Luo Zhi-Yong, Lyu Shu-Shen, Mo Dong-Chuan
School of Materials, Sun Yat-sen University, Guangzhou 510275, P. R. China.
School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
ACS Omega. 2019 Nov 25;4(24):20486-20492. doi: 10.1021/acsomega.9b02152. eCollection 2019 Dec 10.
In recent years, superhydrophilic and underwater superoleophobic membranes have shown promising results in advanced oil/water separation. However, these membranes still have some drawbacks, like tedious preparation process and instability, which hinder their application in oil/water separation. Accordingly, the development of a facile approach to prepare superhydrophilic membranes with excellent oil/water separation performance is still coveted. Here, a copper mesh decorated with cauliflower-like nickel (Cu mesh@CF-Ni) is synthesized via a facile one-step electrodeposition method. Due to the surface polar -OH and -O-Ni-F groups of the Ni(OH)/NiO F shell of the cauliflower-like nickel (CF-Ni), this Cu mesh@CF-Ni displays superhydrophilic and underwater superoleophobic wettability. The results show that the Cu mesh@CF-Ni has excellent oil/water separation efficiency (higher than 99.2%) and ultrahigh water flux (around 20 L h cm). Moreover, it also displays good stability in a 10 wt % NaCl solution and 1 M NaOH solution for oil/water separation. By introducing the CF-Ni with polar Ni(OH)/NiO F components onto the surface of the materials via a simple electrodeposition method, the materials will acquire the capability to not only achieve oil/water separation but also realize many other applications, like self-cleaning, underwater bubble manipulation, and fog harvesting.
近年来，超亲水和水下超疏油膜在先进的油水分离方面显示出了令人期待的成果。然而，这些膜仍然存在一些缺点，比如制备过程繁琐和稳定性差，这阻碍了它们在油水分离中的应用。因此，开发一种简便的方法来制备具有优异油水分离性能的超亲水膜仍然是人们所渴望的。在此，通过一种简便的一步电沉积法合成了一种装饰有菜花状镍的铜网（铜网@CF-Ni）。由于菜花状镍（CF-Ni）的Ni(OH)/NiO F壳层表面存在极性的-OH和-O-Ni-F基团，这种铜网@CF-Ni表现出超亲水和水下超疏油的润湿性。结果表明，铜网@CF-Ni具有优异的油水分离效率（高于99.2%）和超高的水通量（约20 L h cm）。此外，它在用于油水分离的10 wt % NaCl溶液和1 M NaOH溶液中也表现出良好的稳定性。通过一种简单的电沉积方法将具有极性Ni(OH)/NiO F成分的CF-Ni引入材料表面，这些材料不仅将具备实现油水分离的能力，还能实现许多其他应用，如自清洁、水下气泡操控和雾气收集。
