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dc.contributor.authorBanasiak, Laura Joan
dc.contributor.authorSchäfer, Andrea
dc.date.accessioned2010-10-27T15:27:48Z
dc.date.available2010-10-27T15:27:48Z
dc.date.issued2010
dc.identifier.citationJournal of Membrane Science 365 (2010) 198–205en
dc.identifier.urihttp://dx.doi.org/10.1016/j.memsci.2010.09.010
dc.identifier.urihttp://hdl.handle.net/1842/4095
dc.descriptionArticle in Press (Corrected Proof) - first available online 21 September 2010.en
dc.description.abstractThe mechanisms of sorption of four steroidal hormones – estradiol, estrone, progesterone and testosterone – to electrodialysis (ED) membranes were investigated as a function of solution pH and presence of humic acid (HA). Hormone-membrane partition coefficients (log KAEM/CEM) determined through sorption isotherm experiments suggested that hormone sorption was due to hydrogen bonding and cation–π interactions between hormone and membrane functional groups. Progesterone sorption at pH 7 (922 μg/cm3) during ED was greater than estrone sorption (591 μg/cm3) due to its greater cation-exchange membrane (CEM) bonding affinity. Estrone sorption at pH 11 (487 μg/cm3) was reduced due to estrone dissociation and electrostatic repulsion with negatively charged CEMs. Permeation of estrone (30–100 ng/cm2 h) through the anion-exchange membranes (AEMs) was observed. At pH 11, charge repulsion between estrone and HA coupled with AEM electrostatic attraction resulted in increased sorption. Partial membrane desorption was noted in isotherm (20–30%) and ED desorption (3.8%) experiments and was dependent on the initial mass sorbed, solution pH and resultant electrostatic interactions.en
dc.language.isoenen
dc.publisherElsevieren
dc.subjectElectrodialysisen
dc.subjectHormonesen
dc.subjectAdsorptionen
dc.subjectIon-exchange membranesen
dc.subjectOrganic matteren
dc.titleSorption of steroidal hormones by electrodialysis membranesen
dc.typeArticleen


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