Liu Wei, Li Yuan, Xu Linlin, Wang Gang, Ma Xiaofei, Wang Yong
Department of Chemistry, School of Science, Tianjin University, Tianjin, 300072, China.
Department of Chemical Engineering, University College London, London, WC1E 7JE, UK.
Small. 2022 May;18(18):e2200461. doi: 10.1002/smll.202200461. Epub 2022 Apr 5.
Two-dimensional (2D) lamellar membranes have attracted increasing attention for efficient water purification. However, the low water-permeability, structural failure in aqua and high production cost have significantly restricted their practical large-scale applications. Inspired by the structures of glomerular filtration barrier (GFB) and nacre, a high-performance biomimic membrane via supramolecular-mediated intercalation assembly is reported, where rod-shaped cyclodextrin (CD) functionalized attapulgite (ATP-CD) is intercalated into CD-modified graphene oxide (GO-CD) lamellar channels, followed by locking adjacent ATP-CD and GO-CD through tannic acid (TA) and CD supramolecular networks. The formed GFB-like heterostructure endows the membrane with excellent water transport capability and the bionic "brick and mortar" nacre configuration boosts its anti-swelling stability simultaneously. The heterostructured GO membranes (≈100 nm) fabricated in this way exhibit a good water permeability of 55.6 L m h bar (≈20-fold higher than GO membrane) maintaining excellent dye rejection of >99% during 480 h immersion. Given the low-cost materials (ATP, CD, and TA) and the modification generality, this economic strategy can hopefully achieve large-scale membrane fabrication and afford high applicability, which promotes the practical engineering applications of such 2D material membranes.
二维（2D）层状膜因其高效的水净化性能而受到越来越多的关注。然而，其低透水性、在水中的结构破坏以及高生产成本严重限制了它们在实际中的大规模应用。受肾小球滤过屏障（GFB）和珍珠母结构的启发，报道了一种通过超分子介导的插层组装制备的高性能仿生膜，其中棒状环糊精（CD）功能化凹凸棒石（ATP-CD）被插入到CD修饰的氧化石墨烯（GO-CD）层状通道中，然后通过单宁酸（TA）和CD超分子网络锁定相邻的ATP-CD和GO-CD。形成的类GFB异质结构赋予膜优异的水传输能力，仿生的“砖和砂浆”珍珠母结构同时增强了其抗溶胀稳定性。以这种方式制备的异质结构GO膜（≈100 nm）表现出良好的水渗透性，为55.6 L m⁻² h⁻¹ bar⁻¹（≈比GO膜高20倍），在480 h浸泡过程中保持>99%的优异染料截留率。鉴于材料成本低（ATP、CD和TA）以及改性通用性，这种经济策略有望实现大规模膜制备并具有高适用性，从而推动此类二维材料膜的实际工程应用。
