Jump to main content
Jump to site search


Multifunctional amine enables formation of polyamide nanofilm composite ultrafiltration and nanofiltration membranes with modulated charge and performance

Abstract

Conventional thin film composite (TFC) nanofiltration (NF) membranes are positively or negatively charged with an active layer thickness of several nanometers depending on the preparation conditions. Low molecular weight cutoff (MWCO) ultrafiltration (UF) membranes obtained by the phase inversion process show low permeate flux due to the formation of several micrometre thick skin layer. We have developed an extremely simple rout to produce novel TFC NF (MWCO~180 Da) and UF (MWCO~1 and 10 kDa) types of membranes with an active layer thickness in the range of 12-36 nm via the supported interfacial polymerization using polyethyleneimine (PEI) as a monomer. Membrane charge, solute rejection, active layer thickness, and MWCO have been modulated by the simple adjustment of diffusion of PEI towards interfacial zone. TFC UF type of membranes were formed at PEI concentration in the range of 0.01-0.03% w/v while NF membranes were formed at PEI concentration range of 0.05-0.3% w/v. Our TFC NF membranes exhibited permeate water flux of 19-24 Lm-2h-1bar-1 which is about 4-5 times higher than PEI-based membranes, and 1.3-4 times higher than few commercial NF membranes of similar MWCO. The TFC UF membranes showed a permeate flux of ca. 48-69 Lm-2h-1bar-1, about 2-5 times higher than some UF membranes reported here. The process is scalable, and the membranes are useful for the separation of charge and neutral solutes with high efficiency.

Back to tab navigation

Supplementary files

Publication details

The article was received on 13 Aug 2018, accepted on 14 Sep 2018 and first published on 14 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA07841F
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
  •   Request permissions

    Multifunctional amine enables formation of polyamide nanofilm composite ultrafiltration and nanofiltration membranes with modulated charge and performance

    J. S. Trivedi, D. V. Bhalani, G. R. Bhadu and S. K. Jewrajka, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA07841F

Search articles by author

Spotlight

Advertisements