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Hydrophobic Side Chains Impart Anion Exchange Membranes with High Monovalent–Divalent Anion Selectivity in Electrodialysis
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-01-22 00:00:00 , DOI: 10.1021/acssuschemeng.8b06426 Muhammad Irfan 1 , Liang Ge 1 , Yaoming Wang 1 , Zhengjin Yang 1 , Tongwen Xu 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-01-22 00:00:00 , DOI: 10.1021/acssuschemeng.8b06426 Muhammad Irfan 1 , Liang Ge 1 , Yaoming Wang 1 , Zhengjin Yang 1 , Tongwen Xu 1
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Developing anion exchange membranes that have high anion selectivity and can avoid membrane swelling is a critical, but challenging, target for electrodialysis, which has witnessed great success in a wide range of applications including saline wastewater treatment and resource recovery. We found in this work that by tuning the hydrophobicity of alkyl spacers which connect the positively charged ammonium groups and polymeric backbones of the anion exchange membrane, high anion selectivity, and low membrane swelling of anion exchange membrane can be achieved. The membranes developed here are capable of discriminating monovalent and divalent anions, with a selectivity for Cl–/SO42– reaching up to 13.07, and our results suggest the chain length of the spacers determines the anion selectivity of membrane. We attribute such phenomenon to the change in side chain hydrophobicity. This is a particularly interesting finding that could facilitate the development of advanced anion exchange membranes for electrodialysis.
中文翻译：
疏水性侧链在电渗析中具有高一价-二价阴离子选择性的阴离子交换膜
开发具有高阴离子选择性并可以避免膜溶胀的阴离子交换膜是电渗析的关键但具有挑战性的目标，电渗析在包括盐废水处理和资源回收在内的广泛应用中已取得巨大成功。我们在这项工作中发现，通过调节连接带正电荷的铵基团和阴离子交换膜的聚合物主链的烷基间隔基的疏水性，可以实现阴离子交换膜的高阴离子选择性和低膜溶胀度。此处开发的膜能够区分一价和二价阴离子，并且对Cl – / SO 4 2–具有选择性。达到13.07，我们的结果表明，间隔基的链长决定了膜的阴离子选择性。我们将这种现象归因于侧链疏水性的变化。这是一个特别有趣的发现，可以促进用于电渗析的高级阴离子交换膜的开发。
更新日期：2019-01-22
中文翻译：
疏水性侧链在电渗析中具有高一价-二价阴离子选择性的阴离子交换膜
开发具有高阴离子选择性并可以避免膜溶胀的阴离子交换膜是电渗析的关键但具有挑战性的目标，电渗析在包括盐废水处理和资源回收在内的广泛应用中已取得巨大成功。我们在这项工作中发现，通过调节连接带正电荷的铵基团和阴离子交换膜的聚合物主链的烷基间隔基的疏水性，可以实现阴离子交换膜的高阴离子选择性和低膜溶胀度。此处开发的膜能够区分一价和二价阴离子，并且对Cl – / SO 4 2–具有选择性。达到13.07，我们的结果表明，间隔基的链长决定了膜的阴离子选择性。我们将这种现象归因于侧链疏水性的变化。这是一个特别有趣的发现，可以促进用于电渗析的高级阴离子交换膜的开发。
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