Monovalent selective ion-exchange membranes with characteristics of interception of multivalent ions and passage of monovalent ions, have aroused widespread research interest. However, most of monovalent selective ion-exchange membranes are dense polymer membranes, which suffer from low ion flux. Herein, a highly aligned two-dimensional (2D) thin anion lamellar composite membrane was developed successfully to address this weakness by assembling sulfonated Ti₃C₂T_x (STi₃C₂T_x) nanosheets on quaternized-chitosan (QCS) modified commercial Nylon-66 microfiltration membrane (N66). The QCS modified N66 that provides continuous sites and the STi₃C₂T_x lamellar ion channel that endows electrostatic repulsion and ion steric effect synergistically enhance the flux and selectivity of the composite membrane. Concretely, the resultant 2D thin anion lamellar composite membrane (N66-QCS/STi₃C₂T_x) achieves a high Cl⁻/SO₄²⁻ selectivity and Cl⁻ flux of 14.67 and 20.35 × 10⁻⁸ mol s⁻¹ cm⁻², which are 1.94 and 3.08 times higher than the commercial Neosepta ACS (7.56 and 6.60 × 10⁻⁸ mol cm⁻² s⁻¹). Furthermore, the negatively charged N66-QCS/STi₃C₂T_x shows favorable hydrophilicity and sufficient antifouling potential. The strategy of fabricating sulfonated Ti₃C₂T_x anion-exchange membrane provides fundamental information for the rational design of separation membranes that target to acquire high comprehensive performance.

具有多价离子截留和单价离子通过特性的单价选择性离子交换膜引起了广泛的研究兴趣。但是，大多数单价选择性离子交换膜是致密的聚合物膜，其离子通量低。本文中，成功开发了高度对齐的二维（2D）薄阴离子层状复合膜，通过在季铵化壳聚糖（QCS）改性的商用产品上组装磺化的Ti ₃ C ₂ T _x （ STi ₃ C ₂ T _x）纳米片成功解决了这一弱点。尼龙66微滤膜（N66）。经QCS修改的N66，可提供连续的位点和STi ₃ C赋予静电排斥力和离子空间效应的₂ T _x层状离子通道可协同提高复合膜的通量和选择性。具体地，所得到的2D薄阴离子层状复合膜（N66-QCS /性病₃ c ^ ₂ Ť _X）实现了高氯^- / SO ₄ ^2-选择性和Cl ^- 14.67通量和20.35×10 ^-8 摩尔小号^-1 厘米^－2，比市售Neosepta ACS高1.94和3.08倍（7.56和6.60×10 ^-8  mol cm ^-2  s ^-1）。此外，带负电的N66-QCS / STi ₃ C ₂ T _x显示出良好的亲水性和足够的防污潜力。制备磺化的Ti ₃ C ₂ T _x阴离子交换膜的策略为合理设计旨在获得较高综合性能的分离膜提供了基础信息。