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    Swelling Poly(ionic liquid) Supported by Three-Dimensional Wire Mesh for Oil/Water Separation

    Year: 2019

    Journal: ACS Appl. Mater. Interfaces, Volume 11, APR 17, page 14347–14353

    Authors: Zhang, Yongya; Deng, Xi; Zhang, Liren; Chen, Bihua; Ding, Tong; Ni, Bing; Gao, Guohua

    Organizations: National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21573072, 21773068]; National Key Research and Development Program of China [2017YFA0403102]; Shanghai Leading Academic Discipline ProjectShanghai Leading Academic Discipline Project [B409]

    Keywords: poly(ionic liquid); swelling; three-dimensional; superhydrophilic; oil/water separation

    A kind of oil/water separation membrane, combining poly(ionic liquid) (PIL) and three-dimensional (3D) wire mesh, was designed and prepared via one-step photopolymerization of an ionic liquid monomer 1,8-triethylene glycoldiyl-3,3'-divinylimidazolium dibromide ([DVIm-(EG)(3)]Br-2) with acrylic acid in the mesh. The composite membrane (PIL@Mesh) had the advantages of anti-oil-adhesion property and high mechanical strength simultaneously. The morphology of PIL@Mesh characterized by scanning electron microscopy (SEM) and Cryo-SEM demonstrated that PIL swelled in water to construct microscale 3D networks. The 3D networks of swelling PIL were capable of forming a hydration layer and endowed PIL@Mesh with superhydrophilicity, which made the membrane to transport water but to intercept oil. PIL@Mesh showed excellent separation efficiency (above 99.9%) for various oil/water mixtures, large water flux (47 Lm(-2)s(-1)), and high intrusion pressure (1.2 kPa). Meanwhile, it performed well in recyclability and corrosion-resistant under harsh conditions, such as acid, alkaline, and salty environments.
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