Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.memsci.2012.10.014
Title: Highly crosslinked layer-by-layer polyelectrolyte FO membranes: Understanding effects of salt concentration and deposition time on FO performance
Authors: Duong, P.H.H. 
Zuo, J.
Chung, T.-S. 
Keywords: Forward osmosis
Glutaraldehyde (GA) crosslinker
Layer-by-layer
Polyelectrolytes
UV crosslinking
Issue Date: 5-Jan-2013
Citation: Duong, P.H.H., Zuo, J., Chung, T.-S. (2013-01-05). Highly crosslinked layer-by-layer polyelectrolyte FO membranes: Understanding effects of salt concentration and deposition time on FO performance. Journal of Membrane Science 427 : 411-421. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2012.10.014
Abstract: Layer-by-layer (LbL) deposition of polyelectrolytes onto a negative charge membrane has been investigated under a highly crosslinking condition for forward osmosis (FO). The influence of salt concentration and deposition time on LbL FO membranes performance has been investigated in order to optimize the deposition process, followed by the investigation of polyelectrolyte layer's crosslinking. In the crosslinking steps, polycation layers of the three bilayer LbL membrane were firstly crosslinked using glutaraldehyde (GA) as the crosslinker. Compared to a non-crosslinked membrane, the reverse salt fluxes were reduced by 63% and 58% under the PRO (pressure retarded osmosis) testing mode using 0.5M MgCl2 and 0.5M NaCl as draw solutions, respectively. Subsequently, the polyanion layer of that membrane was photo-crosslinked under ultraviolent (UV) at the wavelength of 254nm. The reverse salt flux of the resulting membrane was further reduced by 55% and 53% under the PRO testing mode using 0.5M MgCl2 and 0.5M NaCl as draw solutions, respectively. Specially, the LbL membrane with only one bilayer after cross-linking by both GA and 4h-UV could achieve a water flux of about 11LMH and a reverse flux of 8gMH under the PRO test using 0.3M NaCl as a draw solution. This is the first time, a LbL polyelectrolyte membrane has been successfully demonstrated as a FO membrane with good rejection toward NaCl while none of previously reported LbL polyelectrolyte membranes have achieved based on the best of our knowledge. © 2012 Elsevier B.V.
Source Title: Journal of Membrane Science
URI: http://scholarbank.nus.edu.sg/handle/10635/89095
ISSN: 03767388
DOI: 10.1016/j.memsci.2012.10.014
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