Pushing Rubbery Polymer Membranes to be Economic for CO2 Separation: Embedment with Ti3C2Tx MXene Nanosheets.
Pushing Rubbery Polymer Membranes to be Economic for CO2 Separation: Embedment with Ti3C2Tx MXene Nanosheets.
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DOI：
10.1021/acsami.9b19960
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发表时间：
2019-12
影响因子：
9.5
通讯作者：
A. A. Shamsabadi-A.;Ali Pournaghshband Isfahani;Saeed Khoshhal Salestan;A. Rahimpour;Behnam Ghalei;E. Sivaniah-E.-Siva
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文献类型：
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作者：
A. A. Shamsabadi-A.;Ali Pournaghshband Isfahani;Saeed Khoshhal Salestan;A. Rahimpour;Behnam Ghalei;E. Sivaniah-E.-Siva
可持续和节能的分子分离需要具有高气体渗透性和选择性的膜。这项工作报告了通过将2D Ti 3C 2 Tx MXene纳米片嵌入Pebax®-1657中制造的自立式和薄膜混合基质膜（MMM）的优异CO2分离性能。自支撑膜的CO2/N2和CO2/H2分离性能高于Robeson的上界，并且薄膜复合（TFC）膜的性能处于成本有效的CO2捕获的目标区域。表征和分子动力学模拟结果表明，Pebax-Ti 3C 2 Tx膜的上级性能是由于Ti 3C 2 Tx和Pebax链之间形成氢键，导致在Pebax的硬段中形成良好的Ti 3C 2 Tx纳米片层。界面相互作用和选择性的Ti 3C 2 Tx纳米通道使快速和选择性的CO2运输成为可能。Pebax®-2533和聚氨酯在嵌入Ti 3C 2 Tx时的传输性能增强进一步支持了这些发现。新型TFC膜的易于制造和高分离性能表明其具有巨大的节能CO2分离潜力，成本低至29美元/吨分离CO2。
Sustainable and energy-efficient molecular separation require membranes with high gas permeability and selectivity. This work reports excellent CO2 separation performance of self-standing and thin-film mixed matrix membranes (MMMs) fabricated by embedding 2D Ti3C2Tx MXene nanosheets in Pebax®-1657. The CO2/N2 and CO2/H2 separation performances of the free-standing membranes are above Robeson's upper bounds, and the performances of the thin-film composite (TFC) membranes are in the target area for cost-efficient CO2 capture. Characterization and molecular dynamics simulation results suggest that the superior performances of the Pebax-Ti3C2Tx membranes are due to the formation of hydrogen bonds between Ti3C2Tx and Pebax chains, leading to the creation of the well-formed galleries of Ti3C2Tx nanosheets in the hard segments of the Pebax. The interfacial interactions and selective Ti3C2Tx nanochannels enable fast and selective CO2 transport. Enhancement of the transport properties of Pebax®-2533 and a polyurethane when embedded with Ti3C2Tx further supports these findings. The ease of fabrication and high separation performance of the new TFC membranes point to their great potential for energy-efficient CO2 separation with the low cost of $29/ton separated CO2.