A superoleophobic underwater modified electrospun membrane is produced via a novel effective modification method, to overcome the hydrophobicity and fouling propensity of the electrospun polysulfone (PSf) membrane. In which the fabricated PSf electrospun membranes were immersed in different NaOH concentrations (0, 0.1, 0.5, and 1 M) at different temperatures (25, 50, 75, and 100 °C) for different time (1, 3, 5, 7 h) to produce 64 modified membranes. Based on the characterization of the modified membranes, the best-modified membrane was chosen and was investigated in the oil-water separation system.

More importantly, the best-modified membrane (M64) exhibits underwater superoleophobic feature and it could effectively separate soybean oil and hexane-water mixtures with a superior water flux of 11,865 and 14,016 LMH after the 5th cycle under a gravity-driven process, respectively. Moreover, the membrane possesses remarkable oil-water separation efficiency with more than 99.99% of oil rejection, where soybean oil and hexane content in the filtrate after the 5th cycle were less than 3 and 1 ppm, respectively, which is lower than the acceptable limit of 10 ppm. Also, the modified membrane exhibited antifouling properties with a water flux recovery ratio of 94 and 96.8% after the 5th filtration cycles of soybean oil and hexane-water mixtures. Overall, this study introduces a simple and effective method to overcome the hydrophobicity of the PSf electrospun membrane and enhance the antifouling property.

通过一种新型的有效改性方法，生产了一种超疏油性水下改性电纺膜，以克服电纺聚砜（PSf）膜的疏水性和结垢倾向。将制成的PSf电纺膜在不同的温度（25、50、75和100°C），不同的时间（1、3、5、7）中浸入不同的NaOH浓度（0、0.1、0.5和1 M）中h）生产64个改性膜。基于改性膜的表征，选择了最佳改性膜，并在油水分离系统中进行了研究。

更重要的是，经过最佳改性的膜（M64）具有水下超疏油功能，在重力驱动的第5个循环后，它可以有效分离大豆油和己烷-水混合物，分别具有11,865和14016 LMH的优良水通量。此外，该膜具有卓越的油水分离效率，排油率超过99.99％，第5个循环后滤液中的大豆油和己烷含量分别小于3和1 ppm，低于可接受的极限10 ppm。同样，在大豆油和己烷-水混合物的第5次过滤循环之后，改性膜表现出防污性能，水通量回收率分别为94和96.8％。全面的，