Abstract Membrane separation is regarded as an efficient technology in treating oily wastewater. However, the oil fouling of the membrane is an unavoidable issue during the separation process, which will largely reduce the permeation flux or even destruct membrane structure. While polyketone is a promising membrane material with favorable chemical resistance to be implemented in oil/water separation, its weak hydrophilicity and underwater oleophobicity limit the possibility of high-efficiency separation. In this work, a hydrophilic alginate hydrogel was successfully deposited onto the polyketone membrane through a facile electrostatic attraction force strategy. By optimizing the concentration of the alginate hydrogel, stable underwater superoleophobicity and ultralow oil adhesion of the membrane were obtained. The membrane showed the significantly improved separation efficiency for the rejection of various kinds of oil-in-water emulsions, indicating the effectiveness and durability of the method proposed in this work. It is expected that this modification method may also be applied for the improvement of other membrane materials.

中文翻译：

---

通过基于水凝胶的改性使聚酮膜具有水下超疏油性，用于高效水包油乳液分离

摘要 膜分离被认为是处理含油废水的有效技术。然而，膜的油污是分离过程中不可避免的问题，这将大大降低渗透通量甚至破坏膜结构。虽然聚酮是一种很有前途的膜材料，具有良好的耐化学性，可用于油/水分离，但其弱亲水性和水下疏油性限制了高效分离的可能性。在这项工作中，亲水性海藻酸盐水凝胶通过简单的静电吸引力策略成功地沉积在聚酮膜上。通过优化海藻酸盐水凝胶的浓度，获得了稳定的水下超疏油性和超低的油膜附着力。该膜显示出对各种水包油乳液的截留率显着提高的分离效率，表明该方法的有效性和耐久性。预计这种改性方法也可以应用于其他膜材料的改进。