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Kinetic analysis of metal uptake by dry and gel alginate particles

2009Journal article Restricted access
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dc.contributor.authorLagoa, Ricardo
dc.contributor.authorRodrigues, Joaquim Rui
dc.date.accessioned2016-12-23T11:59:49Z
dc.date.available2016-12-23T11:59:49Z
dc.date.issued2009
dc.description.abstractThe kinetics of metal uptake by gel and dry calcium alginate beads was analysed using solutions of copper or lead ions. Gel beads sorbed metal ions faster than the dry ones and larger diffusivities of metal ions were calculated for gel beads: approximately 10−4 cm2/min vs. 10−6 cm2/min for dry beads. In accordance, scanning electron microscopy and nitrogen adsorption data revealed a low porosity of dry alginate particles. However, dry beads showed higher sorption capacities and a mechanical stability more suitable for large-scale use. Two sorption models were fitted to the kinetic results: the Lagergren pseudo-first order and the Ho and McKay pseudo-second order equations. The former was found to be the most adequate to model metal uptake by dry alginate beads and kinetic constants in the orders of 10−3 and 10−2 min−1 were obtained for lead solutions with concentrations up to 100 g/m3. The pseudo-first order model was also found to be valid to describe biosorbent operation with a real wastewater indicating that it can be used to design processes of metal sorption with alginate-based materials.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.bej.2009.06.007pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.8/2342
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S1369703X09002009pt_PT
dc.subjectBiopolymerpt_PT
dc.subjectBiosorptionpt_PT
dc.subjectHeavy metalspt_PT
dc.subjectBiomaterialpt_PT
dc.subjectEffluentpt_PT
dc.subjectWater treatmentpt_PT
dc.subjectResearch Subject Categories::NATURAL SCIENCES::Chemistry::Biochemistrypt_PT
dc.subjectResearch Subject Categories::TECHNOLOGY::Bioengineeringpt_PT
dc.subjectResearch Subject Categories::NATURAL SCIENCES::Chemistry::Environmental chemistry::Environmental toxicologypt_PT
dc.subjectResearch Subject Categories::TECHNOLOGY::Chemical engineeringpt_PT
dc.titleKinetic analysis of metal uptake by dry and gel alginate particlespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage326pt_PT
oaire.citation.issue3pt_PT
oaire.citation.startPage320pt_PT
oaire.citation.titleBiochemical Engineering Journalpt_PT
oaire.citation.volume46pt_PT
person.familyNameLagoa
person.familyNameRodrigues
person.givenNameRicardo
person.givenNameJoaquim Rui
person.identifier124357
person.identifier.ciencia-id5C18-A29A-44AB
person.identifier.ciencia-id9018-0B83-E2C6
person.identifier.orcid0000-0003-2375-6612
person.identifier.orcid0000-0002-9756-1124
person.identifier.ridL-4137-2014
person.identifier.scopus-author-id23051352300
person.identifier.scopus-author-id10242931100
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication8a139213-9a89-4bd3-93ee-1e332519f96b
relation.isAuthorOfPublication52f6ffb2-43e9-4f78-b414-dbac46f80305
relation.isAuthorOfPublication.latestForDiscovery52f6ffb2-43e9-4f78-b414-dbac46f80305

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