Method for the preparation of cellulose acetate flat sheet composite membranes for forward osmosis—Desalination using MgSO4 draw solution

Handle URI:
http://hdl.handle.net/10754/598818
Title:
Method for the preparation of cellulose acetate flat sheet composite membranes for forward osmosis—Desalination using MgSO4 draw solution
Authors:
Sairam, M.; Sereewatthanawut, E.; Li, K.; Bismarck, A.; Livingston, A.G.
Abstract:
A lab scale method for the preparation of defect free flat sheet composite membranes for forward osmosis (FO) has been developed. Membranes containing a thin layer of cellulose acetate (CA) cast on a nylon fabric of 50μm thick were prepared by phase inversion in water. Cellulose acetate (CA) membranes with an overall thickness of 70-80μm have been prepared with lactic acid, maleic acid and zinc chloride as pore forming agents, at different annealing temperatures, for forward osmosis. These membranes have been tested in the desalination of saline feeds (35g·L-1 of NaCl) using magnesium sulphate solution (150g·L-1) as the draw solution. The water flux, and rejection of NaCl, were compared with those of commercially available membranes tested under the same FO conditions. The commercially available FO membrane from Hydration Technologies Inc, OR (M1) has a permeability of 0.13L·h-1·m-2·bar-1 with a NaCl rejection of 97% when tested with 150g·L-1 of MgSO4 in the draw solution. Another commercially available membrane for FO from Hydration Technologies Inc, OR, M2 has a water permeability of 0.014L·h-1·m-2·bar-1 with NaCl rejection of 100%. The flux and rejection of the CA membranes prepared in this work are found to be dependent on the nature of the pore forming agent, and annealing temperature. Impregnation of an inorganic filler, sodium montmorrillonite in CA membranes and coating of CA membranes with hydrophilic PVA did not enhance the flux of base CA membranes. Cellulose acetate membranes cast from dope solutions containing acetone/isopropanol and lactic acid, maleic acid and zinc chloride as pore forming agents have water permeabilities of 0.13, 0.09 and 0.68L·h-1·m-2·bar-1 respectively, with NaCl rejections of 97.7, 99.3 and 88% when annealed at 50°C. CA membranes prepared with zinc chloride as a pore forming agent have good permeability of 0.27L·h-1·m-2·bar-1 with a NaCl rejection of 95% when annealed at 70°C. © 2011.
Citation:
Sairam M, Sereewatthanawut E, Li K, Bismarck A, Livingston AG (2011) Method for the preparation of cellulose acetate flat sheet composite membranes for forward osmosis—Desalination using MgSO4 draw solution. Desalination 273: 299–307. Available: http://dx.doi.org/10.1016/j.desal.2011.01.050.
Publisher:
Elsevier BV
Journal:
Desalination
KAUST Grant Number:
CEKAU PS0914
Issue Date:
Jun-2011
DOI:
10.1016/j.desal.2011.01.050
Type:
Article
ISSN:
0011-9164
Sponsors:
The authors wish to acknowledge the financial support CEKAU PS0914 from King Abdullah University for Science and Technology (KAUST), Saudi Arabia under the KAUST-Imperial College Academic Excellency Alliance.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorSairam, M.en
dc.contributor.authorSereewatthanawut, E.en
dc.contributor.authorLi, K.en
dc.contributor.authorBismarck, A.en
dc.contributor.authorLivingston, A.G.en
dc.date.accessioned2016-02-25T13:41:50Zen
dc.date.available2016-02-25T13:41:50Zen
dc.date.issued2011-06en
dc.identifier.citationSairam M, Sereewatthanawut E, Li K, Bismarck A, Livingston AG (2011) Method for the preparation of cellulose acetate flat sheet composite membranes for forward osmosis—Desalination using MgSO4 draw solution. Desalination 273: 299–307. Available: http://dx.doi.org/10.1016/j.desal.2011.01.050.en
dc.identifier.issn0011-9164en
dc.identifier.doi10.1016/j.desal.2011.01.050en
dc.identifier.urihttp://hdl.handle.net/10754/598818en
dc.description.abstractA lab scale method for the preparation of defect free flat sheet composite membranes for forward osmosis (FO) has been developed. Membranes containing a thin layer of cellulose acetate (CA) cast on a nylon fabric of 50μm thick were prepared by phase inversion in water. Cellulose acetate (CA) membranes with an overall thickness of 70-80μm have been prepared with lactic acid, maleic acid and zinc chloride as pore forming agents, at different annealing temperatures, for forward osmosis. These membranes have been tested in the desalination of saline feeds (35g·L-1 of NaCl) using magnesium sulphate solution (150g·L-1) as the draw solution. The water flux, and rejection of NaCl, were compared with those of commercially available membranes tested under the same FO conditions. The commercially available FO membrane from Hydration Technologies Inc, OR (M1) has a permeability of 0.13L·h-1·m-2·bar-1 with a NaCl rejection of 97% when tested with 150g·L-1 of MgSO4 in the draw solution. Another commercially available membrane for FO from Hydration Technologies Inc, OR, M2 has a water permeability of 0.014L·h-1·m-2·bar-1 with NaCl rejection of 100%. The flux and rejection of the CA membranes prepared in this work are found to be dependent on the nature of the pore forming agent, and annealing temperature. Impregnation of an inorganic filler, sodium montmorrillonite in CA membranes and coating of CA membranes with hydrophilic PVA did not enhance the flux of base CA membranes. Cellulose acetate membranes cast from dope solutions containing acetone/isopropanol and lactic acid, maleic acid and zinc chloride as pore forming agents have water permeabilities of 0.13, 0.09 and 0.68L·h-1·m-2·bar-1 respectively, with NaCl rejections of 97.7, 99.3 and 88% when annealed at 50°C. CA membranes prepared with zinc chloride as a pore forming agent have good permeability of 0.27L·h-1·m-2·bar-1 with a NaCl rejection of 95% when annealed at 70°C. © 2011.en
dc.description.sponsorshipThe authors wish to acknowledge the financial support CEKAU PS0914 from King Abdullah University for Science and Technology (KAUST), Saudi Arabia under the KAUST-Imperial College Academic Excellency Alliance.en
dc.publisherElsevier BVen
dc.subjectDesalinationen
dc.subjectForward osmosisen
dc.subjectMagnesium sulphateen
dc.subjectMembraneen
dc.titleMethod for the preparation of cellulose acetate flat sheet composite membranes for forward osmosis—Desalination using MgSO4 draw solutionen
dc.typeArticleen
dc.identifier.journalDesalinationen
dc.contributor.institutionImperial College London, London, United Kingdomen
kaust.grant.numberCEKAU PS0914en
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