Abstract Recently, monovalent anion selective membranes (MASMs) with excellent permselectivity for selectrodialysis applications have become both very desirable and competitive. In this study, a series of polyvinyl alcohol-based MASMs were fabricated by depositing a thin electronegative layer with a loose structure on the surface of base membranes through interfacial polymerization. The base membranes were prepared by blending quaternized polyethyleneimine (QPEI) and polyvinyl alcohol (PVA) or modified PVA with hydrophobic alkyl chains of different lengths. Due to the hydration energy effect, the base membrane QPEI/PVA-C10, which had the longest hydrophobic alkyl chain, showed the highest permselectivity, 2.47, for a Cl−/SO42− system. The thin loose porous electronegative layer for as-prepared MASMs inhibited the transfer flux of large SO42− from 4.91 × 10−8 (QPEI/PVA) to 1.96 × 10−8 mol/cm2s (QPEI/PVA-5), but scarcely diminished that of Cl− (4.84–4.56 × 10−8 mol/cm2s for QPEI/PVA series membranes). Because of the hydration energy and Donnan exclusion effects, the membrane QPEI/PVA-C10-5, which used the longest hydrophobic alkyl chain and largest 4D2SA concentration, showed the highest permselectivity, specifically 6.31, higher than that of commercial Neosepta ACS (5.27) as well as an acceptable membrane area resistance of 5.11 ± 0.07 Ω cm2. Moreover, QPEI/PVA-C10-5 and QPEI/PVA-5 both illustrated a reasonable long-term operational stability for commercial selectrodialysis applications. This work suggests an effective approach to guide the fabrication of MASMs in selectrodialysis applications.

中文翻译：

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聚乙烯醇基一价阴离子选择性膜在选择性渗析中具有优异的渗透选择性

摘要 最近，具有优异渗透选择性的单价阴离子选择性膜 (MASM) 在选择性渗析应用中变得非常受欢迎且具有竞争力。在这项研究中，通过界面聚合在基膜表面沉积具有松散结构的薄电负性层，制备了一系列基于聚乙烯醇的 MASM。基膜由季铵化聚乙烯亚胺（QPEI）和聚乙烯醇（PVA）或具有不同长度疏水烷基链的改性PVA共混制备。由于水化能效应，具有最长疏水烷基链的基膜 QPEI/PVA-C10 对于 Cl-/SO42- 系统显示出最高的渗透选择性，为 2.47。制备的 MASM 的薄松散多孔带负电层抑制了大 SO42− 从 4.91 × 10−8 (QPEI/PVA) 到 1.96 × 10−8 mol/cm2s (QPEI/PVA-5) 的转移通量，但几乎没有减少Cl−（QPEI/PVA 系列膜为 4.84–4.56 × 10−8 mol/cm2s）。由于水化能和唐南排斥效应，使用最长疏水烷基链和最大 4D2SA 浓度的膜 QPEI/PVA-C10-5 表现出最高的渗透选择性，特别是 6.31，高于商业 Neosepta ACS (5.27)以及可接受的膜面积电阻为 5.11 ± 0.07 Ω cm2。此外，QPEI/PVA-C10-5 和 QPEI/PVA-5 都说明了商业选择性透析应用的合理长期操作稳定性。