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Crosslinked nanocomposite sodium alginate-based membranes with titanium dioxide for the dehydration of isopropanol by pervaporation

2020Journal article Open access
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dc.contributor.authorPremakshi, P. G.
dc.contributor.authorKariduraganavar, Mahadevappa Y.
dc.contributor.authorMitchell, Geoffrey
dc.date.accessioned2023-04-17T14:30:13Z
dc.date.available2023-04-17T14:30:13Z
dc.date.issued2020
dc.descriptionThe work of H.G. Premakshi and M.Y. Kariduraganavar was supported by the Department of Science & Technology, New Delhi, through the DST-PURSE-Phase-II program (Grant No. SR/PURSE PHASE-2/13 (G)). The work of GRM is supported by the Fundação para a Ciência e a Tecnologia (FCT) and Centro2020 through the project references: UID/Multi/04044/2019; PAMI-ROTEIRO/0328/2013 (No. 022158).pt_PT
dc.description.abstractSodium alginate (NaAlg) based membranes were prepared using a solution technique, crosslinked with poly(styrene sulfonic acid-co-maleic acid) (PSSA-co-MA). Subsequently, the membranes were modified by the incorporation of 0, 10, 20, 30 and 40% w/w of titanium dioxide with respect to sodium alginate. The membranes thus obtained were designated as M, M-1, M-2, M-3 and M-4, respectively. An equilibrium swelling experiment was performed using dfferent compositions of the water and isopropanol mixtures. Subsequently, we used a pervaporation cell fitted with each membrane in order to evaluate the extent of the pervaporation dehydration of isopropanol. Among the membranes studied, the membranes containing 40 mass% of titanium dioxide exhibited the highest separation factor() of 24,092, with a flux(J) of 18.61x10-² kg/m².h at 30ºC for 10 mass%w/w of water in the feed. The total flux and the flux of water were found to overlap with each other, indicating that these membranes can be e ectively used to break the azeotropic point of water–isopropanol mixtures. The results clearly indicate that these nanocomposite membranes exhibit an excellent performance in the dehydration of isopropanol. The activation energy values obtained for the water permeation were significantly lower than those of the isopropanol permeation, underlining that these membranes have a high separation ability for the water isopropanol system. The estimated activation energies for total permeation (EP) and total di usion (ED) values ranged between 10.60 kJ.mol-¹ and 3.96 kJ.mol­-¹, and 10.76 kJ.mol-¹ and 4.29 kJ.mol-¹, respectively. The negative change in the enthalpy values for all the membranes indicates that sorption was mainly dominated by Langmuir’s mode of sorption.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationPremakshi, H. G., Kariduraganavar, M. Y., & Mitchell, G. R. (2020). Crosslinked nanocomposite sodium alginate-based membranes with titanium dioxide for the dehydration of isopropanol by pervaporation. Molecules, 25(6). https://doi.org/10.3390/molecules25061298pt_PT
dc.identifier.doidoi.org/10.3390/molecules25061298pt_PT
dc.identifier.issn1420-3049
dc.identifier.urihttp://hdl.handle.net/10400.8/8398
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPIpt_PT
dc.relationCentre for Rapid and Sustainable Product Development
dc.relation.publisherversionhttps://www.mdpi.com/1420-3049/25/6/1298pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectIsopropanolpt_PT
dc.subjectPervaporationpt_PT
dc.subjectPoly(styrene sulfonic acid-co-maleic acid)pt_PT
dc.subjectSodium alginatept_PT
dc.subjectTitanium dioxidept_PT
dc.titleCrosslinked nanocomposite sodium alginate-based membranes with titanium dioxide for the dehydration of isopropanol by pervaporationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre for Rapid and Sustainable Product Development
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FMulti%2F04044%2F2019/PT
oaire.citation.issue6pt_PT
oaire.citation.titleMoleculespt_PT
oaire.citation.volume25pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameMitchell
person.givenNameGeoffrey
person.identifier166356
person.identifier.ciencia-idE41A-ABDD-1FC7
person.identifier.orcid0000-0001-7977-7610
person.identifier.scopus-author-id7403103397
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication48c8066b-023e-4405-b462-49d28af000d1
relation.isAuthorOfPublication.latestForDiscovery48c8066b-023e-4405-b462-49d28af000d1
relation.isProjectOfPublicationaba3abaa-39ca-424c-a7d7-4d06649c5236
relation.isProjectOfPublication.latestForDiscoveryaba3abaa-39ca-424c-a7d7-4d06649c5236

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