Abstract Traditional polymer membranes suffer from low flux and oil fouling when utilized for separating oil/water emulsion. Herein, a novel and simple method is exploited to design a novel polymer composite membrane with superhydrophilic and underwater superoleophobic property for oil in water emulsion separation by depositing polydopamine (PDA) on hydrophobic polytetrafluoroethylene(PTFE) membrane surface in tetrahydrofuran (THF)-Tris buffer mixture. In comparison with the traditional PDA coating on hydrophobic membrane in a Tris buffer solution, a PDA layer with mass of hydrophilic carboxyl groups and nano-microspheres hierarchical structure is formed on hydrophobic PTFE membrane by PDA coating in a miscible THF-Tris buffer mixed solution, and endows PTFE membranes with excellent superhydrophilic and underwater superoleophobic property. Therefore, the as-prepared membranes can be applied in varieties of oil-in-water emulsions separation with ultrahigh permeate flux (above 2250 L/m2 h) under ultralow operating pressure (only 0.04 MPa) and excellent oil rejection. Finally, thanks to the low oil adhesion of the PDA layer, the resulting membranes display outstanding antifouling performance and reusability for oil water separation. On the whole, a novel rational methodology is provided to tailor PDA coatings with superhydrophilic and underwater superoleophobic property on hydrophobic membrane surface in tetrahydrofuran-Tris buffer mixture.

中文翻译：

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受贻贝启发的 PTFE 膜在可混溶的 THF-Tris 缓冲混合物中改性，用于水包油乳液分离

摘要 传统的聚合物膜在用于分离油/水乳液时存在通量低和油污等问题。在此，通过在四氢呋喃 (THF)-Tris 缓冲液中将聚多巴胺 (PDA) 沉积在疏水性聚四氟乙烯 (PTFE) 膜表面，开发了一种新颖且简单的方法，设计了一种具有超亲水和水下超疏油性能的新型聚合物复合膜，用于水包油乳液分离。混合物。与传统的PDA在Tris缓冲溶液中的疏水膜上涂层相比，在可混溶的THF-Tris缓冲混合溶液中，PDA涂层在疏水的PTFE膜上形成了具有大量亲水性羧基和纳米微球分级结构的PDA层，并赋予 PTFE 膜优异的超亲水性和水下超疏油性。因此，所制备的膜可在超低操作压力（仅0.04 MPa）下具有超高渗透通量（高于2250 L/m2 h）和优异的油截留率，适用于各种水包油乳状液分离。最后，由于 PDA 层的低油粘附性，所得膜显示出出色的防污性能和油水分离的可重复使用性。总的来说，提供了一种新的合理方法来在四氢呋喃-Tris 缓冲混合物中在疏水膜表面定制具有超亲水和水下超疏油特性的 PDA 涂层。由于 PDA 层的低油粘附性，所得膜显示出出色的防污性能和油水分离的可重复使用性。总的来说，提供了一种新的合理方法来在四氢呋喃-Tris 缓冲混合物中在疏水膜表面定制具有超亲水和水下超疏油特性的 PDA 涂层。由于 PDA 层的低油粘附性，所得膜显示出出色的防污性能和油水分离的可重复使用性。总的来说，提供了一种新的合理方法来在四氢呋喃-Tris 缓冲混合物中在疏水膜表面定制具有超亲水和水下超疏油特性的 PDA 涂层。