Adsorção de íons fosfato em óxido de nióbio hidratado

Detalhes bibliográficos
Autor(a) principal: Rodrigues,Liana Alvares
Data de Publicação: 2009
Outros Autores: Silva,Maria Lúcia Caetano Pinto da
Tipo de documento: Artigo
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000500023
Resumo: The adsorption kinetics of phosphate on Nb2O5.nH2O was investigated at initial phosphate concentrations 0.25, 0.50 and 1.00 mg.L-1. The kinetic process was described by a pseudo-second-order rate model very well. The adsorption thermodynamics was carried out at 298, 308, 318, 328 and 338 K. The positive values of both ΔH and ΔS suggest an endothermic reaction and increase in randomness at the solid-liquid interface during the adsorption. ΔG values obtained were negative indicating a spontaneous adsorption process. The Langmuir model described the data better than the Freundlich isotherm model. The effective desorption could be achieved using water at pH 12.
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spelling Adsorção de íons fosfato em óxido de nióbio hidratadoadsorption of phosphate ionskinetics modelsLangmuirThe adsorption kinetics of phosphate on Nb2O5.nH2O was investigated at initial phosphate concentrations 0.25, 0.50 and 1.00 mg.L-1. The kinetic process was described by a pseudo-second-order rate model very well. The adsorption thermodynamics was carried out at 298, 308, 318, 328 and 338 K. The positive values of both ΔH and ΔS suggest an endothermic reaction and increase in randomness at the solid-liquid interface during the adsorption. ΔG values obtained were negative indicating a spontaneous adsorption process. The Langmuir model described the data better than the Freundlich isotherm model. The effective desorption could be achieved using water at pH 12.Sociedade Brasileira de Química2009-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000500023Química Nova v.32 n.5 2009reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422009000500023info:eu-repo/semantics/openAccessRodrigues,Liana AlvaresSilva,Maria Lúcia Caetano Pinto dapor2009-07-30T00:00:00Zoai:scielo:S0100-40422009000500023Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2009-07-30T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Adsorção de íons fosfato em óxido de nióbio hidratado
title Adsorção de íons fosfato em óxido de nióbio hidratado
spellingShingle Adsorção de íons fosfato em óxido de nióbio hidratado
Rodrigues,Liana Alvares
adsorption of phosphate ions
kinetics models
Langmuir
title_short Adsorção de íons fosfato em óxido de nióbio hidratado
title_full Adsorção de íons fosfato em óxido de nióbio hidratado
title_fullStr Adsorção de íons fosfato em óxido de nióbio hidratado
title_full_unstemmed Adsorção de íons fosfato em óxido de nióbio hidratado
title_sort Adsorção de íons fosfato em óxido de nióbio hidratado
author Rodrigues,Liana Alvares
author_facet Rodrigues,Liana Alvares
Silva,Maria Lúcia Caetano Pinto da
author_role author
author2 Silva,Maria Lúcia Caetano Pinto da
author2_role author
dc.contributor.author.fl_str_mv Rodrigues,Liana Alvares
Silva,Maria Lúcia Caetano Pinto da
dc.subject.por.fl_str_mv adsorption of phosphate ions
kinetics models
Langmuir
topic adsorption of phosphate ions
kinetics models
Langmuir
description The adsorption kinetics of phosphate on Nb2O5.nH2O was investigated at initial phosphate concentrations 0.25, 0.50 and 1.00 mg.L-1. The kinetic process was described by a pseudo-second-order rate model very well. The adsorption thermodynamics was carried out at 298, 308, 318, 328 and 338 K. The positive values of both ΔH and ΔS suggest an endothermic reaction and increase in randomness at the solid-liquid interface during the adsorption. ΔG values obtained were negative indicating a spontaneous adsorption process. The Langmuir model described the data better than the Freundlich isotherm model. The effective desorption could be achieved using water at pH 12.
publishDate 2009
dc.date.none.fl_str_mv 2009-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000500023
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000500023
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.1590/S0100-40422009000500023
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Química Nova v.32 n.5 2009
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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