Nacre‐Inspired Biomineralized Mesh toward Scalable and Robust Oil–Water Separation with High Efficiency

Abstract The leakage of offshore crude oil and the discharge of industrial oily wastewater always bring great harm to human health and ecological environment. To solve these problems, advanced interfacial materials for oil–water separation have attracted wide attentions. However, most of these materials still have several disadvantages including complicated preparation process, low separation efficiency, and easy damage. Herein, a nacre‐inspired biomineralized mesh (NBM) with underwater superoleophobicity shows scalable and robust oil–water separation with high efficiency. Through the combination of dip coating and biomineralization, the NBM is readily scalable fabrication. Similar chemical components and micro‐nanostructures to the natural nacre endow the NBM with good mechanical properties. Furthermore, the NBM can resist to sand impingement and knife scratch along high efficiency of oil–water separation (≈99.9%) even after repeated use for 50 times, which may come from its high hardness and Young's modulus. Therefore, this study provides new insights for the scalable development of oil–water separation materials with high efficiency and robustness.