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Using nanocomposite materials technology to understand and control reverse osmosis membrane compaction

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dc.contributor.authorPendergast, M.T.M.
dc.contributor.authorNygaard, J.M.
dc.contributor.authorGhosh, A.K.
dc.contributor.authorHoek, E.M.V.
dc.date.accessioned2012-10-10T14:15:18Z
dc.date.available2012-10-10T14:15:18Z
dc.date.issued2010-07-02
dc.description.abstractComposite reverse osmosis (RO) membranes were formed by interfacial polymerization of polyamide thin films over pure polysulfone and nanocomposite-polysulfone support membranes. Nanocomposite support membranes were formed from amorphous non-porous silica and crystalline microporous zeolite nanoparticles. For each hand-cast membrane, water flux and NaCl rejection were monitored over time at two different applied pressures. Nanocomposite-polysulfone supported RO membranes generally had higher initial permeability and experienced less flux decline due to compaction than pure polysulfone supported membranes. In addition, observed salt rejection tended to increase as flux declined from compaction. Cross-sectional SEM images verified significant reduction in thickness of pure polysulfone supports, whereas nanocomposites better resisted compaction due to enhanced mechanical stability imparted by the nanoparticles. A conceptual model was proposed to explain the mechanistic relationship between support membrane compaction and observed changes in water flux and salt rejection. As the support membrane compacts, skin layer pore constriction increased the effective path length for diffusion through the composite membranes, which reduced both water and salt permeability identically. However, experimental salt permeability tended to decline to a greater extent than water permeability; hence, the observed changes in flux and rejection might also be related to structural changes in the polyamide thin film. (c) 2010 Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipThis publication is based on the work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST), in addition to the UCLA California NanoSystems Institute (CNSI) and NanoH<INF>2</INF>O Inc. Additional financial support for MTMP was provided by the UCLA Cota Robles Fellowship and the UCLA Faculty Women's Club Russell and Sallie O'Neill Memorial Scholarship, and for JMN by the Environmental Engineers for the Future funding program.en_US
dc.identifier.citationDesalination 261 (2010) 255–263en_US
dc.identifier.issn0011-9164
dc.identifier.otherhttp://dx.doi.org/10.1016/j.desal.2010.06.008
dc.identifier.urihttps://hdl.handle.net/1813/30456
dc.language.isoen_USen_US
dc.publisherElsevieren_US
dc.relation.hasversionhttp://dx.doi.org/10.1016/j.desal.2010.06.008en_US
dc.subjectReverse osmosisen_US
dc.subjectDesalinationen_US
dc.subjectCompactionen_US
dc.subjectInterfacial polymerizationen_US
dc.subjectPhase inversionen_US
dc.subjectNanocompositeen_US
dc.titleUsing nanocomposite materials technology to understand and control reverse osmosis membrane compactionen_US
dc.typearticleen_US

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