Please use this identifier to cite or link to this item:
|Title:||Novel polyamide-imide/cellulose acetate dual-layer hollow fiber membranes for nanofiltration||Authors:||Sun, S.P.
|Keywords:||Cellulose acetate (CA)
Dual-layer hollow fiber membranes
Torlon® polyamide-imide (PAI)
|Issue Date:||Nov-2010||Citation:||Sun, S.P., Wang, K.Y., Peng, N., Hatton, T.A., Chung, T.-S. (2010-11). Novel polyamide-imide/cellulose acetate dual-layer hollow fiber membranes for nanofiltration. Journal of Membrane Science 363 (1-2) : 232-242. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2010.07.038||Abstract:||A novel dual-layer nanofiltration (NF) hollow fiber membrane was fabricated by the simultaneous co-extrusion of Torlon® polyamide-imide and cellulose acetate dopes through a triple-orifice spinneret in a dry-jet wet phase inversion process. For the first time, the nanopores of dual-layer hollow fiber membranes were molecularly designed by controlling the phase inversion process with the aid of various non-solvent additives into the polymer solutions. Compared to ethanol and 2-propanol, the addition of methanol into the dope led to a significantly decreased pore size but dramatically increased pure water permeability. The improved NF performance may be attributed to (1) a controllable thin selective outer layer; (2) a less resistant interface between the outer and inner layers; and (3) a fully porous substructure with reduced transport resistance. In addition to non-solvent additives, spinneret temperature also plays an important role in designing dual-layer hollow fiber membranes with desirable NF performance. When the spinneret temperature was increased from 25°C to 50°C, the mean effective pore radius and the pure water permeability were simultaneously decreased, which was due to the formation of a denser surface skin and a more compact interface between the two layers. In addition to exhibiting a higher rejection of divalent anions than monovalent anions, and a lower rejection of divalent cations at pH 7.0, the newly developed NF dual-layer hollow fiber membranes with methanol as additive has a relatively high pure water permeability of 11.93lm-2bar-1h-1 with a mean effective pore radius of 0.63nm. These concepts hold great potential for the design of tailor-made NF membranes for various industrial applications. © 2010 Elsevier B.V.||Source Title:||Journal of Membrane Science||URI:||http://scholarbank.nus.edu.sg/handle/10635/89612||ISSN:||03767388||DOI:||10.1016/j.memsci.2010.07.038|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Feb 18, 2020
WEB OF SCIENCETM
checked on Feb 10, 2020
checked on Feb 16, 2020
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.