Facilitated transport membranes have been extensively applied in a myriad of industrial fields, in view of their distinctive capabilities of selective separation of target species (e.g., ions/small molecules). Despite much progress, it remains challenging to tackle the trade-off relationship between the stability and separation efficiency of these membranes. Herein, we propose a Janus facilitated transport membrane with asymmetric surface wettability and dense/porous structure by decorating a hydrophilic and dense polymer inclusion membrane (PIM) skin layer on the surface of a hydrophobic and microporous polyvinylidene fluoride (PVDF) membrane to achieve a notable balance between separation efficiency and leakage-resistance. With the hydrophilic PIM skin layer facing aqueous solutions whilst the hydrophobic PVDF membrane towards organic solution during separation process, the Janus facilitated transport membrane remarkably prevents the leakage of the liquids from 66.7% (using the plain PVDF membrane) to negligible. Through a rapid transformation of the transport mechanism from a short-term hopping in the dense PIM skin layer to an unobstructed motion in the microporous PVDF membrane matrix, the separation efficiency of the Janus facilitated transport membrane has been considerably enhanced from 25% (using the PIM) to about 70%. Investigation of the influencing factors on the structures, properties and separation performance of the Janus facilitated transport membrane suggests that the concentration of the PIM casting solution is of particular importance to the formation of the PIM skin layer and the asymmetric dense/porous structure of the membrane. In addition, the Janus facilitated transport membrane exhibits extraordinary mechanical properties and selectivity. Our work demonstrates that the Janus facilitated transport membrane holds great promise and a wide scope in versatile applications in water treatment, water-oil separation, and recovery of metal ions/small molecules in complex systems (e.g., water-oil-metal ions and water-oil-small molecules).

鉴于便利的转运膜具有选择性分离目标物种（例如离子/小分子）的独特能力，已广泛应用于众多工业领域。尽管取得了很大进展，但要解决这些膜的稳定性和分离效率之间的折衷关系仍然是挑战。本文中，我们提出了一种通过在疏水性和微孔性聚偏二氟乙烯（PVDF）膜的表面上装饰亲水性和致密的聚合物包容膜（PIM）皮层来实现具有不对称表面润湿性和致密/多孔结构的Janus促进运输膜。分离效率和防漏性之间的平衡。在分离过程中，亲水性PIM表皮层面对水溶液，而疏水性PVDF膜朝向有机溶液，Janus促进运输膜可显着防止液体从66.7％（使用普通PVDF膜）泄漏到可忽略不计。通过将运输机制从致密的PIM皮层中的短期跳跃快速转变为微孔PVDF膜基质中的无阻碍运动，Janus促进的运输膜的分离效率已从25％大大提高（使用PIM）到大约70％。调查影响结构的因素，Janus促进转运膜的特性和分离性能表明，PIM流延溶液的浓度对于PIM表皮层的形成和膜的不对称致密/多孔结构特别重要。另外，Janus促进运输膜表现出非凡的机械性能和选择性。我们的工作表明，Janus促进转运膜在水处理，水油分离以及复杂系统中的金属离子/小分子（例如水-油-金属离子和水）的通用应用中具有广阔的前景和广阔的前景-油小分子）。Janus促进转运膜表现出非凡的机械性能和选择性。我们的工作表明，Janus促进转运膜在水处理，水油分离以及复杂系统中金属离子/小分子的回收（例如水-油-金属离子和水）的多种应用中具有广阔的前景和广阔的前景-油小分子）。Janus促进转运膜表现出非凡的机械性能和选择性。我们的工作表明，Janus促进转运膜在水处理，水油分离以及复杂系统中的金属离子/小分子（例如水-油-金属离子和水）的通用应用中具有广阔的前景和广阔的前景-油小分子）。