Membrane distillation (MD) has been identified as a promising technology to desalinate the saline wastewater owing to its unique advantages including its ability in treating hypersaline solutions, 100% (theoretical) solute rejection and mild operating conditions. However, polytetrafluoroethylene (PTFE) hydrophobic membranes used for MD process were prone to be wetted caused by fouling due to the amphiphilic organics in feed solution. Herein, we developed an effective approach to fabricate amphiphobic PTFE nanofibrous membrane with enhanced anti-wetting and anti-fouling. During which, polyacrylonitrile (PAN) fiber was co-electrospun into PTFE/PVA precursor membrane, and Stőber method was adopted for in-situ growing of SiO₂ nanoparticles (SiNPs). After sintering, the SiNPs were fixed on the surface of PAN and PTFE fibers through chemical bonds and adhesive forces, respectively, which constructed membrane surface micro/nano structure. And then, the trimethoxy (1H,1H,2H,2H-heptadecafluorodecyl) silane (17-FAS) was used to fluorinate SiNPs. The prepared PTFE membrane exhibited strong amphiphobicity with water contact angle of 166.9° and oil contact angle of 134.5°. The amphiphobic PTFE membranes behaved a stable flux and excellent salt rejection during the 24h MD experiment in treating hypersaline solution, saline containing surfactant and oily saline. Also, the membranes showed excellent stability and reusability in the three cycles test, showing good application prospect in MD process, especially in the harsh environment.

膜蒸馏 (MD) 已被确定为一种有前途的脱盐技术，因为它具有独特的优势，包括处理高盐溶液的能力、100%（理论）溶质排斥和温和的操作条件。然而，由于进料溶液中的两亲性有机物，用于 MD 工艺的聚四氟乙烯 (PTFE) 疏水膜容易因污垢而被润湿。在此，我们开发了一种有效的方法来制造具有增强的抗润湿和防污性能的两性 PTFE 纳米纤维膜。在此期间，聚丙烯腈（PAN）纤维共电纺成PTFE/PVA前驱体膜，并采用Stőber法原位生长SiO ₂纳米粒子（SiNP）。烧结后，SiNPs分别通过化学键和粘附力固定在PAN和PTFE纤维表面，构成膜表面微/纳米结构。然后，使用三甲氧基 (1H,1H,2H,2H-十七氟癸基) 硅烷 (17-FAS) 对 SiNPs 进行氟化。制备的PTFE膜表现出很强的两性，水接触角为166.9°，油接触角为134.5°。在处理高盐溶液、含表面活性剂的盐水和油性盐水的 24 小时 MD 实验期间，两性 PTFE 膜表现出稳定的通量和出色的盐截留率。此外，该膜在三循环试验中表现出优异的稳定性和可重复使用性，在MD过程中显示出良好的应用前景，尤其是在恶劣的环境中。