Electrospun nanofiber membrane has been focused on the application of separation materials for oily sewage attributing the success to its unique advantages, including large porosity, high specific surface area and complex open channel structure. However, its inherent high flexibility and easy deformability are not conducive to the stable separation performance of materials. Herein, we have developed a facile “hot-pressing welding” strategy to prepare nanofibrous composite membrane with high structural stability, which exhibit excellent comprehensive separation performance in a wide pressure range. The maximum fluxes for emulsions with/without surfactant reach up to 2340 and 7500 L m⁻² h⁻¹, respectively, with separation efficiency higher than 99%. In combination of the strong supporting ability of MF layer and stable porous structure of NF layer, the PDA@PLA-CF can separate the surfactant-stabilized emulsion efficiently under very wide range of vacuum degree from only gravity to relatively high negative pressure of 50 kPa without obvious decrease in separation efficiency, indicating its good adaptability to complex environment.

电纺纳米纤维膜一直专注于含油污水分离材料的应用，并将其成功归功于其独特的优势，包括大孔隙率，高比表面积和复杂的明渠结构。但是，其固有的高柔韧性和易变形性不利于材料的稳定分离性能。在这里，我们已经开发了一种简便的“热压焊接”策略来制备具有高结构稳定性的纳米纤维复合膜，该膜在很宽的压力范围内具有出色的综合分离性能。含/不含表面活性剂的乳液的最大通量可达2340和7500 L m ^-2 h ^-1分离效率分别高于99％。结合MF层的强大支撑能力和NF层的稳定多孔结构，PDA @ PLA-CF可以在很宽的真空度范围（从重力到50 kPa相对较高的负压）下有效地分离表面活性剂稳定的乳液分离效率没有明显降低，表明其对复杂环境的良好适应性。