Most super-wetting membrane materials are susceptible to oil pollution after separation process, causing a serious degradation of the separation ability. The rough structure of underwater superoleophobic membrane can effectively improve anti-fouling property, thus achieving stable separation. Herein, a composite polyvinyl alcohol-graphene oxide-titanium dioxide (PVA-GO-TiO₂, PGT) membrane with rough structure is prepared through a simple hydrothermal and suction-filtration method. The as-prepared PGT membrane displays outstanding underwater superoleophobicity even for high-adhesion crude oil. Moreover, the as-fabricated membrane exhibits efficient oil-in-water emulsions separation performance with separation efficiency of larger than 99.1% and permeation flux of over than 762 L m⁻² h⁻¹ even after 10 min. Besides, the PGT membrane could separate various oil-in-water emulsions in corrosive environments with separation efficiency of higher than 99.3% and permeation flux of more than 760 L m⁻² h⁻¹. More importantly, the as-prepared membrane could keep the underwater superoleophobicity after sanding test (200 times) and bending test (500 times). The composite membrane with excellent oil-in-water emulsions separation performance, corrosion resistance and mechanical stability has broad prospects in the field of water purification.

大多数超润湿膜材料在分离过程后容易受到油污染，导致分离能力严重下降。水下超疏油膜的粗糙结构可有效提高防污性能，从而实现稳定分离。在此，通过简单的水热和抽滤方法制备了具有粗糙结构的聚乙烯醇-氧化石墨烯-二氧化钛（PVA-GO-TiO ₂，PGT）复合膜。所制备的 PGT 膜即使对于高粘附性原油也显示出出色的水下超疏油性。此外，所制备的膜表现出高效的水包油乳液分离性能，分离效率大于99.1%，渗透通量大于762 L m ^-2  h^-1即使在 10 分钟后。此外，PGT膜可以在腐蚀性环境中分离各种水包油乳液，分离效率高于99.3%，渗透通量超过760 L m ^-2  h ^-1。更重要的是，所制备的膜在打磨试验（200次）和弯曲试验（500次）后仍能保持水下超疏油性。该复合膜具有优异的水包油乳液分离性能、耐腐蚀性和机械稳定性，在水净化领域具有广阔的前景。