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Asymmetric Membrane Capacitive Deionization Using Anion-Exchange Membranes Based on Quaternized Polymer Blends
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-06-01 00:00:00 , DOI: 10.1021/acsapm.0c00432 Robert McNair 1, 2 , Levente Cseri 1 , Gyorgy Szekely 1, 3 , Robert Dryfe 2, 4, 5
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-06-01 00:00:00 , DOI: 10.1021/acsapm.0c00432 Robert McNair 1, 2 , Levente Cseri 1 , Gyorgy Szekely 1, 3 , Robert Dryfe 2, 4, 5
Affiliation
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Membrane capacitive deionization (MCDI) for water desalination is an innovative technique that could help to solve the global water scarcity problem. However, the development of the MCDI field is hindered by the limited choice of ion-exchange membranes. Desalination by MCDI removes the salt (solute) from the water (solvent); this can drastically reduce energy consumption compared to traditional desalination practices such as distillation. Herein, we outline the fabrication and characterization of quaternized anion-exchange membranes (AEMs) based on polymer blends of polyethylenimine (PEI) and polybenzimidazole (PBI) that provides an efficient membrane for MCDI. Flat sheet polymer membranes were prepared by solution casting, heat treatment, and phase inversion, followed by modification to impart anion-exchange character. Scanning electron microscopy (SEM), atomic force microscopy (AFM), nuclear magnetic resonance (NMR), and Fourier-transform infrared (FTIR) spectroscopy were used to characterize the morphology and chemical composition of the membranes. The as-prepared membranes displayed high ion-exchange capacity (IEC), hydrophilicity, permselectivity and low area resistance. Due to the addition of PEI, the high density of quaternary ammonium groups increased the IEC and permselectivity of the membranes, while reducing the area resistance relative to pristine PBI AEMs. Our PEI/PBI membranes were successfully employed in asymmetric MCDI for brackish water desalination and exhibited an increase in both salt adsorption capacity (>3×) and charge efficiency (>2×) relative to membrane-free CDI. The use of quaternized polymer blend membranes could help to achieve greater realization of industrial scale MCDI.
中文翻译：
基于季铵化聚合物共混物的阴离子交换膜的不对称膜电容去离子
用于水脱盐的膜电容去离子（MCDI）是一项创新技术，可以帮助解决全球缺水问题。然而，离子交换膜的有限选择阻碍了MCDI领域的发展。MCDI脱盐可从水（溶剂）中除去盐（溶质）；与传统的脱盐方法（例如蒸馏）相比，这可以大大降低能耗。在这里，我们概述了基于聚乙烯亚胺（PEI）和聚苯并咪唑（PBI）的聚合物共混物的季铵化阴离子交换膜（AEM）的制造和表征，该聚合物共混物为MCDI提供了有效的膜。通过溶液流延，热处理和相转化，然后改性以赋予阴离子交换特性来制备平板聚合物膜。扫描电子显微镜（SEM），原子力显微镜（AFM），核磁共振（NMR）和傅立叶变换红外（FTIR）光谱用于表征膜的形态和化学组成。所制备的膜显示出高离子交换容量（IEC），亲水性，渗透选择性和低面积电阻。由于添加了PEI，高密度的季铵基团增加了膜的IEC和渗透选择性，同时相对于原始的PBI AEM降低了面积电阻。我们的PEI / PBI膜已成功用于不对称MCDI中，用于微咸水淡化，并且相对于无膜CDI，其盐吸附能力（> 3x）和电荷效率（> 2x）均增加。
更新日期：2020-06-01
中文翻译：
基于季铵化聚合物共混物的阴离子交换膜的不对称膜电容去离子
用于水脱盐的膜电容去离子（MCDI）是一项创新技术，可以帮助解决全球缺水问题。然而，离子交换膜的有限选择阻碍了MCDI领域的发展。MCDI脱盐可从水（溶剂）中除去盐（溶质）；与传统的脱盐方法（例如蒸馏）相比，这可以大大降低能耗。在这里，我们概述了基于聚乙烯亚胺（PEI）和聚苯并咪唑（PBI）的聚合物共混物的季铵化阴离子交换膜（AEM）的制造和表征，该聚合物共混物为MCDI提供了有效的膜。通过溶液流延，热处理和相转化，然后改性以赋予阴离子交换特性来制备平板聚合物膜。扫描电子显微镜（SEM），原子力显微镜（AFM），核磁共振（NMR）和傅立叶变换红外（FTIR）光谱用于表征膜的形态和化学组成。所制备的膜显示出高离子交换容量（IEC），亲水性，渗透选择性和低面积电阻。由于添加了PEI，高密度的季铵基团增加了膜的IEC和渗透选择性，同时相对于原始的PBI AEM降低了面积电阻。我们的PEI / PBI膜已成功用于不对称MCDI中，用于微咸水淡化，并且相对于无膜CDI，其盐吸附能力（> 3x）和电荷效率（> 2x）均增加。
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