Development of a PDMS-grafted alumina membrane and its evaluation as solvent resistant nanofiltration membrane

Development of a PDMS-grafted alumina membrane and its evaluation as solvent resistant nanofiltration membrane

A new solvent resistant nanofiltration (SRNF) membrane is developed by grafting a PDMS polymer into the pores of a 5nm γ-alumina ceramic membrane. These PDMS-grafted γ-alumina membranes were attained through a two-step synthesis. The linking agent, 3-aminopropyltriethoxysilane (APTES), was first app...

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Bibliographic Details
Published in:Journal of membrane science Vol. 463; pp. 24 - 32
Main Authors: Pinheiro, Ana F.M., Hoogendoorn, Danny, Nijmeijer, Arian, Winnubst, Louis
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 01-08-2014
Elsevier
Subjects:
Ceramics
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Grafting
Hexanes
Membranes
Nanofiltration
PDMS
Porous alumina
Porous materials
Silicone resins
Solvent nanofiltration
Solvents
Toluene
Vapor phase deposition
Porous alumina
Vapor phase deposition
Grafting
Solvent nanofiltration
PDMS
Binary compound
Porous material
Membrane separation
Nanofiltration
Vapor deposition
Vapor phase
Membrane
Alumina
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Summary:A new solvent resistant nanofiltration (SRNF) membrane is developed by grafting a PDMS polymer into the pores of a 5nm γ-alumina ceramic membrane. These PDMS-grafted γ-alumina membranes were attained through a two-step synthesis. The linking agent, 3-aminopropyltriethoxysilane (APTES), was first applied on a ceramic membrane either by a vapor phase or a solution phase method, followed by grafting of an epoxy-terminated PDMS. Through this route it was possible to tune the pore size and to engineer the surface chemistry (e.g. hydrophobicity) of ceramic membranes in favor of non-polar organic solvent permeation. Reproducible results were obtained for filtration experiments with hexane, toluene and isopropanol (IPA). As expected, higher permeabilities were found for non-polar solvents than for more polar solvents (resp. 4.8±0.1lm−2h−1bar−1 for hexane, 3.1±0.5lm−2h−1bar−1 for toluene and 0.54±0.04lm−2h−1bar−1 for IPA). A Molecular Weight Cut Off (MWCO) of 500±10Da was determined. Stability tests in hexane, toluene and IPA have shown that these newly developed membranes were stable in all these solvents during testing periods of up to 170 days. •A method is described to tune the pore size and the surface chemistry of ceramic membranes.•A hydrophobic solvent resistant membrane is developed by grafting a PDMS layer on a ceramic γ-alumina membrane.•Reproducible and long-term stable flux values were obtained for toluene, n-hexane and iso-propyl alcohol.•Nanofiltration with Molecular Weight Cut Off (MWCO) values of 500DA was achieved.
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ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2014.03.050