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Novel targeted modification strategy improves selectivity of polyamide nanofiltration membranes

Credit: WANG Jingyu Recently, a research group led by Prof. WAN Yinhua from the Institute of Process Engineering (IPE) of the Chinese Academy of Sciences developed a novel targeted modification strategy to improve the separation selectivity of polyamide NF membranes. The study was published in Journal of Membrane Science on March 10. The low selectivity of commercial nanofiltration (NF) membranes to monosaccharides and monovalent salts is mainly due to the nonuniform pore size distribution and strong electronegativity. Targeted modification can regulate the pore size distribution and electronegativity of polyamide NF membranes, and thus improve the separation selectivity. In the strategy, carboxyl groups (-COOH) on the surface are activated by N-(3-Dimethylaminopropyl)-N -ethyl carbodiimide (EDC) and N-Hydroxy succinimide (NHS), and subsequently grafted onto monomer or polymer containing amino groups (-NH

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