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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Low pressure UV-cured CS-PEO-PTEGDMA/PAN thin film nanofibrous composite nanofiltration membranes for anionic dye separation
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Low pressure UV-cured CS-PEO-PTEGDMA/PAN thin film nanofibrous composite nanofiltration membranes for anionic dye separation

机译：低压紫外光固化CS-PEO-PTEGDMA / PAN薄膜纳米纤维复合纳米过滤膜，用于阴离子染料的分离

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摘要

Novel low pressure UV-cured chitosan-polyethylene oxide-polytriethylene glycol dimethacrylate/polyacrylonitrile (CS-PEO-PTEGDMA/PAN) thin film nanofibrous composite nanofiltration membranes for anionic dye separation are demonstrated. Firstly, a double-layer mat containing an ultrathin electrosprayed CS-PEO-triethylene glycol dimethacrylate (TEGDMA) hydrophilic nanobeaded top layer and an electrospun PAN nanofibrous substrate layer was manufactured. Then the hydrophilic top layer was acidic moist-cured followed by hot pressing to form an integrated barrier film on the supporting layer. Here, acidic moisture was utilized to soften the nanobeads and facilitate the CS melting process. Finally, the top layer was UV-cured to form CS-PEO-PTEGDMA semi-interpenetrating polymer networks to physically crosslink CS. Different conditions were selected to achieve an optimized integrated barrier layer on PAN nanofibrous substrate. The optimized membrane possessed high nanofiltration performance for anionic dye separation with superior permeate flux (similar to 117.5 L m(-2) h(-1)) and high rejection (similar to 99.9%) to Direct Red 80 solutions under low applied pressure of 0.2 MPa for energy saving purposes. An adsorption-assisted nanofiltration process was proposed for the CS-PEO-PTEGDMA membranes to separate anionic dyes. Moreover, the resultant CS-PEO-PTEGDMA nanofiltration membranes exhibited excellent antifouling properties (the flux recovery ratio reached 96.0% after 3 runs for 18 h), and they also possessed good reusability over repeated operations with a simple regeneration process. This work may pave the way for other intriguing polymer materials and provide a practical feasibility for water purification.
机译：展示了用于阴离子染料分离的新型低压紫外固化壳聚糖-聚环氧乙烷-聚三乙二醇二甲基丙烯酸酯/聚丙烯腈（CS-PEO-PTEGDMA / PAN）薄膜纳米纤维复合纳米过滤膜。首先，制造包含超薄电喷雾CS-PEO-三乙二醇二甲基丙烯酸酯（TEGDMA）亲水纳米珠顶层和电纺PAN纳米纤维基材层的双层垫。然后将亲水性顶层酸性湿固化，然后热压以在支撑层上形成集成的阻挡膜。在这里，酸性水分被用来软化纳米珠并促进CS熔融过程。最后，将顶层紫外线固化以形成CS-PEO-PTEGDMA半互穿聚合物网络，以使CS物理交联。选择不同的条件以在PAN纳米纤维基材上获得优化的集成阻挡层。优化的膜具有高的纳滤性能，可用于阴离子染料分离，具有优异的渗透通量（类似于117.5 L m（-2）h（-1）），并且在低施加压力下对Direct Red 80溶液具有较高的截留率（类似于99.9％）。节能0.2 MPa。提出了一种吸附辅助的纳滤工艺，用于CS-PEO-PTEGDMA膜分离阴离子染料。此外，所得的CS-PEO-PTEGDMA纳滤膜表现出优异的防污性能（3次运行18小时后通量回收率达到96.0％），并且在通过简单的再生过程重复操作后也具有良好的可重复使用性。这项工作可能会为其他有趣的聚合物材料铺平道路，并为水净化提供切实可行的可行性。

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