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Acid-base treated vermiculite as high performance adsorbent: Insights into the mechanism of cationic dyes adsorption, regeneration, recyclability and stability studies

2017Journal article Open access
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dc.contributor.authorStawiński, Wojciech
dc.contributor.authorWęgrzyn, Agnieszka
dc.contributor.authorDańko, Tomasz
dc.contributor.authorFreitas, Olga
dc.contributor.authorFigueiredo, Sónia
dc.contributor.authorChmielarz, Lucjan
dc.date.accessioned2019-06-06T10:17:49Z
dc.date.available2019-06-06T10:17:49Z
dc.date.issued2017
dc.description.abstractAdditional treatment with NaOH of acid activated vermiculite results in even higher increase in the adsorption capacity in comparison to samples modified only in acidic solution (first step of activation) with respect to raw material. Optimization of treatment conditions and adsorption capacity for two cationic dyes (methylene blue (MB) and astrazon red (AR)), also as binary mixture, was evaluated. The capacity, based on column studies, increased from 48 ± 2 to 203 ± 4 mg g-1 in the case of methylene blue and from 51 ± 1 to 127 ± 2 mg g-1 in the case of astrazon red on starting and acid-base treated material, respectively. It was shown that adsorption mechanism changes for both cationic dyes after NaOH treatment and it results in decrease of adsorption rate. In binary mixtures methylene blue is bound stronger by adsorbent and astrazon red may be removed in initial stage of adsorption. Extensive studies on desorption/regeneration process proved high efficiency in recyclable use of all materials. Although cation exchange capacity decreases due to acid treatment, after base treatment exchange properties are used more efficiently. On the other hand, increased specific surface area has less significant contribution into the adsorption potential of studied materials. Obtained adsorbents worked efficiently in 7 adsorption-regeneration cycles and loss of adsorption capacity was observed only in two first cycles.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.chemosphere.2017.01.039pt_PT
dc.identifier.issn0045-6535
dc.identifier.urihttp://hdl.handle.net/10400.22/13862
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationPOIG.02.01.00-12-023/08pt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0045653517300413?via%3Dihubpt_PT
dc.subjectAcidspt_PT
dc.subjectAdsorptionpt_PT
dc.subjectAlkaliespt_PT
dc.subjectAluminum Silicatespt_PT
dc.subjectCationspt_PT
dc.subjectColoring Agentspt_PT
dc.subjectMethylene Bluept_PT
dc.titleAcid-base treated vermiculite as high performance adsorbent: Insights into the mechanism of cationic dyes adsorption, regeneration, recyclability and stability studiespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F80537%2F2011/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/COMPETE/PEst-C%2FEQB%2FLA0006%2F2013/PT
oaire.citation.endPage115pt_PT
oaire.citation.startPage107pt_PT
oaire.citation.titleChemospherept_PT
oaire.citation.volume173pt_PT
oaire.fundingStreamSFRH
oaire.fundingStreamCOMPETE
person.familyNameFreitas
person.familyNameFigueiredo
person.givenNameOlga
person.givenNameSónia
person.identifier1104854
person.identifier.ciencia-id6915-A6F2-F8A1
person.identifier.orcid0000-0002-2499-6143
person.identifier.orcid0000-0001-8548-2528
person.identifier.ridD-8307-2013
person.identifier.ridD-8292-2013
person.identifier.scopus-author-id18634256400
person.identifier.scopus-author-id7004125737
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
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication0ad2655f-ef25-4db8-a093-693abeaff50b
relation.isAuthorOfPublication692766a7-ed88-44e8-aed6-13d3ff5a07b0
relation.isAuthorOfPublication.latestForDiscovery0ad2655f-ef25-4db8-a093-693abeaff50b
relation.isProjectOfPublication779ddb08-860d-4e33-a0e8-869eaea88c58
relation.isProjectOfPublication81c785e2-6b3f-4488-beb5-943583d0176c
relation.isProjectOfPublication.latestForDiscovery81c785e2-6b3f-4488-beb5-943583d0176c

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