Direct quantification of negatively charged functional groups on membrane surfaces

Handle URI:
http://hdl.handle.net/10754/597989
Title:
Direct quantification of negatively charged functional groups on membrane surfaces
Authors:
Tiraferri, Alberto; Elimelech, Menachem
Abstract:
Surface charge plays an important role in membrane-based separations of particulates, macromolecules, and dissolved ionic species. In this study, we present two experimental methods to determine the concentration of negatively charged functional groups at the surface of dense polymeric membranes. Both techniques consist of associating the membrane surface moieties with chemical probes, followed by quantification of the bound probes. Uranyl acetate and toluidine blue O dye, which interact with the membrane functional groups via complexation and electrostatic interaction, respectively, were used as probes. The amount of associated probes was quantified using liquid scintillation counting for uranium atoms and visible light spectroscopy for the toluidine blue dye. The techniques were validated using self-assembled monolayers of alkanethiols with known amounts of charged moieties. The surface density of negatively charged functional groups of hand-cast thin-film composite polyamide membranes, as well as commercial cellulose triacetate and polyamide membranes, was quantified under various conditions. Using both techniques, we measured a negatively charged functional group density of 20-30nm -2 for the hand-cast thin-film composite membranes. The ionization behavior of the membrane functional groups, determined from measurements with toluidine blue at varying pH, was consistent with published data for thin-film composite polyamide membranes. Similarly, the measured charge densities on commercial membranes were in general agreement with previous investigations. The relative simplicity of the two methods makes them a useful tool for quantifying the surface charge concentration of a variety of surfaces, including separation membranes. © 2011 Elsevier B.V.
Citation:
Tiraferri A, Elimelech M (2012) Direct quantification of negatively charged functional groups on membrane surfaces. Journal of Membrane Science 389: 499–508. Available: http://dx.doi.org/10.1016/j.memsci.2011.11.018.
Publisher:
Elsevier BV
Journal:
Journal of Membrane Science
KAUST Grant Number:
KUS-C1-018-02
Issue Date:
Feb-2012
DOI:
10.1016/j.memsci.2011.11.018
Type:
Article
ISSN:
0376-7388
Sponsors:
This publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST); by the NWRI-AMTA Fellowship for membrane technology; and by the WaterCAMPWS, a Science and Technology Center of Advanced Materials for the Purification of Water with Systems under the National Science Foundation Grant CTS-0120978. We thank Eric Hoek at UCLA and Baoxia Mi at the University of Maryland for useful guidance on protocols for interfacial polymerization. We also thank Roni Kasher at Ben-Gurion University, Israel, for discussion and advice on the TBO technique.
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Full metadata record

DC FieldValue Language
dc.contributor.authorTiraferri, Albertoen
dc.contributor.authorElimelech, Menachemen
dc.date.accessioned2016-02-25T13:10:28Zen
dc.date.available2016-02-25T13:10:28Zen
dc.date.issued2012-02en
dc.identifier.citationTiraferri A, Elimelech M (2012) Direct quantification of negatively charged functional groups on membrane surfaces. Journal of Membrane Science 389: 499–508. Available: http://dx.doi.org/10.1016/j.memsci.2011.11.018.en
dc.identifier.issn0376-7388en
dc.identifier.doi10.1016/j.memsci.2011.11.018en
dc.identifier.urihttp://hdl.handle.net/10754/597989en
dc.description.abstractSurface charge plays an important role in membrane-based separations of particulates, macromolecules, and dissolved ionic species. In this study, we present two experimental methods to determine the concentration of negatively charged functional groups at the surface of dense polymeric membranes. Both techniques consist of associating the membrane surface moieties with chemical probes, followed by quantification of the bound probes. Uranyl acetate and toluidine blue O dye, which interact with the membrane functional groups via complexation and electrostatic interaction, respectively, were used as probes. The amount of associated probes was quantified using liquid scintillation counting for uranium atoms and visible light spectroscopy for the toluidine blue dye. The techniques were validated using self-assembled monolayers of alkanethiols with known amounts of charged moieties. The surface density of negatively charged functional groups of hand-cast thin-film composite polyamide membranes, as well as commercial cellulose triacetate and polyamide membranes, was quantified under various conditions. Using both techniques, we measured a negatively charged functional group density of 20-30nm -2 for the hand-cast thin-film composite membranes. The ionization behavior of the membrane functional groups, determined from measurements with toluidine blue at varying pH, was consistent with published data for thin-film composite polyamide membranes. Similarly, the measured charge densities on commercial membranes were in general agreement with previous investigations. The relative simplicity of the two methods makes them a useful tool for quantifying the surface charge concentration of a variety of surfaces, including separation membranes. © 2011 Elsevier B.V.en
dc.description.sponsorshipThis publication is based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST); by the NWRI-AMTA Fellowship for membrane technology; and by the WaterCAMPWS, a Science and Technology Center of Advanced Materials for the Purification of Water with Systems under the National Science Foundation Grant CTS-0120978. We thank Eric Hoek at UCLA and Baoxia Mi at the University of Maryland for useful guidance on protocols for interfacial polymerization. We also thank Roni Kasher at Ben-Gurion University, Israel, for discussion and advice on the TBO technique.en
dc.publisherElsevier BVen
dc.subjectCarboxylic groupsen
dc.subjectCharge densityen
dc.subjectCharge quantificationen
dc.subjectPolyamideen
dc.subjectSurface chargeen
dc.subjectThin-film composite membranesen
dc.subjectTitrationen
dc.subjectToluidine blue Oen
dc.subjectUranylen
dc.subjectUranyl cation bindingen
dc.subjectWater purificationen
dc.titleDirect quantification of negatively charged functional groups on membrane surfacesen
dc.typeArticleen
dc.identifier.journalJournal of Membrane Scienceen
dc.contributor.institutionYale University, New Haven, United Statesen
kaust.grant.numberKUS-C1-018-02en
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