Adsorption of estrone in microfiltration membrane filters

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dc.contributor.author Han, Jie en
dc.contributor.author Qiu, W en
dc.contributor.author Gao, Wei en
dc.date.accessioned 2012-05-27T08:27:33Z en
dc.date.issued 2010-12 en
dc.identifier.citation Biochemical Engineering Journal 165(3):819-826 2010 en
dc.identifier.issn 1385-8947 en
dc.identifier.uri http://hdl.handle.net/2292/18569 en
dc.description.abstract Adsorption of estrone was identified in microfiltration membrane filters with 0.1-0.45 mu m nominal pore sizes. This phenomenon is of concern as it may lead to distortion when such filters are used to process estrone solutions prior to chromatography analysis, such as in slurry-type photocataltytic degradation studies. The adsorption of estrone was comparatively assessed in a variety of membrane filters, and considerable adsorption was observed in nylon (NYL), polypropylene (PP), polytetrafluoroethylene (PTFE) and cellulose acetate (CA) filters. While estrone adsorption gradually approached equilibrium in most filters, it maintained at near 100% in NYL filters during most of the filtration process and remained substantial (42.2%) when the filter capacity was reached. This rather unusual phenomenon was investigated, and ascribed to the hydrogen bonding between estrone and NYL membranes as demonstrated by Fourier transform infrared spectroscopy. Further studies showed that estrone adsorption in NYL membranes could be substantially reduced by increasing the pH to facilitate the deprotonation of estrone molecules. Similar improvements were obtained in PP and PTFE filters by pre-dosing estrone solutions with anhydrous ethanol (1:1, vol:vol). The only filter that showed consistently low estrone adsorption (<2.3%) was the 0.45-mu m glass microfibre (GMF) filter. GMF and PTFE filters were further selected to process estrone solutions in a slurry-type photocatalytic degradation system using P25 (R) TiO2 photocatalysts. Both types of filters showed satisfactory performance in terms of estrone solute recovery, as verified by samples simultaneously processed by high-speed centrifuging. It is suggested that caution should be taken when using MF membrane filters to process estrone aqueous solutions. Although GMF and PTFE filters (with solvent pre-dosing) may be appropriate to use, verifications on solute recovery are highly recommended. (C) 2010 Elsevier B.V. All rights reserved. en
dc.publisher Elsevier B.V. en
dc.relation.ispartofseries Chemical Engineering Journal en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/1385-8947/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Estrone Photocatalytic degradation Adsorption Microfiltration Membrane endocrine disrupting chemicals waste-water 17-beta-estradiol estrogens removal sewage degradation solubility polyamide en
dc.title Adsorption of estrone in microfiltration membrane filters en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.cej.2010.10.024 en
pubs.issue 3 en
pubs.begin-page 819 en
pubs.volume 165 en
dc.rights.holder Copyright: Elsevier B.V. en
pubs.end-page 826 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 207963 en
pubs.org-id Engineering en
pubs.org-id Chemical and Materials Eng en
pubs.record-created-at-source-date 2012-05-16 en


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