Journal
AICHE JOURNAL
Volume 67, Issue 6, Pages -Publisher
WILEY
DOI: 10.1002/aic.17173
Keywords
crown ether; interfacial polymerization; permeability-selectivity trade-off; polyamide; thin-film composite membrane
Categories
Funding
- National Key Technology Support Program [2014BAD12B06]
- National Natural Science Foundation of China [21878117, 21306058]
- Natural Science Foundation of Hubei Scientific Committee [2016CFA001]
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In this study, multifunctional crown ethers were successfully incorporated into thin-film composite polyamide membranes using a modified interfacial polymerization process. This modification resulted in increased water flux, reduced reverse salt flux, improved antifouling behavior, and enhanced chemical stability in harsh conditions compared to traditional TFC membranes.
In this study, we deployed a modified interfacial polymerization process to incorporate multifunctional crown ethers (CEs) into thin-film composite (TFC) polyamide membranes. CE additives acted as both the phase-transfer catalyst and co-solvent to facilitate the diffusion of amine monomers into the organic phase via interacting with amine monomers (form the host-guest inclusion complex), and enhanced the free volume content of the selective layer, therefore facilitating water transport and inhibiting the diffusion of salt ions. Various characterization techniques were employed to elucidate the modification mechanism as a function of CE chemical and physical properties on the microstructure of resultant TFC membranes and consequently separation performances. Compared to TFC membranes produced from traditional interfacial polymerization method, CE-modified membranes exhibited a 146% water flux enhancement and 59% lower reverse salt fluxes with a suitable draw solution. CE-modified membranes also showed the improved antifouling behavior and chemical stability in various harsh conditions.
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