Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 595, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2019.117590
Keywords
Solvent activation; Reverse osmosis; Nanofiltration; Interfacial polymerization; Polyamide thin film composite membrane
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean government [2019R1A2C1002333, 2019M3E6A1064103, 2018R1A4A1022194]
- Korean Ministry of Environment [2016002100007]
- Korea Research Institute of Chemical Technology [KK1923-10]
- Korea Environmental Industry & Technology Institute (KEITI) [ARQ201606105005] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [KK1923-10] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2018R1A4A1022194] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We present a facile method for fabricating polyamide (PA) nanofiltration (NF) membranes exhibiting remarkable separation performance and high acid stability via solvent activation on PA reverse osmosis (RO) membranes with strong polar aprotic solvents (dimethyl sulfoxide (DMSO), dimethylformamide and N-methyl-2-pyrrolidone). The solvents with strong solvency power for PA greatly swelled and deformed the dense RO PA layer, making the PA network more permeable and looser, which significantly improved the water permeance of the RO membrane while maintaining its high rejection to divalent salts. Consequently, the solvent-activated RO membranes exhibited remarkable NF-grade separation performance, exceeding that of the commercial NF membrane (NF270, Dow Filmtec.). Particularly, the DMSO-activated membrane showed similar to 30% higher water permeance, higher salt rejection and similar to 6.8 times higher monovalent/divalent ion selectivity than NF270. This was attributed to the strongest solvency power of DMSO among the solvents used. Moreover, the solvent-activated membrane exhibited the superior acid stability to NF270 owing to the higher acid resistance of its fully-aromatic PA chemistry than that of the semi-aromatic PA. Our proposed method is a simple, effective and commercially viable strategy for fabricating high-performance and acid-resistant NF membranes that can expand the application spectrum of NF technology.
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