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The ultrafiltration performance of cellulose acetate asymmetric membranes: a new perspective on the correlation with the infrared spectra

2019-09-28Journal article Open access
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dc.contributor.authorFigueiredo, Ana Sofia
dc.contributor.authorGarcia, Ana Rosa
dc.contributor.authorMinhalma, Miguel
dc.contributor.authorILHARCO, LAURA
dc.contributor.authorPinho, Maria de
dc.date.accessioned2019-11-20T11:02:20Z
dc.date.available2019-11-20T11:02:20Z
dc.date.issued2019-09-28
dc.description.abstractIntegral asymmetric cellulose acetate (CA) membranes were casted by phase-inversion with formamide varying content - 22, 30 and 34% - as pore promoter. These membranes, CA-22, CA-30 and CA-34, were analyzed by infrared spectroscopy in attenuated total reflection mode (ATR-FTIR) to investigate the porous membrane matrix influence on the polymer/water/solute interactions and the selective ultrafiltration of salts. The membranes covered a wide range of hydraulic permeabilities, from 3.5 to 81.0 kg.m-2.h-1.bar-1, and of molecular weight cut-offs, from 4.17 to 31.43 kDa. The experimental apparent rejection coefficients of neutral solutes of increasing molecular weight are related to their intrinsic rejection coefficients through the film model. The surface average pore radius, estimated by an iterative algorithm, ranges from 2.1 to 4.5 nm. The tighter membrane, CA-22, displays experimental apparent rejection coefficients to the Na2SO4, CaSO4, MgSO4 of 50% or higher values and this is in contrast with the lower values, between 14 and 18%, to the NaCl, CaCl2 and MgCl2 salts. The ATR-FTIR evidences that in the membranes with larger pores, CA-30 and CA-34, the water molecules are organized with a liquid-water-like structure, in which most molecules are hydrogen bonded to four or to two others; nevertheless, a fraction of water molecules is strongly bonded to the CA carbonyl groups. For the CA-22 membrane, there are more free carbonyl groups and a larger fraction of free water, both able to interact with solutes, such as the hydrated sulphate ions. Therefore, this ultrafiltration membrane has the capability of differentiating anionic species.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationFIGUEIREDO, Ana Sofia; [et al] – The ultrafiltration performance of cellulose acetate asymmetric membranes: a new perspective on the correlation with the infrared spectra. Journal of Membrane Science and Research. ISSN 2476-5406. (2019), pp. 1-11pt_PT
dc.identifier.doi10.22079/JMSR.2019.110424.1269pt_PT
dc.identifier.issn2476-5406
dc.identifier.urihttp://hdl.handle.net/10400.21/10718
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMembrane Processes Research Laboratorypt_PT
dc.relation.publisherversionhttp://www.msrjournal.com/article_36644_2a3c0e260b628af8d5691cb423e024b8.pdfpt_PT
dc.subjectUltrafiltrationpt_PT
dc.subjectCellulose acetatept_PT
dc.subjectSalts rejectionpt_PT
dc.subjectATR-FTIRpt_PT
dc.subjectWater structurespt_PT
dc.titleThe ultrafiltration performance of cellulose acetate asymmetric membranes: a new perspective on the correlation with the infrared spectrapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FCTM%2F04540%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FNAN%2F50024%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTM-BIO%2F6178%2F2014/PT
oaire.citation.endPage11pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleJournal of Membrane Science and Researchpt_PT
oaire.fundingStream5876
oaire.fundingStream5876
oaire.fundingStream3599-PPCDT
person.familyNameFigueiredo
person.familyNameMinhalma
person.familyNameILHARCO
person.givenNameAna Sofia
person.givenNameMiguel
person.givenNameLAURA
person.identifier1326571
person.identifier2161276
person.identifier.ciencia-id3B14-6C9E-8173
person.identifier.ciencia-id5C1D-13E2-201B
person.identifier.orcid0000-0002-9271-8444
person.identifier.orcid0000-0002-6770-194X
person.identifier.orcid0000-0001-6994-1464
person.identifier.ridB-4010-2012
person.identifier.ridC-3304-2008
person.identifier.ridI-8040-2015
person.identifier.scopus-author-id56533256600
person.identifier.scopus-author-id6506304514
person.identifier.scopus-author-id7004567229
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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