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dc.contributor.authorSchäfer, Andrea
dc.contributor.authorAkanyeti, Ime
dc.contributor.authorSemião, Andrea J.C.
dc.date.accessioned2011-01-19T16:14:59Z
dc.date.available2011-01-19T16:14:59Z
dc.date.issued2011
dc.identifier.citationSchäfer, A.I. ; Semião, A. ; Akanyeti, I. (2011) Micropollutant sorption to membrane polymers, Advances in Colloid and Interface Science, ‘Membrane Separation and Colloid Science’ invited special issue paper (accepted 09/2010). doi:10.1016/j.cis.2010.09.006en
dc.identifier.urihttp://dx.doi.org/10.1016/j.cis.2010.09.006
dc.identifier.urihttp://hdl.handle.net/1842/4669
dc.description.abstractOrganic micropollutants such as estrogens occur in water in increasing quantities from predominantly anthropogenic sources. In water such micropollutants partition to surfaces such as membrane polymers but also any other natural or treatment related surfaces. Such interactions are often observed as sorption in treatment processes and this phenomenon is exploited in activated carbon filtration, for example. Sorption is important for polymeric materials and this is used for the concentration of such micropollutants for analytical purposes in solid phase extraction. In membrane filtration the mechanism of micropollutant sorption is a relative new discovery that was facilitated through new analytical techniques. This sorption plays an important role in micropollutant retention by membranes although mechanisms of interaction are to date not understood. This review is focused on sorption of estrogens on polymeric surfaces, specifically membrane polymers. Such sorption has been observed to a large extent with values of up to 1.2 ng/cm2 measured. Sorption is dependent on the type of polymer, micropollutant characteristics, solution chemistry, membrane operating conditions as well as membrane morphology. Likely contributors to sorption are the surface roughness as well as the microporosity of such polymers. While retention – or and reflection coefficient as well as solute to effective pore size ratio – control the access of such micropollutants to the inner surface, pore size, porosity and thickness as well as morphology or shape of inner voids determines the available area for sorption. The interaction mechanisms are governed, most likely, by hydrophobic as well as solvation effects and interplay of molecular and supramolecular interactions such as hydrogen bonding, π-cation/anion interactions, π-π stacking, ion-dipole and dipole-dipole interactions, the extent of which is naturally dependent on micropollutant and polymer characteristics. Systematic investigations are required to identify and quantify both relative contributions and strength of such interactions and develop suitable surface characterisation tools. This is a difficult endeavour given the complexity of systems, the possibility of several interactions taking place simultaneously and the generally weaker forces involved.en
dc.language.isoenen
dc.publisherElsevieren
dc.subjectSorptionen
dc.subjectmicropollutanten
dc.subjectmembrane polymeren
dc.subjecthydrogen bondingen
dc.subjectsupramolecular interactionsen
dc.subjectnanofiltrationen
dc.titleMicropollutant Sorption to Membrane Polymers: A Review of Mechanisms for Estrogensen
dc.typeArticleen


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