{"title":"Low Fouling Molecular Selective Channels through Self-assembly of Cross-linked Block Copolymer Micelles for Selective Separation of Dye and Salt","authors":"Anuradha, Urvashi S. Joshi, Suresh K. Jewrajka","doi":"10.1021/acsami.4c14085","DOIUrl":null,"url":null,"abstract":"We report the solvent-evaporation and ionic cross-linking mediated self-assembly of the shell cross-linked micelles of the amphiphilic triblock copolymer containing middle poly(methyl methacrylate) block (hydrophobic) and poly(2-dimethylamino)ethyl methacrylate end blocks (hydrophilic) on the membrane substrate to create molecular selective channels. The formation of selective channels on the substrate is attributed to the local increase of micelle concentration upon solvent evaporation, which leads to the core–core hydrophobic interaction. The post-ionic cross-linking of the shell part further reduces the intermicelle distance, thereby creating interstices for selective separation. The TUF-1:1 membrane prepared by the self-assembly of the cross-linked micelles (triblock copolymer:halide-terminated PEG-based = 1:1 w w<sup>–1</sup>) and by the post-ionic cross-linking shows molecular weight cutoff of 3000 g mol<sup>–1</sup> and pure water permeance of 52 L m<sup>–</sup><sup>2</sup> h<sup>–1</sup> bar<sup>–1</sup>. The membrane shows 99.5–99.9% rejection of Congo red and Direct red-80 in the presence or absence of salts and Na<sub>2</sub>SO<sub>4</sub> to dye separation factor of about 900. The added functionality (PEG) in the micelle structure provides good fouling-resistant properties toward dye and bovine serum albumin. This work provides the membrane formation mechanism and the advantages of the membrane for fractionation and resource recovery applications.","PeriodicalId":5,"journal":{"name":"ACS Applied Materials & Interfaces","volume":null,"pages":null},"PeriodicalIF":8.3000,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Materials & Interfaces","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1021/acsami.4c14085","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
我们报告了在溶剂蒸发和离子交联介导下,含有聚(甲基丙烯酸甲酯)中间嵌段(疏水性)和聚(2-二甲基氨基)乙基甲基丙烯酸酯末端嵌段(亲水性)的两亲性三嵌段共聚物的壳交联胶束在膜基底上的自组装,从而形成分子选择性通道。基底上选择性通道的形成归因于溶剂蒸发时胶束浓度的局部增加,这导致了核心与核心之间的疏水相互作用。外壳部分的后离子交联进一步缩小了胶束间的距离,从而形成了选择性分离的间隙。通过交联胶束(三嵌段共聚物:卤化物端基 PEG = 1:1 w w-1)的自组装和后离子交联制备的 TUF-1:1 膜的分子量截止值为 3000 g mol-1,纯水渗透率为 52 L m-2 h-1 bar-1。在盐和 Na2SO4 存在或不存在的情况下,该膜对刚果红和直接红-80 的抑制率为 99.5-99.9%,染料分离系数约为 900。胶束结构中添加的功能性物质(PEG)对染料和牛血清白蛋白具有良好的抗污性能。这项研究提供了膜的形成机理以及该膜在分馏和资源回收应用方面的优势。
Low Fouling Molecular Selective Channels through Self-assembly of Cross-linked Block Copolymer Micelles for Selective Separation of Dye and Salt
We report the solvent-evaporation and ionic cross-linking mediated self-assembly of the shell cross-linked micelles of the amphiphilic triblock copolymer containing middle poly(methyl methacrylate) block (hydrophobic) and poly(2-dimethylamino)ethyl methacrylate end blocks (hydrophilic) on the membrane substrate to create molecular selective channels. The formation of selective channels on the substrate is attributed to the local increase of micelle concentration upon solvent evaporation, which leads to the core–core hydrophobic interaction. The post-ionic cross-linking of the shell part further reduces the intermicelle distance, thereby creating interstices for selective separation. The TUF-1:1 membrane prepared by the self-assembly of the cross-linked micelles (triblock copolymer:halide-terminated PEG-based = 1:1 w w–1) and by the post-ionic cross-linking shows molecular weight cutoff of 3000 g mol–1 and pure water permeance of 52 L m–2 h–1 bar–1. The membrane shows 99.5–99.9% rejection of Congo red and Direct red-80 in the presence or absence of salts and Na2SO4 to dye separation factor of about 900. The added functionality (PEG) in the micelle structure provides good fouling-resistant properties toward dye and bovine serum albumin. This work provides the membrane formation mechanism and the advantages of the membrane for fractionation and resource recovery applications.
期刊介绍:
ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.