Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 623, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2021.119073
Keywords
Membrane fabrication; Nanofiltration membrane; Surface modification; Interfacial polymerization; Thin-film composite membrane
Categories
Funding
- National Natural Science Foundation of China [21808060]
- Fundamental Research Funds for the Central Universities [222201814009, JKA012011001, JKA012011017]
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Surface modification via heat curing and grafting monoethanolamine (MEA) can enhance the pure water permeability and Na2SO4 rejection of polyamide nanofiltration membranes. The optimized membrane modified with 0.5 wt% MEA showed high Na2SO4 rejection and negative NaCl rejection when treating a mixed salt solution. This study provides insights for developing high permselectivity NF membranes through surface modification.
Surface modification is an efficient post-treatment method to optimize the properties of nanofiltration (NF) membranes. Here, we report a facile surface modification strategy coupling with heat curing for grafting monoethanolamine (MEA), a monomer containing both a primary amine and a primary alcohol group, onto a nascent polyamide NF membrane. With grafting 0.5 wt% MEA at 50 degrees C, the pure water permeability of the polyamide NF membranes was improved from 7.9 to 19.5 L m(-2) h(-1) bar(-1) due to their enhanced physicochemical property, such as superior hydrophilicity, rough surface morphology, and enlarged membrane pores. Meanwhile, the rejection of Na2SO4 remained above 97.5%. More importantly, the optimal membrane modified with 0.5 wt% MEA exhibited a high Na2SO4 rejection of 99.1% and a negative NaCl rejection of -20.1% when treating a mixed salt solution containing 2 g/L Na2SO4 and 2 g/L NaCl. Our study provides a novel insight for the fabrication of high permselectivity NF membranes via surface modification.
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