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• W2763310981 abstract "Commercial polyamide RO membranes, though effective in terms of flux and salt removal, have a few drawbacks, in particular, poor rejection of boron (B), thus they are often unable to remove B to the required level in a one-pass sea desalination process. This complicates the process and available solutions increase the cost of desalinated water significantly. Here we explore in-situ modification procedure that can significantly increase their boron rejection by incorporating suitable modifying molecules in the selective polyamide layer. We propose that aliphatic amines be used as such “plug” molecules that combine a bulky hydrophobic moiety with a reactive group that can chemically or physically bind to polyamide layer, tighten its structure and increase selectivity. Based on previous results, we hypothesize that hydrophobicity of the selective layer increased by the immobilized amine “plug”, along with reduced pore size, may help disrupt water-boric acid association and decouple water and boron permeation. The results show that the proposed treatment with sufficiently long (up to 10–12 carbons) aliphatic amines, using either covalent bonding or simple sorption, may indeed reduce the boron passage by a factor of 2–4, without impairing the salt rejection of the membrane. The improved selectivity comes at the expense of some flux reduction, but the flux-selectivity tradeoff improves compared with commercial polyamide membranes." @default.
• W2763310981 created "2017-10-20" @default.
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• W2763310981 date "2018-01-01" @default.
• W2763310981 modified "2023-10-18" @default.
• W2763310981 title "Modification of polyamide membranes by hydrophobic molecular plugs for improved boron rejection" @default.
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• W2763310981 doi "https://doi.org/10.1016/j.memsci.2017.10.003" @default.
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