Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.14/7488 |
Resumo: | Aquatic environments are often exposed to toxic heavy metals, which gain access to the food chain via microalgae and may cause severe problems at higher trophic levels. However, such a metabolic specificity can be taken advantage of in bioremediation strategies. The potential of a novel wild strain of Scenedesmus obliquus, previously isolated from a heavy metal-contaminated site in northern Portugal, to remove Zn from aqueous solutions was thus studied, using several initial concentrations. The removal extent reached its maximum by 1 day: 836.5 mg Zn/g biomass, at the initial concentration of 75 mg/L, mainly by adsorption onto the cell surface. Comparative studies encompassing a commercially available strain of the same microalgal species led to a maximum removal extent of only 429.6 mg Zn/g biomass, under identical conditions. Heat-inactivated cells permitted a maximum removal of 209.6 mg Zn/g biomass, at an initial concentration of 50 mg Zn/L. The maximum adsorption capacity of Zn, estimated via Langmuir's isotherm, was 330 mg Zn/g biomass. Finally, Zn removal was highest at pH 6.0-7.0. It was proven, for the first time, that such a wild microalga can uptake and adsorb Zn very efficiently, which unfolds a particularly good potential for bioremediation. Its performance is far better than similar (reference) species, especially near neutrality, and even following heat-treatment. |
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Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquusMicroalgaeHeavy metal removalBioremediationInactivated cellspHLangmuir isothermAquatic environments are often exposed to toxic heavy metals, which gain access to the food chain via microalgae and may cause severe problems at higher trophic levels. However, such a metabolic specificity can be taken advantage of in bioremediation strategies. The potential of a novel wild strain of Scenedesmus obliquus, previously isolated from a heavy metal-contaminated site in northern Portugal, to remove Zn from aqueous solutions was thus studied, using several initial concentrations. The removal extent reached its maximum by 1 day: 836.5 mg Zn/g biomass, at the initial concentration of 75 mg/L, mainly by adsorption onto the cell surface. Comparative studies encompassing a commercially available strain of the same microalgal species led to a maximum removal extent of only 429.6 mg Zn/g biomass, under identical conditions. Heat-inactivated cells permitted a maximum removal of 209.6 mg Zn/g biomass, at an initial concentration of 50 mg Zn/L. The maximum adsorption capacity of Zn, estimated via Langmuir's isotherm, was 330 mg Zn/g biomass. Finally, Zn removal was highest at pH 6.0-7.0. It was proven, for the first time, that such a wild microalga can uptake and adsorb Zn very efficiently, which unfolds a particularly good potential for bioremediation. Its performance is far better than similar (reference) species, especially near neutrality, and even following heat-treatment.SpringerVeritati - Repositório Institucional da Universidade Católica PortuguesaMonteiro, Cristina M.Castro, Paula M. L.Malcata, F. Xavier2012-01-17T11:22:16Z20112011-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.14/7488engMONTEIRO, Cristina M.; CASTRO, Paula M. L.; MALCATA, F. Xavier - Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus. Environmental Chemistry Letters. ISSN 1610-3653. Vol.9 (2011), p.169–1761610-365310.1007/s10311-009-0258-21610-3661WOS:000291040900003info: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:RCAAP2023-07-12T17:13:11ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus |
title |
Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus |
spellingShingle |
Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus Monteiro, Cristina M. Microalgae Heavy metal removal Bioremediation Inactivated cells pH Langmuir isotherm |
title_short |
Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus |
title_full |
Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus |
title_fullStr |
Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus |
title_full_unstemmed |
Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus |
title_sort |
Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus |
author |
Monteiro, Cristina M. |
author_facet |
Monteiro, Cristina M. Castro, Paula M. L. Malcata, F. Xavier |
author_role |
author |
author2 |
Castro, Paula M. L. Malcata, F. Xavier |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Veritati - Repositório Institucional da Universidade Católica Portuguesa |
dc.contributor.author.fl_str_mv |
Monteiro, Cristina M. Castro, Paula M. L. Malcata, F. Xavier |
dc.subject.por.fl_str_mv |
Microalgae Heavy metal removal Bioremediation Inactivated cells pH Langmuir isotherm |
topic |
Microalgae Heavy metal removal Bioremediation Inactivated cells pH Langmuir isotherm |
description |
Aquatic environments are often exposed to toxic heavy metals, which gain access to the food chain via microalgae and may cause severe problems at higher trophic levels. However, such a metabolic specificity can be taken advantage of in bioremediation strategies. The potential of a novel wild strain of Scenedesmus obliquus, previously isolated from a heavy metal-contaminated site in northern Portugal, to remove Zn from aqueous solutions was thus studied, using several initial concentrations. The removal extent reached its maximum by 1 day: 836.5 mg Zn/g biomass, at the initial concentration of 75 mg/L, mainly by adsorption onto the cell surface. Comparative studies encompassing a commercially available strain of the same microalgal species led to a maximum removal extent of only 429.6 mg Zn/g biomass, under identical conditions. Heat-inactivated cells permitted a maximum removal of 209.6 mg Zn/g biomass, at an initial concentration of 50 mg Zn/L. The maximum adsorption capacity of Zn, estimated via Langmuir's isotherm, was 330 mg Zn/g biomass. Finally, Zn removal was highest at pH 6.0-7.0. It was proven, for the first time, that such a wild microalga can uptake and adsorb Zn very efficiently, which unfolds a particularly good potential for bioremediation. Its performance is far better than similar (reference) species, especially near neutrality, and even following heat-treatment. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011 2011-01-01T00:00:00Z 2012-01-17T11:22:16Z |
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/10400.14/7488 |
url |
http://hdl.handle.net/10400.14/7488 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
MONTEIRO, Cristina M.; CASTRO, Paula M. L.; MALCATA, F. Xavier - Biosorption of zinc ions from aqueous solution by the microalga Scenedesmus obliquus. Environmental Chemistry Letters. ISSN 1610-3653. Vol.9 (2011), p.169–176 1610-3653 10.1007/s10311-009-0258-2 1610-3661 WOS:000291040900003 |
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 |
Springer |
publisher.none.fl_str_mv |
Springer |
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 |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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repository.mail.fl_str_mv |
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1777303123734298624 |