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Fabrication of hydrophobic ZIFs based composite membrane with high CO 2 absorption performance
Korean Journal of Chemical Engineering ( IF 2.9 ) Pub Date : 2021-04-23 , DOI: 10.1007/s11814-021-0762-z
Li Xu , Yu Qin , Liying Liu , Juntian Xiao , Zhongwei Ding

The membrane contactor has been considered an effective device to capture CO2, but its performance is limited by membrane wetting phenomena. In this work, the ZIF-8/ZIF-L (zeolitic imidazolate framework) based composite membrane with excellent hydrophobic stability and CO2 permeability was successfully fabricated by coating the dense layer on the porous PVDF (polyvinylidene fluoride) substrate. The dense layer was developed by evenly incorporating ZIF-8 nanocrystals and ZIF-L nanosheets into the polydimethylsiloxane (PDMS) polymer. The as-prepared membrane possessed competitive hydrophobicity with a water contact angle (WCA) of 131.8°. And after a ten-day immersion test in CO2 absorbent, the WCA only declined by 9.8%, exhibiting excellent hydrophobic stability. Besides, the CO2 permeability of the composite membrane was 61.8×10−8·mol·m−2·s−1·Pa−1 with an ideal CO2/N2 separation factor of ∼20, which was effectively improved in comparison with the control membrane. In the CO2 absorption experiment, the prepared membrane achieved the competitive CO2 flux of 3.02×10−3·mol·m−2·s−1 when the liquid velocity was 0.25 m·s−1 and displayed robust long-term operating stability. Finally, the AC impedance technique was applied to continuously monitor the wetting state of composite membranes, which further investigated their anti-wetting ability.



中文翻译:

具有高CO 2吸收性能的疏水性ZIFs基复合膜的制备

膜接触器已经被认为是捕获CO 2的有效装置,但是其性能受到膜润湿现象的限制。在这项工作中,通过将致密层涂覆在多孔PVDF(聚偏二氟乙烯)基底上,成功制备了具有优异的疏水稳定性和CO 2渗透性的ZIF-8 / ZIF-L(沸石咪唑酸酯骨架)基复合膜。通过将ZIF-8纳米晶体和ZIF-L纳米片均匀掺入聚二甲基硅氧烷(PDMS)聚合物中来形成致密层。所制备的膜具有竞争性疏水性,水接触角(WCA)为131.8°。在CO 2中浸泡十天后吸收剂方面,WCA仅下降了9.8%,表现出出色的疏水稳定性。此外,复合膜的CO 2渗透率为61.8×10 -8 ·mol·m -2 ·s -1 ·Pa -1,理想的CO 2 / N 2分离系数为〜20,与之相比有效提高。与对照膜。在CO 2吸收实验中,当液速为0.25 m·s -1时,制备的膜达到3.02×10 -3 ·mol·m -2 ·s -1的竞争性CO 2通量。并显示出强大的长期运行稳定性。最后,采用交流阻抗技术连续监测复合膜的润湿状态,进一步研究了复合膜的抗润湿能力。

更新日期:2021-04-24
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