The development of highly effective and durable CO₂ separation membrane is still a challenge for the carbon capture and storage. Herein, a novel BN nanosheets supported magnetic ionic liquid membrane (BN-SMILM) is constructed by nanoconfining magnetic ionic liquid (MIL) [P_6,6,6,14][FeCl₄] to the two-dimentional (2D) nanochannels of laminated BN membrane. The 2D nanochannels provide a well support and restricted space for the MIL. The nanoconfinement effect makes the magnetic [FeCl₄]^- anions align along the center of 2D BN nanochannels, leading to selectively accelerate the CO₂ transport. The nanoconfinement effect and CO₂ separation mechanism are further explicated by the molecular dynamic simulations. As a result, compared with the polymer supported MIL membrane, the as-prepared BN-SMILM exhibits better CO₂ separation performance, with CO₂ permeability of about 227 Barrer and CO₂/N₂ selectivity of 90 that is above the 2008 Robeson upper-bound. The BN-SMILM also presents excellent long-term stability after 7 days operation, revealing the promising applications in CO₂ separation. This work provides a new strategy to prepare high-performance supported liquid membrane materials towards practical environmental and energy application.

高效耐用的CO ₂分离膜的开发仍然是碳捕获和储存的挑战。本文中，通过将磁性离子液体（MIL）[P _6,6,6,14 ] [FeCl ₄ ]纳米限制到二维（2D）纳米通道，构造了一种新型的BN纳米片支撑的磁性离子液体膜（BN-SMILM）。层压BN膜。2D纳米通道为MIL提供了良好的支撑和有限的空间。纳米约束效应使磁性[FeCl ₄ ] ^-阴离子沿二维BN纳米通道的中心排列，从而选择性地加速了CO _2的传输。纳米约束效应和CO ₂分子动力学模拟进一步阐明了分离机理。结果，与聚合物支撑的MIL膜相比，所制备的BN-SMILM表现出更好的CO ₂分离性能，其CO ₂渗透率约为227 Barrer，CO ₂ / N ₂选择性为90，高于2008 Robeson上限-边界。BN-SMILM在运行7天后也表现出出色的长期稳定性，显示出在CO ₂分离中很有希望的应用。这项工作提供了一种新的策略，可以制备高性能的支撑液膜材料，以应用于实际的环境和能源应用。