Abstract This paper aims to investigate different strategies toward the enhancement of nitrate removal in a membrane capacitive deionization cell using different membrane functionalizing agents such as trimethylamine, triethylamine, and N,N,N′,N′-tetramethyl-1,6-hexanediamine as well as a double-layer, novel homogeneous polysulfone-based anion exchange membrane. The prepared membranes exhibited nitrate versus chloride transport number ratio in the range of 0.96–1.52. The salt adsorption capacity for the NaNO3 feed was about 1.4-fold compared to that of using NaCl in case of triethylamine functionalized membrane under individual feeding solutions of 30 mL NaCl or NaNO3 during 30 min, and adsorption/desorption voltages of 1.6/0.0 V process conditions. At the same time, this parameter was about 1.2-fold weaker for the cell with a double-layer membrane. Based on the experiments, it can be inferred that the affinity toward nitrate could be promoted as the chain length of the alkyl group increases (i.e., increasing hydrophobicity of the groups). However, due to decrement in water uptake, the overall electrochemical performance of the membranes tended to weaken as the affinity toward nitrate increased. Results showed that the prepared membranes are suitable substitutions to conventional polystyrene-based ones utilized in membrane capacitive deionization cells.

中文翻译：

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应用于膜电容去离子池的均相聚砜基阴离子交换膜的电化学性能和硝酸盐去除率

摘要 本文旨在研究使用不同的膜功能化剂如三甲胺、三乙胺和 N,N,N',N'-四甲基-1,6-己二胺作为增强膜电容去离子电池中硝酸盐去除的不同策略。以及双层新型均质聚砜阴离子交换膜。制备的膜表现出硝酸盐与氯化物的迁移数比在 0.96-1.52 的范围内。在三乙胺功能化膜的情况下，在 30 分钟的 30 mL NaCl 或 NaNO3 单独进料溶液和 1.6/0.0 V 过程的吸附/解吸电压下，NaNO3 进料的盐吸附能力是使用 NaCl 的约 1.4 倍使适应。同时，这个参数大约是1。对于具有双层膜的电池，强度降低了 2 倍。根据实验可以推断，随着烷基链长的增加（即增加基团的疏水性），可以促进对硝酸盐的亲和力。然而，由于吸水量的减少，随着对硝酸盐的亲和力增加，膜的整体电化学性能趋于减弱。结果表明，所制备的膜适合替代用于膜电容去离子电池的常规聚苯乙烯基膜。随着对硝酸盐的亲和力增加，膜的整体电化学性能趋于减弱。结果表明，所制备的膜适合替代用于膜电容去离子电池的常规聚苯乙烯基膜。随着对硝酸盐的亲和力增加，膜的整体电化学性能趋于减弱。结果表明，所制备的膜适合替代用于膜电容去离子电池的常规聚苯乙烯基膜。