Graphene oxide (GO) membranes have shown great prospects as the next-generation membranes to tackle many challenging separation issues. However, the employment of GO membranes remains difficult for the precise separation of molecules with strong coupling effect and small size discrepancy such as water–ethanol. Herein, a new strategy of constructing exclusive and fast water channels in GO membrane was proposed to achieve high-performance water–ethanol separation via the synergy between zwitterion-functionalized GO and hydrophilic polyelectrolyte. The as-formed ordered and stable channels possess high-density ionic hydrophilic groups, which benefit from inhibiting the strong coupling between water and ethanol, facilitating the fast permeation of water molecules while suppressing ethanol molecules. As a result, the ultrathin GO-based membrane acquires exceptionally high separation performance with a flux of 3.23 kg/m² h and water–ethanol separation factor of 2,248 when separating water–ethanol (10 wt%/90 wt%) mixture at 343 K. This work paves a feasible way to construct 2D channels for the high-efficiency separation of strong-coupling mixtures.

中文翻译：

---

用于高效水-乙醇分离的两性离子氧化石墨烯膜中独特且快速的水通道

氧化石墨烯 (GO) 膜作为下一代膜已显示出巨大的前景，可解决许多具有挑战性的分离问题。然而，GO膜的使用仍然难以精确分离具有强耦合效应和小尺寸差异的分子，例如水-乙醇。在此，提出了一种在 GO 膜中构建专属且快速的水通道的新策略，以通过两性离子功能化的 GO 与亲水性聚电解质之间的协同作用实现高效的水-乙醇分离。形成的有序且稳定的通道具有高密度的离子亲水基团，其受益于抑制水和乙醇之间的强耦合，促进水分子的快速渗透，同时抑制乙醇分子。因此， 在 343 K 下分离水-乙醇 (10 wt%/90 wt%) 混合物时需要²小时，水-乙醇分离因子为 2,248。这项工作为构建二维通道以高效分离强耦合混合物铺平了道路.