Key Laboratory of Bio-based Material Science and Technology (Ministry of Education), Northeast Forestry University, Harbin 150040, China; Bioproducts Institute, Department of Chemical & Biological Engineering, Department of Chemistry, and Department of Wood Science, The University of British Columbia, Vancouver, British Columbia, V6T 1Z3, Canada.
Bioproducts Institute, Department of Chemical & Biological Engineering, Department of Chemistry, and Department of Wood Science, The University of British Columbia, Vancouver, British Columbia, V6T 1Z3, Canada.
Carbohydr Polym. 2023 Jan 1;299:120119. doi: 10.1016/j.carbpol.2022.120119. Epub 2022 Sep 17.
Membranes for water remediation require structural stability, efficient operation, and durability. In this work, we used cellulose nanocrystals (CNC) to reinforce hierarchical nanofibrous membranes based on polyacrylonitrile (PAN). Hydrolysis of the electrospun nanofibers (H-PAN) enabled hydrogen bonding with CNC and provided reactive sites for grafting cationic polyethyleneimine (PEI). In a further modification, anionic silica particles (SiO) were adsorbed on the fiber surfaces, obtaining CNC/H-PAN/PEI/SiO hybrid membranes, which developed swelling resistance (swelling ratio of 6.7 compared to 25.4 measured for a CNC/PAN membrane). Hence, the introduced hydrophilic membranes contain highly interconnected channels, they are non-swellable and exhibit mechanical and structural integrity. By contrast with untreated PAN membranes, those obtained after modification displayed high structural integrity and allowed regeneration and cyclic operation. Finally, wettability and oil-in-water emulsion separation tests demonstrated remarkable oil rejection and separation efficiency in aqueous media.
用于水修复的膜需要结构稳定性、高效操作和耐用性。在这项工作中，我们使用纤维素纳米晶体 (CNC) 来增强基于聚丙烯腈 (PAN) 的分层纳米纤维膜。静电纺丝纤维的水解 (H-PAN) 实现了与 CNC 的氢键相互作用，并提供了用于接枝阳离子聚乙烯亚胺 (PEI) 的反应性位点。在进一步的修饰中，阴离子二氧化硅颗粒 (SiO) 被吸附在纤维表面上，得到 CNC/H-PAN/PEI/SiO 杂化膜，其具有抗溶胀性（溶胀比为 6.7，而 CNC/PAN 膜的溶胀比为 25.4）。因此，引入的亲水膜含有高度互连的通道，它们不可溶胀，并且表现出机械和结构完整性。与未经处理的 PAN 膜相比，经过修饰后得到的膜显示出高的结构完整性，并允许再生和循环操作。最后，润湿性和水包油乳液分离测试表明，在水介质中具有优异的拒油和分离效率。
