Li Jinhui, Yang Le, Liu Haifeng, Li Guobin, Li Rui, Cao Ying, Zeng Hui
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China.
College of Materials and Energy, South China Agricultural University, Guangzhou 510000, China.
ACS Appl Mater Interfaces. 2020 Oct 7;12(40):45266-45273. doi: 10.1021/acsami.0c11596. Epub 2020 Sep 23.
This work provides a simple method to prepare a hydrophilic/oleophobic coating using polyester filter cloth as the substrate, a mixture of three hydrophilic polymers (poly(aspartic acid), poly(acrylic acid), and poly(vinyl alcohol)); SiO with an average particle size of 30 nm is used to improve the surface roughness of the filter cloth. Then, a long fluorocarbon chain of 1,1,2,2-perfluorooctyltriethoxysilane is grafted onto the surface by a vacuum silanization coupling reaction to obtain hydrophilic/oleophobic properties. The water and hexadecane contact angles of the treated filter cloth are 3 and 99.8°, respectively. A separation efficiency of 98% was achieved in hexadecane/water separation. The durability test shows that the separation efficiency of toward hexadecane-water mixture remains more than 98% after 20 cycles. The obtained material also presents a strong underwater antipollution property when using hexane, rapeseed oil, mineral oil, and pump oil as model pollutants. For oils with higher viscosity, the separation efficiency remains above 97%. However, the separation efficiency is ∼80% when treating emulsions.
本工作提供了一种简单的方法，以聚酯滤布为基材，使用三种亲水性聚合物（聚天冬氨酸、聚丙烯酸和聚乙烯醇）的混合物制备亲水/疏油涂层；使用平均粒径为30nm的SiO来改善滤布的表面粗糙度。然后，通过真空硅烷化偶联反应将1,1,2,2-全氟辛基三乙氧基硅烷的长氟碳链接枝到表面，以获得亲水/疏油性能。处理后的滤布的水接触角和十六烷接触角分别为3°和99.8°。在十六烷/水分离中实现了98%的分离效率。耐久性测试表明，经过20次循环后，对十六烷-水混合物的分离效率仍保持在98%以上。当使用己烷、菜籽油、矿物油和泵油作为模型污染物时，所获得的材料还具有很强的水下抗污染性能。对于粘度较高的油，分离效率保持在97%以上。然而，处理乳液时的分离效率约为80%。
