Three-dimensional porous materials with the hydrophobic/oleophilic surface have attracted significant interest in the fields of oil/water separation. In this paper, superhydrophobic magnetic polyurethane sponge was fabricated by the self-polymerization of dopamine to bind the Fe3O4 nanoparticles tightly on the sponge and then soaking in cheap stearic acid aqueous solution. The obtained sponge has the superhydrophobic property and good magnetic property. The surface structure, composition, and properties of the modified sponges were characterized by scanning electron microscopy, energy dispersive spectrometer, Fourier-transform infrared spectrum, and water contact angle (WCA) measurements. The as-prepared superhydrophobic magnetic sponge was able to collect a wide range of oils and organic solvents from oil–water mixture with an absorption capacity up to 16–60 times of its own weight. Under an external magnetic field, it can be guided to a designated area. In addition, combined with the vacuum system, continuous oil separation can be carried out, which is of great significance for removing a good deal of dirty oil on the water surface. Furthermore, the WCA of sponge remains above 141°, and the oil absorption is basically unchanged through repeated cyclic experiments.

具有疏水/亲油性表面的三维多孔材料在油/水分离领域引起了极大的兴趣。本文通过多巴胺的自聚合作用结合Fe 3 O 4制备了超疏水磁性聚氨酯海绵。将纳米颗粒紧紧地放在海绵上，然后浸泡在廉价的硬脂酸水溶液中。所得海绵具有超疏水性和良好的磁性。通过扫描电子显微镜，能量色散光谱仪，傅立叶变换红外光谱和水接触角（WCA）测量来表征改性海绵的表面结构，组成和性能。所制备的超疏水磁性海绵能够从油水混合物中收集各种油类和有机溶剂，吸收能力是其自重的16至60倍。在外部磁场下，它可以被引导到指定区域。此外，结合真空系统，可以连续进行油分离，这对于清除水面上的大量脏油具有重要意义。此外，海绵的WCA保持在141°以上，并且通过反复的循环实验，吸油率基本上没有变化。