A novel omniphobic-hydrophilic Janus membrane was developed to tackle the problems of traditional hydrophobic membrane wetting and fouling during membrane distillation (MD). The asymmetric membrane was first fabricated by simply depositing dopamine (DA) on a commercial polytetrafluoroethylene/polyethylene terephthalate (PTFE/PET) membrane. The low-surface-energy omniphobic surface with multilevel re-entrant structures was developed via spraying cylindrical palygorskite (PAL) nanorods, which were modified by polydopamine (PDA) coatings and fluorinated by 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (17FAS). The asymmetric Janus membrane possessed outstanding wettability: the top layer achieved omniphobic (163.9°) while the bottom layer displayed underwater superoleophobicity (157.2°). In direct contact membrane distillation (DCMD) operations, the Janus membrane exhibited a robust desalination performance (salt rejection of ~100%) and excellent stability (over 50 h) while treating different types of surfactant-stabilized mineral oil-in-water emulsions, demonstrating the superior wetting and fouling resistance of the membrane. Overall, the results exemplified an effective strategy for engineering Janus membranes with an omniphobic PAL and a hydrophilic PDA layer. Importantly, the Janus membrane shows broad application prospects in the field of MD processes for water recovery from industrial wastewater containing complex compounds.

为了解决传统的疏水性膜蒸馏过程中膜润湿和结垢的问题，开发了一种新型的憎水性亲水性Janus膜。首先通过简单地将多巴胺（DA）沉积在商用聚四氟乙烯/聚对苯二甲酸乙二醇酯（PTFE / PET）膜上来制造不对称膜。通过喷涂圆柱形坡缕石（PAL）纳米棒，开发了具有多级折返结构的低表面能全疏水性表面，该棒经聚多巴胺（PDA）涂层改性并被1 H，1 H，2 H，2 H氟化-全氟癸基三乙氧基硅烷（17FAS）。不对称的Janus膜具有出色的润湿性：顶层达到全疏水性（163.9°），而底层表现出水下超疏油性（157.2°）。在直接接触膜蒸馏（DCMD）操作中，Janus膜在处理不同类型的表面活性剂稳定的矿物水包油乳液时，显示出强大的脱盐性能（排盐率约100％）和出色的稳定性（超过50小时），证明了膜的优异的抗湿和抗污性。总的来说，该结果证明了一种工程化的策略，可用于工程化具有全疏水性PAL和亲水性PDA层的Janus膜。重要的，