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首页> 外文期刊>Journal of Applied Polymer Science >Green and feasible fabrication of loose nanofiltration membrane with high efficiency for fractionation of dye/NaCl mixture by taking advantage of membrane fouling
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Green and feasible fabrication of loose nanofiltration membrane with high efficiency for fractionation of dye/NaCl mixture by taking advantage of membrane fouling

机译：通过利用膜污垢，具有高效率的绿色和可行的松散纳滤膜的制造，用于分馏染料/ NaCl混合物

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Loose nanofiltration membrane emerges as required recently, since it is hard for conventional nanofiltration membrane to fractionate mixture of dyes and salts in textile wastewater treatment. However, the polymeric membranes unavoidably suffer from membrane fouling, which was caused by the adsorption of organic pollutants (like dyes). Normally, the dye fouling layer will shrink membrane pore size, thus resulting in flux decline and rejection increase. It is thought that membrane fouling may be a double-edged sword and can be an advantage if properly utilized. Thereby, loose nanofiltration membranes were constructed here by a green yet effective method to fractionate dyes/salt mixture by taking advantage of membrane fouling without using poisonous ingredients. A commercially available polyacrylonitrile (PAN) ultrafiltration membrane with high permeability was chosen as the substrate, and dyes were used to contaminate PAN substrate and formed a stable barrier layer when adsorption of dyes reached dynamic equilibrium. The resultant PAN-direct red 80 (DR80) composite membranes displayed superior permeability (similar to 128.4 L m(-2) h(-1)) and high rejection (similar to 99.9%) to DR80 solutions at 0.4 MPa. Moreover, PAN-DR80 membranes allowed fast fractionation of dyes/sodium chloride (NaCl) mixture, which maintained a negligible dye loss and a low NaCl rejection (similar to 12.4%) with high flux of 113.6 L m(-2) h(-1) at 0.4 MPa. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47438.
机译：近最近，松散的纳滤膜膨胀，因为常规纳米过滤膜很难在纺织废水处理中分馏染料和盐的混合物。然而，聚合物膜不可避免地遭受膜污染，这是由有机污染物的吸附（如染料）引起的。通常，染料污染层将收缩膜孔径，从而导致助焊剂下降和排斥增加。认为膜污染可能是双刃剑，如果适当使用，可以是优势。由此，通过在不使用有毒成分的情况下利用膜污染，通过绿色但有效的方法在此，通过绿色但有效的方法在此通过绿色但有效的方法构建松散的纳滤膜。选择具有高渗透性的市售聚丙烯腈（锅）超滤膜作为基材，用染料用于污染盘基材，并在染料吸附达到动力平衡时形成稳定的阻挡层。得到的泛直接红色80（DR80）复合膜显示出优异的渗透率（类似于128.4LM（-2）H（-1）H（-1）），并且在0.4MPa下的DR80溶液中的高排出（类似于99.9％）。此外，Pan-DR80膜允许快速分馏染料/氯化钠（NaCl）混合物，其保持可忽略不计的染料损失和低NaCl排斥（类似于12.4％），高通量为113.6L m（-2）H（ - 1）0.4MPa。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47438。

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