Biosorption of hexavalent chromium based on modified Y zeolites obtained by alkali-treatment

Detalhes bibliográficos
Autor(a) principal: Figueiredo, Hugo
Data de Publicação: 2010
Outros Autores: Silva, Bruna Andreia Nogueira Airosa, Quintelas, C., Pereira, M. F. R., Neves, Isabel C., Tavares, M. T.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/25951
Resumo: The structural modification of external surface of NaY was investigated in order to enhance efficient biosorption systems consisting of a bacterial biofilm, Arthrobacter viscosus, supported on that zeolite, for removing hexavalent chromium from aqueous solutions. The supported bacterial biofilm reduces Cr(VI) to Cr(III) and this cation is then retained in the zeolite by ion exchange. NaY zeolite was modified by alkali-treatments using NaOH 2.0 M, with two different contact periods of time between the zeolite and the alkaline solutions, resulting in NaYA and in NaYB. The biosorbents supported on the modified NaY zeolite were tested in solutions with low concentration of chromium. The results showed that the modification of external surface of NaY zeolite allows an efficient Cr removal, and the maximum removal efficiency was observed for NaYA sample that was submitted to a smoother chemical treatment.
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spelling Biosorption of hexavalent chromium based on modified Y zeolites obtained by alkali-treatmentAlkali-treatmentArthrobacter viscosusBiosorbentCr(VI)NaY ZeoliteScience & TechnologyThe structural modification of external surface of NaY was investigated in order to enhance efficient biosorption systems consisting of a bacterial biofilm, Arthrobacter viscosus, supported on that zeolite, for removing hexavalent chromium from aqueous solutions. The supported bacterial biofilm reduces Cr(VI) to Cr(III) and this cation is then retained in the zeolite by ion exchange. NaY zeolite was modified by alkali-treatments using NaOH 2.0 M, with two different contact periods of time between the zeolite and the alkaline solutions, resulting in NaYA and in NaYB. The biosorbents supported on the modified NaY zeolite were tested in solutions with low concentration of chromium. The results showed that the modification of external surface of NaY zeolite allows an efficient Cr removal, and the maximum removal efficiency was observed for NaYA sample that was submitted to a smoother chemical treatment.The authors acknowledge to Dr. A.S. Azevedo for collecting the powder diffraction data and Dr. C Ribeiro, from Departamento de Ciencias da Terra of Universidade do Minho, for chemical analyses. This work was supported by Fundacao para a Ciencia e Tecnologia (FCT-Portugal), under program POCTI-SFA-3-686. H.F. and B.S. gratefully acknowledge FCT-Portugal for the PhD grants.Institutul Politehnic din IasiUniversidade do MinhoFigueiredo, HugoSilva, Bruna Andreia Nogueira AirosaQuintelas, C.Pereira, M. F. R.Neves, Isabel C.Tavares, M. T.20102010-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/25951eng1582-9596info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:39:28Zoai:repositorium.sdum.uminho.pt:1822/25951Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:36:04.989759Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Biosorption of hexavalent chromium based on modified Y zeolites obtained by alkali-treatment
title Biosorption of hexavalent chromium based on modified Y zeolites obtained by alkali-treatment
spellingShingle Biosorption of hexavalent chromium based on modified Y zeolites obtained by alkali-treatment
Figueiredo, Hugo
Alkali-treatment
Arthrobacter viscosus
Biosorbent
Cr(VI)
NaY Zeolite
Science & Technology
title_short Biosorption of hexavalent chromium based on modified Y zeolites obtained by alkali-treatment
title_full Biosorption of hexavalent chromium based on modified Y zeolites obtained by alkali-treatment
title_fullStr Biosorption of hexavalent chromium based on modified Y zeolites obtained by alkali-treatment
title_full_unstemmed Biosorption of hexavalent chromium based on modified Y zeolites obtained by alkali-treatment
title_sort Biosorption of hexavalent chromium based on modified Y zeolites obtained by alkali-treatment
author Figueiredo, Hugo
author_facet Figueiredo, Hugo
Silva, Bruna Andreia Nogueira Airosa
Quintelas, C.
Pereira, M. F. R.
Neves, Isabel C.
Tavares, M. T.
author_role author
author2 Silva, Bruna Andreia Nogueira Airosa
Quintelas, C.
Pereira, M. F. R.
Neves, Isabel C.
Tavares, M. T.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Figueiredo, Hugo
Silva, Bruna Andreia Nogueira Airosa
Quintelas, C.
Pereira, M. F. R.
Neves, Isabel C.
Tavares, M. T.
dc.subject.por.fl_str_mv Alkali-treatment
Arthrobacter viscosus
Biosorbent
Cr(VI)
NaY Zeolite
Science & Technology
topic Alkali-treatment
Arthrobacter viscosus
Biosorbent
Cr(VI)
NaY Zeolite
Science & Technology
description The structural modification of external surface of NaY was investigated in order to enhance efficient biosorption systems consisting of a bacterial biofilm, Arthrobacter viscosus, supported on that zeolite, for removing hexavalent chromium from aqueous solutions. The supported bacterial biofilm reduces Cr(VI) to Cr(III) and this cation is then retained in the zeolite by ion exchange. NaY zeolite was modified by alkali-treatments using NaOH 2.0 M, with two different contact periods of time between the zeolite and the alkaline solutions, resulting in NaYA and in NaYB. The biosorbents supported on the modified NaY zeolite were tested in solutions with low concentration of chromium. The results showed that the modification of external surface of NaY zeolite allows an efficient Cr removal, and the maximum removal efficiency was observed for NaYA sample that was submitted to a smoother chemical treatment.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-01-01T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/1822/25951
url http://hdl.handle.net/1822/25951
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 1582-9596
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Institutul Politehnic din Iasi
publisher.none.fl_str_mv Institutul Politehnic din Iasi
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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