Developing a new type of superhydrophilic/underwater superoleophobic oil/water separation membrane with high separation efficiency, high throughput and bacteria separation has essential theoretical and practical significance for treating oily and medical wastewater. This work modified commercial PVDF membranes by knife coating and cross-linking, and PVDF/PVA/LPB/MOF hybrid separation membranes are manufactured. Hydrophilic polyvinyl alcohol (PVA) endows the separation membrane with good hydrophilicity. Lauramidopropyl Betaine (LPB) enhances intermolecular hydrogen bonding and improves the mechanical properties of the membrane. A Metal-organic framework (MOF) with excellent biocompatibility, UiO-66-NH₂, plays a vital role in the separation of bacteria. The results of the morphology and surface chemistry of characterization analysis show that the PVDF/PVA/LPB/MOF hybrid separation membrane exhibits excellent superhydrophilicity (with a contact angle of 2°) and high-water flux (15600 L/m²h) and high separation efficiency (99%), and the nature of filtering bacteria while separating oil. After modification, the separation efficiency increased from 30% to 99%, showing strong oil stain resistance. Our finding suggests that the new type of super-hydrophilic/underwater superoleophobic oil/water separation membrane has potential value in practical applications.

开发一种具有高分离效率、高通量和细菌分离的新型超亲水/水下超疏油油水分离膜，对于处理含油和医疗废水具有重要的理论和实践意义。本工作通过刮涂和交联对商用PVDF膜进行改性，制备出PVDF/PVA/LPB/MOF混合分离膜。亲水性聚乙烯醇（PVA）赋予分离膜良好的亲水性。月桂酰胺丙基甜菜碱 (LPB) 可增强分子间氢键并改善膜的机械性能。具有优异生物相容性的金属有机骨架 (MOF)，UiO-66-NH ₂，在细菌的分离中起着至关重要的作用。表征分析的形貌和表面化学结果表明，PVDF/PVA/LPB/MOF杂化分离膜具有优异的超亲水性（接触角为2°）和高水通量（15600 L/m ² h）和分离效率高（99%），分离油液同时过滤细菌的特性。改性后分离效率由30%提高到99%，抗油污能力强。我们的研究结果表明，新型超亲水/水下超疏油油水分离膜在实际应用中具有潜在价值。