Abstract The study presents in situ modification of a spiral-wound seawater reverse osmosis (SWRO) membrane elements using sorption of hydrophobic long-chain aliphatic amine molecules as a generic approach to increasing selectivity, in particular, boron removal. Spiral-wound seawater SW30 elements modified using decylamine and dodecylamine showed 2–4 times lower boron passage for the modified elements at the expense of a moderate drop in permeability. Autopsy indicated no change in surface morphology and chemistry, suggesting immobilization of the modifying molecules within the active layer. Overall, the reported in situ modification of the SWRO element resulted in a superior trade-off between permeability and boron passage and no change in salt rejection, as compared to regular polyamide membranes. The enhanced selectivity toward boron5 removal could potentially help eliminate or reduce the costs related to the second pass in sea water desalination.

中文翻译：

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原位改进膜元件以提高反渗透海水淡化中的硼截留率

摘要 本研究介绍了螺旋缠绕式海水反渗透 (SWRO) 膜元件的原位改性，使用疏水性长链脂肪胺分子的吸附作为提高选择性，特别是去除硼的通用方法。使用癸胺和十二胺改性的螺旋缠绕海水 SW30 元件显示，改性元件的硼通过率降低了 2-4 倍，但渗透率适度下降。尸检表明表面形态和化学性质没有变化，表明活性层内的改性分子固定化。总体而言，与常规聚酰胺膜相比，所报道的 SWRO 元件的原位改性在渗透性和硼通过之间取得了优异的平衡，并且盐截留率没有变化。