Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.memsci.2005.12.019
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dc.titlePreparing highly porous chitosan/cellulose acetate blend hollow fibers as adsorptive membranes: Effect of polymer concentrations and coagulant compositions
dc.contributor.authorLiu, C.
dc.contributor.authorBai, R.
dc.date.accessioned2014-10-08T08:33:24Z
dc.date.available2014-10-08T08:33:24Z
dc.date.issued2006-08-01
dc.identifier.citationLiu, C., Bai, R. (2006-08-01). Preparing highly porous chitosan/cellulose acetate blend hollow fibers as adsorptive membranes: Effect of polymer concentrations and coagulant compositions. Journal of Membrane Science 279 (1-2) : 336-346. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2005.12.019
dc.identifier.issn03767388
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/87600
dc.description.abstractIn this work, we report the study on the effect of fabrication factors influencing the structures and morphologies of the chitosan and cellulose acetate blend hollow fibers as adsorptive membranes to achieve highly porous and macrovoids-free structures with different pore sizes. The factors investigated include chitosan (CS) and cellulose acetate (CA) concentrations in the spinning dope solutions, and the composition of the external and internal coagulants. For CA concentration at 12-18 wt% and CS concentration at up to 4 wt% in the spinning dope solutions, the blend hollow fibers were successfully prepared with outer surface pore sizes, specific surface areas and porosities in the range of 0.54-0.049 μm, 10.4-14.5 m2/g and 80.6-70.4%, respectively, depending on the CA and CS amounts in the spinning dope solutions and the coagulants used. Water, a weaker coagulant, can be used as both the external and internal coagulants in the fabrication process and the resultant CS/CA blend hollow fibers showed spongy-like, macrovoids-free and relatively uniform porous structures which are desirable for adsorptive membranes. By increasing the alkalinity of the coagulants, the coagulation rate of the blend hollow fibers was increased and the hollow fibers were observed to form relatively denser surface layers and to have smaller surface pore sizes and slightly greater specific surface areas, due to the stronger coagulation effect. Particularly, when NaOH solutions (1-3 wt%) were examined as the internal coagulant, more and larger macrovoids were formed in the blend hollow fibers at the near lumen side with the increase of the NaOH concentrations at low CS concentrations (
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.memsci.2005.12.019
dc.sourceScopus
dc.subjectBlend hollow fiber
dc.subjectCellulose acetate
dc.subjectChitosan
dc.subjectFabrication factors
dc.subjectMorphologies
dc.subjectPorous structures
dc.typeArticle
dc.contributor.departmentDIVISION OF ENVIRONMENTAL SCIENCE & ENGG
dc.description.doi10.1016/j.memsci.2005.12.019
dc.description.sourcetitleJournal of Membrane Science
dc.description.volume279
dc.description.issue1-2
dc.description.page336-346
dc.description.codenJMESD
dc.identifier.isiut000238505900034
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