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Custom-Made Ion Exchange Membranes at Laboratory Scale for Reverse Electrodialysis

机译：实验室规模的定制离子交换膜用于反向电渗析

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摘要

Salinity gradient power is a renewable, non-intermittent, and neutral carbon energy source. Reverse electrodialysis is one of the most efficient and mature techniques that can harvest this energy from natural estuaries produced by the mixture of seawater and river water. For this, the development of cheap and suitable ion-exchange membranes is crucial for a harvest profitability energy from salinity gradients. In this work, both anion-exchange membrane and cation-exchange membrane based on poly(epichlorohydrin) and polyvinyl chloride, respectively, were synthesized at a laboratory scale (255 ) by way of a solvent evaporation technique. Anion-exchange membrane was surface modified with poly(ethylenimine) and glutaraldehyde, while cellulose acetate was used for the cation exchange membrane structural modification. Modified cation-exchange membrane showed an increase in surface hydrophilicity, ion transportation and permselectivity. Structural modification on the cation-exchange membrane was evidenced by scanning electron microscopy. For the modified anion exchange membrane, a decrease in swelling degree and an increase in both the ion exchange capacity and the fixed charge density suggests an improved performance over the unmodified membrane. Finally, the results obtained in both modified membranes suggest that an enhanced performance in blue energy generation can be expected from these membranes using the reverse electrodialysis technique.
机译：盐度梯度发电是一种可再生，非间歇性和中性的碳能源。反向电渗析是最有效和最成熟的技术之一，可以从海水和河水的混合物产生的天然河口中吸收这种能量。为此，廉价和合适的离子交换膜的开发对于盐度梯度的收获获利能量至关重要。在这项工作中，通过溶剂蒸发技术，分别在实验室规模（255）下合成了分别基于聚表氯醇和聚氯乙烯的阴离子交换膜和阳离子交换膜。阴离子交换膜用聚乙烯亚胺和戊二醛进行了表面改性，而醋酸纤维素用于阳离子交换膜的结构改性。改性的阳离子交换膜显示出表面亲水性，离子迁移和渗透选择性的增加。阳离子交换膜的结构修饰通过扫描电子显微镜证实。对于改性的阴离子交换膜，溶胀度的降低以及离子交换容量和固定电荷密度的增加表明与未改性的膜相比，性能得到了改善。最后，在两种改性膜上获得的结果表明，使用反向电渗析技术可以预期这些膜在蓝色能量产生方面具有增强的性能。

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