Superhydrophobic polybenzoxazine (PBZ)/TiO₂ coatings with reversible wettability were fabricated by blending eugenol/siloxane-based benzoxazine (E-aptmds) with TiO₂ nanoparticles through spin coating and thermal curing processes. The resulting coatings could switch between superhydrophobicity and superhydrophilicity through alternate ultraviolet (UV) irradiation and heating treatment cycles. The PBZ/TiO₂ coating-modified stainless steel mesh (PBZ/TiO₂ mesh) had ultra-high oil/water separation fluxes of over 54,000 L/m² h only by gravity for several heavy oil/water mixtures. Meanwhile, the PBZ/TiO₂ mesh could efficiently collect various light oils from water with separation efficiencies of over 96.0%. Additionally, the PBZ/TiO₂ mesh could purify methylene blue-contaminated water through UV irradiation. Owing to the self-cleaning property of the PBZ/TiO₂ mesh, chemical and powdery pollutants could be easily dispelled. Furthermore, the as-prepared mesh exhibited strong durability under harsh treatments including high temperature, acid/alkali immersion, or organic solvent immersion. Hence, the PBZ/TiO₂ mesh owns a bright prospect in the application of oil/water separation.

中文翻译：

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具有可逆润湿性的超疏水聚苯并恶嗪/TiO ₂涂层，用于高通量油/水分离

通过旋涂和热固化工艺将丁子香酚/硅氧烷基苯并恶嗪（E-aptmds）与TiO ₂纳米颗粒混合，制备了具有可逆润湿性的超疏水性聚苯并恶嗪（PBZ）/TiO ₂涂层。所得涂层可以通过交替的紫外线 (UV) 照射和热处理循环在超疏水性和超亲水性之间切换。PBZ/TiO ₂涂层改性不锈钢网（PBZ/TiO ₂网）仅通过重力对几种重油/水混合物具有超过54,000 L/m ² h的超高油/水分离通量。同时，PBZ/TiO ₂滤网可以有效地从水中收集各种轻质油，分离效率超过96.0%。此外，PBZ/TiO ₂网可以通过紫外线照射净化受亚甲基蓝污染的水。由于PBZ/TiO ₂网的自洁性，化学和粉状污染物很容易被清除。此外，所制备的网格在包括高温、酸/碱浸渍或有机溶剂浸渍在内的苛刻处理下表现出很强的耐久性。因此，PBZ/TiO ₂网在油水分离应用中具有广阔的前景。