High-throughput CO2 capture using PIM-1@MOF based thin film composite membranes
High-throughput CO2 capture using PIM-1@MOF based thin film composite membranes
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DOI：
10.1016/j.cej.2020.125328
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发表时间：
2020-09-15
影响因子：
15.1
通讯作者：
Qiao, Greg G.
中科院分区：
文献类型：
--
作者：
Liu, Min;Nothling, Mitchell D.;Qiao, Greg G.
发电厂的碳捕集是一种缓解温室气体排放增加的有力技术。在这项工作中，我们描述了一种薄膜复合材料（TFC）膜，将聚合物的固有微孔（PIM-1）和金属有机框架（MOF）的纳米粒子燃烧后的二氧化碳捕获。新型TFC膜设计由三层组成：（1）由PIM-1@MOF混合基质组成的CO2选择性层;（2）掺杂有MOF纳米片的超渗透PDMS槽层;和（3）多孔聚合物基底。值得注意的是，结合无定形纳米片的PDMS@MOF槽层提供10，000 - 11，000 GPU的CO2渗透率，表明与原始PDMS槽层相比气体传输阻力较小。此外，通过将纳米尺寸的MOF颗粒（MOF-74-Ni和NH 2-U10 -66）共混到PIM-1中以提供选择性层，与原始PIM-1对应物（4320 GPU的CO2渗透性和19的CO2/N-2选择性）相比，所得TFC膜组件提供4660-7460 GPU的改进的CO2渗透性和26-33的CO2/N-2选择性。此外，基于PIM-1@MOF的TFC膜显示出增强的抗老化效果，在老化8周后保持稳定的900-1200 GPU的CO2渗透性和26-30的CO2/N-2选择性。据我们所知，这里呈现的高CO2分离性能对于公开文献中报道的基于PIM-1的TFC膜是前所未有的。
Carbon capture from power plants represents a powerful technique to mitigate increasing greenhouse gas emissions. In this work, we describe a thin film composite (TFC) membrane incorporating a polymer of intrinsic microporosity (PIM-1) and metal organic framework (MOF) nanoparticles for post-combustion CO2 capture. The novel TFC membrane design consists of three layers: (1) a CO2 selective layer composed of a PIM-1@MOF mixed matrix; (2) an ultrapermeable PDMS gutter layer doped with MOF nanosheets; and (3) a porous polymeric substrate. Notably, the PDMS@MOF gutter layer incorporating amorphous nanosheets provides a CO2 permeance of 10,000-11,000 GPU, suggesting less gas transport resistance in comparison with pristine PDMS gutter layers. In addition, by blending nanosized MOF particles (MOF-74-Ni and NH2-UiO-66) into PIM-1 to afford a selective layer, the resultant TFC membrane assembly delivered improved CO2 permeance of 4660-7460 GPU and CO2/N-2 selectivity of 26-33, compared with a pristine PIM-1 counterpart (CO2 permeance of 4320 GPU and CO2/N-2 selectivity of 19). Furthermore, PIM-1@MOF based TFC membranes displayed an enhanced resistance to aging effect, maintaining a stable CO2 permeance of 900-1200 GPU and CO2/N-2 selectivity of 26-30 after aging for 8 weeks. To the best of our knowledge, the high CO2 separation performance presented here is unprecedented for PIM-1 based TFC membranes reported in the open literature.