Superwettable surfaces have high application potential in liquid separation and dye adsorption, but considerable challenges remain in separately and quickly removing different contaminants in industrial wastewaters such as effluents from textile dying and wool scouring processes. Herein, a robust, all-state superhydrophobic-superoleophilic (SHP-SOI) composite coating was fabricated, using cobalt 2-methylimidazole nanoparticles (ZIF-67 NPs), polydimethylsiloxane (PDMS) and octadecylamine (ODA), and applied to various substrates a facile two-step dip-coating method. The ZIF-67/PDMS-ODA coated fabrics turned superhydrophobic with a water contact angle (WCA) of over 150°, and oils could easily spread into the fabric with an oil contact angle (OCA) of 0° either in air or water. Owing to the synergistic effect of the coating components, the coating showed ultrafast and repeatable adsorption to anionic dyes ( methyl orange, MO) with the maximum equilibrium adsorption capacity of 205.7 mg/g (MO concentration 100 mg/L, pH = 3). More importantly, 97.9 % of MO was adsorbed in only 5 min and the adsorption reached equilibrium in 30 min. In addition, owing to the coating’s strong affinity toward different oils, the treated fabrics could efficiently separate/adsorb oils from oil contaminated dye solutions. This all-state SHP-SOI coating was robust and could withstand various severe treatments without losing its original wettability and dye/oil adsorption/separation capability; it also exhibited heat induced self-healable property.

中文翻译：

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坚固的全态超疏水-超亲油涂层，用于超快选择性染料吸附和含油废水净化

超润湿表面在液体分离和染料吸附方面具有很高的应用潜力，但在单独快速去除工业废水（例如纺织印染和羊毛洗练废水）中的不同污染物方面仍然存在相当大的挑战。在此，使用钴2-甲基咪唑纳米颗粒（ZIF-67 NP）、聚二甲基硅氧烷（PDMS）和十八胺（ODA）制备了坚固的全态超疏水-超亲油（SHP-SOI）复合涂层，并将其应用于各种基材上简便的两步浸涂方法。 ZIF-67/PDMS-ODA涂层织物具有超疏水性，水接触角（WCA）超过150°，无论在空气中还是水中，油接触角（OCA）为0°的油都可以很容易地扩散到织物中。由于涂层组分的协同作用，涂层对阴离子染料（甲基橙，MO）表现出超快速、可重复的吸附，最大平衡吸附容量为205.7 mg/g（MO浓度100 mg/L，pH = 3）。更重要的是，仅5分钟就吸附了97.9%的MO，并在30分钟内达到吸附平衡。此外，由于涂层对不同油类有很强的亲和力，处理过的织物可以有效地从油污染的染料溶液中分离/吸附油类。这种全态SHP-SOI涂层坚固耐用，可以承受各种严酷的处理，而不失去其原有的润湿性和染料/油吸附/分离能力；它还表现出热诱导自愈特性。