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Nanofiltration Membranes with Modified Active Layer Using Aromatic Polyamide Dendrimers

机译：使用芳族聚酰胺树枝状聚合物修饰活性层的纳滤膜

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摘要

The modification of a commercial nanofiltration (NF) membrane (TFC-S) with shape-persistent dendritic molecules is reported. Amphiphilic aromatic polyamide dendrimers (G1-G3) are synthesized via a divergent approach and used for membrane active layer modification by direct percolation. The permeate samples collected from the percolation experiments are analyzed by UV-visible spectroscopy to monitor the influence of dendrimer generations on percolation behavior and active layer modification. Further characterization of modified membranes by Rutherford backscattering spectrometry and atomic force microscopy techniques reveals a relatively low-level accumulation of dendrimers inside the original TFC-S NF membrane active layer and subsequent formation of a coating of pure aramide dendrimers on top of the active layer. A PES-PVA ultrafiltration membrane is used as a control membrane support (without an NF active layer) showing that structural compatibility between the dendrimers and support plays an important role in the membrane modification process. The performance of the modified TFC-S membrane is evaluated on the basis of the rejection abilities for a variety of water contaminants having a range of molecular size and chemistry. As the water flux is inversely proportional to the thickness of the active layer, the amount of dendrimers deposited for specific contaminants are optimized to improve the solute rejection while maintaining high water flux.
机译：据报道，具有形状持久性树突状分子的商业纳米过滤（NF）膜（TFC-S）的改性。两性芳香族聚酰胺树枝状聚合物（G1-G3）通过发散方法合成，并通过直接渗滤用于膜活性层改性。通过紫外-可见光谱分析从渗透实验中收集的渗透样品，以监测树状聚合物的生成对渗透行为和活性层改性的影响。通过卢瑟福反向散射光谱法和原子力显微镜技术对改性膜的进一步表征表明，原始TFC-S NF膜活性层内部树枝状聚合物的含量相对较低，并且在活性层顶部随后形成了纯芳酰胺树枝状聚合物涂层。 PES-PVA超滤膜用作对照膜载体（无NF活性层），表明树状聚合物和载体之间的结构相容性在膜改性过程中起着重要作用。基于对具有一定分子尺寸和化学性质的各种水污染物的排斥能力，评价改性的TFC-S膜的性能。由于水通量与活性层的厚度成反比，因此针对特定污染物沉积的树枝状聚合物的量可得到优化，以改善溶质截留率，同时保持高水通量。

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  • 来源
    《Advanced Functional Materials》 |2013年第5期|598-607|共10页
  • 作者

    Yuan Gao; Ana M. Saenz de Jubera; Benito J. Marinas; Jeffrey S. Moore;

  • 作者单位

    Departments of Chemistry and Materials Science and Engineering and Center of Advanced Materials for the Purification of Water with Systems University of Illinois at Urbana-Champaign Urbana, IL 61801, USA;

    Department of Civil and Environmental Engineering and Center of Advanced Materials for the Purification of Water with Systems University of Illinois at Urbana-Champaign Urbana, IL 61801, USA;

    Department of Civil and Environmental Engineering and Center of Advanced Materials for the Purification of Water with Systems University of Illinois at Urbana-Champaign Urbana, IL 61801, USA;

    Departments of Chemistry and Materials Science and Engineering and Center of Advanced Materials for the Purification of Water with Systems University of Illinois at Urbana-Champaign Urbana, IL 61801, USA;

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