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Simple and effective chitosan based films for the removal of Hg from waters: Equilibrium, kinetic and ionic competition

2016-09Journal article Restricted
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dc.contributor.authorRocha, Luciana S.
dc.contributor.authorAlmeida, Ângela
dc.contributor.authorNunes, Cláudia
dc.contributor.authorHenriques, Bruno
dc.contributor.authorCoimbra, Manuel A.
dc.contributor.authorLopes, Cláudia B.
dc.contributor.authorSilva, Carlos M.
dc.contributor.authorDuarte, Armando C.
dc.contributor.authorPereira, Eduarda
dc.date.accessioned2017-04-07T15:56:01Z
dc.date.available2017-04-07T15:56:01Z
dc.date.issued2016-09
dc.description.abstractThe efficiency of chitosan cross-linked with genipin (Chg) and cross-linked with genipin and grafted with caffeic acid (Ch(g+car)) to remove Hg(II) from waters was investigated. An optimal dose of 50 mg L-1 for both chitosan films was selected based on the equilibrium removal percentage and on the contact time required to attain the equilibrium. The sorption extent was dependent on the initial Hg(II) concentration (C-Hg,C-0), with removal efficiencies varying between 79% and 82% for C-Hg,C-0 = 0.05 mg L-1 and between 89% and 94% for C-Hg,C-0 = 0.50 mg L-1. Under ion competition, the Ch(g) and Ch(g+caf) films showed to be effective and selective for mercury in multimetallic solutions containing also cadmium and lead. In the case of natural river and seawaters, the mercury speciation played an important role in the overall sorption process, reducing the percentage removal of Hg. In terms of modeling, the kinetic data were well described by pseudo-first and pseudo-second order models, depending on the experimental conditions. The diffusion models suggested that the entire sorption process of Hg(II) by both Chg and Chg+caf films was essentially controlled by pore diffusion. The equilibrium data were well described by the Sips isotherm, and the estimated capacity was 2.2 and 4.0 mg g(-1) for Chg and Ch(g+caf) films, respectively. In the whole, the results showed that the sorption efficiency was improved by grafting caffeic acid to the polymeric chains of chitosan cross-linked with genipin. (C) 2016 Elsevier B.V. All rights reserved.
dc.identifier.doihttps://doi.org/10.1016/j.cej.2016.04.054
dc.identifier.issn1385-8947
dc.identifier.urihttp://hdl.handle.net/10400.1/9292
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationMacroalgae-based biotechnologies for the removal of classic and emergent contaminants from waters
dc.relationGraphene-based nanomaterials for multiple environmental applications
dc.relation.isbasedonWOS:000378181400022
dc.subjectMercury
dc.subjectChitosan films
dc.subjectChemical modification
dc.subjectCompetitive ions
dc.subjectRemediation
dc.subjectNatural waters
dc.titleSimple and effective chitosan based films for the removal of Hg from waters: Equilibrium, kinetic and ionic competition
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleMacroalgae-based biotechnologies for the removal of classic and emergent contaminants from waters
oaire.awardTitleGraphene-based nanomaterials for multiple environmental applications
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FAMB%2F50017%2F2013/PT
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oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/SFRH%2FBPD%2F99453%2F2014/PT
oaire.citation.endPage229
oaire.citation.startPage217
oaire.citation.titleChemical Engineering Journal
oaire.citation.volume300
oaire.fundingStream5876
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oaire.fundingStream5876
oaire.fundingStreamSFRH
oaire.fundingStreamSFRH
oaire.fundingStreamOE
person.familyNameRocha
person.givenNameLuciana
person.identifier.ciencia-id9415-9C14-C4CD
person.identifier.orcid0000-0002-5469-0911
person.identifier.ridM-2566-2013
person.identifier.scopus-author-id8041532300
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project.funder.nameFundação para a Ciência e a Tecnologia
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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
project.funder.nameFundação para a Ciência e a Tecnologia
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