Trivalent chromium sorption on alginate beads
Autor(a) principal: | |
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Data de Publicação: | 1997 |
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/1822/1450 |
Resumo: | The applicability of trivalent chromium removal from aqueous solutions using calcium alginate beads was studied. The equilibrium isotherms were plotted at two temperatures. The relationship between the chromium sorbed and the calcium released was determined as well as the effect of alginate amount and initial pH on the equilibrium results. Chromium sorption kinetics were evaluated as a function of chromium initial concentration and temperature. Transport properties of trivalent chromium on alginate beads were characterised by calculating chromium diffusion coeffkients-the Linear Absorption Model and the Shrinking Core Model were assayed. Trivalent chromium removal from aqueous solutions, that made chromium alginate beads by directly dispensing the sodium alginate solution on chromium solutions, was also tested. Finally, a methodology for trivalent chromium removal with alginate is proposed. This method includes two steps: in the first, chromium is removed by using it as an agent for alginate bead formation (for chromium concentrations above 400 mg L-1); afterwards, the obtained solution is placed in contact with previously formed alginate beads for removal of the remaining chromium. |
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Trivalent chromium sorption on alginate beadsScience & TechnologyThe applicability of trivalent chromium removal from aqueous solutions using calcium alginate beads was studied. The equilibrium isotherms were plotted at two temperatures. The relationship between the chromium sorbed and the calcium released was determined as well as the effect of alginate amount and initial pH on the equilibrium results. Chromium sorption kinetics were evaluated as a function of chromium initial concentration and temperature. Transport properties of trivalent chromium on alginate beads were characterised by calculating chromium diffusion coeffkients-the Linear Absorption Model and the Shrinking Core Model were assayed. Trivalent chromium removal from aqueous solutions, that made chromium alginate beads by directly dispensing the sodium alginate solution on chromium solutions, was also tested. Finally, a methodology for trivalent chromium removal with alginate is proposed. This method includes two steps: in the first, chromium is removed by using it as an agent for alginate bead formation (for chromium concentrations above 400 mg L-1); afterwards, the obtained solution is placed in contact with previously formed alginate beads for removal of the remaining chromium.ElsevierUniversidade do MinhoAraújo, M. ManuelaTeixeira, J. A.19971997-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/1450eng"International biodeterioration and biodegradation". ISSN 0964-8305. (1997) 40:1 63-74.0964-830510.1016/S0964-8305(97)00064-4info: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:RCAAP2023-07-21T12:16:22Zoai:repositorium.sdum.uminho.pt:1822/1450Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:08:53.387909Repositório 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 |
Trivalent chromium sorption on alginate beads |
title |
Trivalent chromium sorption on alginate beads |
spellingShingle |
Trivalent chromium sorption on alginate beads Araújo, M. Manuela Science & Technology |
title_short |
Trivalent chromium sorption on alginate beads |
title_full |
Trivalent chromium sorption on alginate beads |
title_fullStr |
Trivalent chromium sorption on alginate beads |
title_full_unstemmed |
Trivalent chromium sorption on alginate beads |
title_sort |
Trivalent chromium sorption on alginate beads |
author |
Araújo, M. Manuela |
author_facet |
Araújo, M. Manuela Teixeira, J. A. |
author_role |
author |
author2 |
Teixeira, J. A. |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Araújo, M. Manuela Teixeira, J. A. |
dc.subject.por.fl_str_mv |
Science & Technology |
topic |
Science & Technology |
description |
The applicability of trivalent chromium removal from aqueous solutions using calcium alginate beads was studied. The equilibrium isotherms were plotted at two temperatures. The relationship between the chromium sorbed and the calcium released was determined as well as the effect of alginate amount and initial pH on the equilibrium results. Chromium sorption kinetics were evaluated as a function of chromium initial concentration and temperature. Transport properties of trivalent chromium on alginate beads were characterised by calculating chromium diffusion coeffkients-the Linear Absorption Model and the Shrinking Core Model were assayed. Trivalent chromium removal from aqueous solutions, that made chromium alginate beads by directly dispensing the sodium alginate solution on chromium solutions, was also tested. Finally, a methodology for trivalent chromium removal with alginate is proposed. This method includes two steps: in the first, chromium is removed by using it as an agent for alginate bead formation (for chromium concentrations above 400 mg L-1); afterwards, the obtained solution is placed in contact with previously formed alginate beads for removal of the remaining chromium. |
publishDate |
1997 |
dc.date.none.fl_str_mv |
1997 1997-01-01T00:00:00Z |
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/1822/1450 |
url |
http://hdl.handle.net/1822/1450 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
"International biodeterioration and biodegradation". ISSN 0964-8305. (1997) 40:1 63-74. 0964-8305 10.1016/S0964-8305(97)00064-4 |
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 |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
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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) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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