Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.memsci.2010.08.034
Title: Effects of annealing on the microstructure and performance of cellulose acetate membranes for pressure-retarded osmosis processes
Authors: Su, J. 
Zhang, S.
Chen, H. 
Chen, H.
Jean, Y.C.
Chung, T.-S. 
Keywords: Annealing
Cellulose acetate
Free volume
Pressure-retarded osmosis
Water flux
Issue Date: 15-Nov-2010
Citation: Su, J., Zhang, S., Chen, H., Chen, H., Jean, Y.C., Chung, T.-S. (2010-11-15). Effects of annealing on the microstructure and performance of cellulose acetate membranes for pressure-retarded osmosis processes. Journal of Membrane Science 364 (1-2) : 344-353. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2010.08.034
Abstract: The effects of annealing on the microstructure and performance of cellulose acetate (CA) forward osmosis (FO) hollow fiber membranes have been studied. The mean pore radius decreases from 0.63nm to 0.39, 0.36, 0.30 and 0.30 upon annealing at 70, 80, 85 and 90°C, respectively. The density of free volume in the depth range of 0.31-1.33μm significantly decreases with depth with annealing at 80°C. Annealing causes the shrinkage of both the voids between nodule aggregates and the spaces between intra-molecular chain segments. At depths greater than 0.31μm, the amount of large cavities increases for all the membranes and its increase are greater for the membranes annealed at 85 and 90°C. The free volume radius and total free volume at a depth of 0.1μm increase with increasing annealing temperature. The amount of free volume at 0.1μm depth slightly decreases upon annealing at 70 and 80°C but increases upon annealing at higher temperatures. In the pressure-retarded osmosis (PRO) process, the CA membrane annealed at 80°C exhibits the highest water flux of 30.98Lm-2h-1 (LMH) with a salt leakage of 0.37gm-2h-1 (gMH) using 2.0M MgCl2 as the draw solution. © 2010 Elsevier B.V.
Source Title: Journal of Membrane Science
URI: http://scholarbank.nus.edu.sg/handle/10635/88804
ISSN: 03767388
DOI: 10.1016/j.memsci.2010.08.034
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