step, which simplified the preparation process. The experimental results indicated that when the TA addition used for modification was 0.5 g and the ZIF-8-TA0.5 content in membrane was 12 wt%, the prepared membrane showed the best separation performance with the CO2 permeance of 987 GPU and the CO2/H2 selectivity of 31, under the feed gas pressure of 0.12 MPa. |
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| Keywords: | ZIF-8-TA Hydrophilic modification Mixed matrix composite membrane Hydrogen purification Compatibility |
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