Song Jiajia, Liu Na, Li Jiakai, Cao Yingze, Cao Haijie
Institute of Materials for Energy and Environment, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
Department of Chemistry, Tsinghua University, Beijing 100084, China.
Nanomaterials (Basel). 2022 Feb 24;12(5):761. doi: 10.3390/nano12050761.
Although sundry superhydrophobic filtrating materials have been extensively exploited for remediating water pollution arising from frequent oil spills and oily wastewater emission, the expensive reagents, rigorous reaction conditions, and poor durability severely restrict their water purification performance in practical applications. Herein, we present a facile and cost-effective method to fabricate highly hydrophobic onion-like candle soot (CS)-coated mesh for versatile oil/water separation with excellent reusability and durability. Benefiting from a superglue acting as a binder, the sub-micron CS coating composed of interconnected and intrinsic hydrophobic carbon nanoparticles stably anchors on the surface of porous substrates, which enables the mesh to be highly hydrophobic (146.8 ± 0.5°)/superoleophilic and resist the harsh environmental conditions, including acid, alkali, and salt solutions, and even ultrasonic wear. The as-prepared mesh can efficiently separate light or heavy oil/water mixtures with high separation efficiency (>99.95%), among which all the water content in filtrates is below 75 ppm. Besides, such mesh retains excellent separation performance and high hydrophobicity even after 20 cyclic tests, demonstrating its superior reusability and durability. Overall, this work not only makes the CS-coated mesh promising for durable oil/water separation, but also develops an eco-friendly approach to construct robust superhydrophobic surfaces.
尽管各种超疏水过滤材料已被广泛用于修复频繁发生的石油泄漏和含油废水排放所造成的水污染，但昂贵的试剂、苛刻的反应条件和较差的耐久性严重限制了它们在实际应用中的水净化性能。在此，我们提出了一种简便且经济高效的方法来制备高度疏水的洋葱状蜡烛烟灰（CS）涂层网，用于通用的油/水分离，具有出色的可重复使用性和耐久性。受益于用作粘合剂的强力胶，由相互连接且具有固有疏水性的碳纳米颗粒组成的亚微米CS涂层稳定地锚定在多孔基材表面，这使得该网具有高度疏水性（146.8±0.5°）/超亲油性，并能抵抗包括酸、碱和盐溶液在内的恶劣环境条件，甚至能抵抗超声磨损。所制备的网能够高效分离轻质或重质油/水混合物，分离效率高（>99.95%），其中滤液中的所有水含量均低于75 ppm。此外，即使经过20次循环测试，这种网仍保持优异的分离性能和高疏水性，证明了其卓越的可重复使用性和耐久性。总体而言，这项工作不仅使CS涂层网有望用于持久的油/水分离，还开发了一种生态友好的方法来构建坚固的超疏水表面。
