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首页> 外文会议>American Chemical Society Meeting on Advanced Materials for Membrane Separations; 2001; Chicago,IL; US >Improving the Permselectivity of Commercial Cation-Exchange Membranes for Electrodialysis Applications
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Improving the Permselectivity of Commercial Cation-Exchange Membranes for Electrodialysis Applications

机译：提高用于电渗析应用的商品化阳离子交换膜的渗透选择性

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摘要

Cation-exchange membranes bearing sulfonate groups (Neosepta CMX) were modified by chemical polymerization of aniline at the surface of the membranes. The doped polyaniline (PANI) adsorbed at the surface of the membrane consists of a positively charged layer which acts as an electrostatic barrier for multivalent cations. The resulting composite membranes (CMX-PANI) were characterized by electrodialysis, scanning electron microscopy (SEM), exchange capacity measurements (EC) and X-ray photoelectron spectroscopy (XPS). The presence the PANI, layer was shown to improve the membrane permselectivity for protons vs. bivalent cations (Zn~(2+) and Cu~(2+)) by a factor of at least 20 after electrodialysis in acidic solutions. Optimization of the anilinium exchange time as well as the polymerization time were performed. It was also demonstrated that the blocking efficiency of the PANI layer depended on the thickness and uniformity of this layer.
机译：带有磺酸盐基团的阳离子交换膜（Neosepta CMX）通过苯胺在膜表面的化学聚合反应进行改性。吸附在膜表面的掺杂聚苯胺（PANI）由带正电的层组成，该层充当多价阳离子的静电屏障。通过电渗析，扫描电子显微镜（SEM），交换容量测量（EC）和X射线光电子能谱（XPS）对所得复合膜（CMX-PANI）进行表征。在酸性溶液中电渗析后，PANI层的存在可将质子与二价阳离子（Zn〜（2+）和Cu〜（2+））的膜通透性提高至少20倍。进行了最佳的苯胺交换时间以及聚合时间。还证明了PANI层的粘连效率取决于该层的厚度和均匀性。

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