Retention of Cr(VI) and Pb(II) on a loamy sand soil: kinetics, equilibria and breakthrough
Autor(a) principal: | |
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Data de Publicação: | 2009 |
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/1822/9445 |
Resumo: | Illegal discharges are of great concern among industry activities, since they occur under uncontrolled conditions. In most cases, effluents are acidic and the concentrations of heavy metals are very high. With this in mind, the main goal of this study was to evaluate the sorption on a soil of two of the most toxic heavy metals, Cr(VI) and Pb(II), in those conditions. A loamy sand soil was collected in Oporto, Portugal. Batch equilibrium and sorption kinetics were evaluated using both metals solutions, with concentrations ranging from 50 mg L−1 to 200 mg L−1, at pH 2 and 5, between 2 h and 288 h. To evaluate the sorption equilibrium, eight isotherm models were fitted to experimental data. The best adjustments were observed for the Redlich–Peterson and Khan models for the adsorption of chromium (R2 = 0.99), and of lead (R2 = 0.99), respectively. The sorption kinetics was evaluated using three models – Elovich, pseudo first order and an empirical power function. The retention of lead was almost instantaneous and the empirical power function described better the sorption kinetics of chromium (0.89 < R2 < 0.99). In addition, flow experiments were performed with effluents of both metals (50 mg L−1) at pH 2 and 5, for about 90 h. Results revealed a high retention of chromium and a weak retention of lead, for low pH values. FTIR analyses to the column samples revealed that clay minerals have an important role in the retention of both metals. |
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Retention of Cr(VI) and Pb(II) on a loamy sand soil: kinetics, equilibria and breakthroughAdsorption equilibriaBreakthroughpHHeavy metalsSoilScience & TechnologyIllegal discharges are of great concern among industry activities, since they occur under uncontrolled conditions. In most cases, effluents are acidic and the concentrations of heavy metals are very high. With this in mind, the main goal of this study was to evaluate the sorption on a soil of two of the most toxic heavy metals, Cr(VI) and Pb(II), in those conditions. A loamy sand soil was collected in Oporto, Portugal. Batch equilibrium and sorption kinetics were evaluated using both metals solutions, with concentrations ranging from 50 mg L−1 to 200 mg L−1, at pH 2 and 5, between 2 h and 288 h. To evaluate the sorption equilibrium, eight isotherm models were fitted to experimental data. The best adjustments were observed for the Redlich–Peterson and Khan models for the adsorption of chromium (R2 = 0.99), and of lead (R2 = 0.99), respectively. The sorption kinetics was evaluated using three models – Elovich, pseudo first order and an empirical power function. The retention of lead was almost instantaneous and the empirical power function described better the sorption kinetics of chromium (0.89 < R2 < 0.99). In addition, flow experiments were performed with effluents of both metals (50 mg L−1) at pH 2 and 5, for about 90 h. Results revealed a high retention of chromium and a weak retention of lead, for low pH values. FTIR analyses to the column samples revealed that clay minerals have an important role in the retention of both metals.Fundação para a Ciência e a Tecnologia (FCT)ElsevierUniversidade do MinhoFonseca, BrunaMaio, H.Quintelas, C.Teixeira, J. A.Tavares, M. T.2009-102009-10-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/9445eng"Chemical Engineering Journal". ISSN 1385-8947. 152:1 (Oct. 2009) 212-219.1385-894710.1016/j.cej.2009.04.045info: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:RCAAP2023-07-21T12:35:58Zoai:repositorium.sdum.uminho.pt:1822/9445Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:31:55.828464Repositório 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 |
Retention of Cr(VI) and Pb(II) on a loamy sand soil: kinetics, equilibria and breakthrough |
title |
Retention of Cr(VI) and Pb(II) on a loamy sand soil: kinetics, equilibria and breakthrough |
spellingShingle |
Retention of Cr(VI) and Pb(II) on a loamy sand soil: kinetics, equilibria and breakthrough Fonseca, Bruna Adsorption equilibria Breakthrough pH Heavy metals Soil Science & Technology |
title_short |
Retention of Cr(VI) and Pb(II) on a loamy sand soil: kinetics, equilibria and breakthrough |
title_full |
Retention of Cr(VI) and Pb(II) on a loamy sand soil: kinetics, equilibria and breakthrough |
title_fullStr |
Retention of Cr(VI) and Pb(II) on a loamy sand soil: kinetics, equilibria and breakthrough |
title_full_unstemmed |
Retention of Cr(VI) and Pb(II) on a loamy sand soil: kinetics, equilibria and breakthrough |
title_sort |
Retention of Cr(VI) and Pb(II) on a loamy sand soil: kinetics, equilibria and breakthrough |
author |
Fonseca, Bruna |
author_facet |
Fonseca, Bruna Maio, H. Quintelas, C. Teixeira, J. A. Tavares, M. T. |
author_role |
author |
author2 |
Maio, H. Quintelas, C. Teixeira, J. A. Tavares, M. T. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Fonseca, Bruna Maio, H. Quintelas, C. Teixeira, J. A. Tavares, M. T. |
dc.subject.por.fl_str_mv |
Adsorption equilibria Breakthrough pH Heavy metals Soil Science & Technology |
topic |
Adsorption equilibria Breakthrough pH Heavy metals Soil Science & Technology |
description |
Illegal discharges are of great concern among industry activities, since they occur under uncontrolled conditions. In most cases, effluents are acidic and the concentrations of heavy metals are very high. With this in mind, the main goal of this study was to evaluate the sorption on a soil of two of the most toxic heavy metals, Cr(VI) and Pb(II), in those conditions. A loamy sand soil was collected in Oporto, Portugal. Batch equilibrium and sorption kinetics were evaluated using both metals solutions, with concentrations ranging from 50 mg L−1 to 200 mg L−1, at pH 2 and 5, between 2 h and 288 h. To evaluate the sorption equilibrium, eight isotherm models were fitted to experimental data. The best adjustments were observed for the Redlich–Peterson and Khan models for the adsorption of chromium (R2 = 0.99), and of lead (R2 = 0.99), respectively. The sorption kinetics was evaluated using three models – Elovich, pseudo first order and an empirical power function. The retention of lead was almost instantaneous and the empirical power function described better the sorption kinetics of chromium (0.89 < R2 < 0.99). In addition, flow experiments were performed with effluents of both metals (50 mg L−1) at pH 2 and 5, for about 90 h. Results revealed a high retention of chromium and a weak retention of lead, for low pH values. FTIR analyses to the column samples revealed that clay minerals have an important role in the retention of both metals. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009-10 2009-10-01T00:00:00Z |
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/1822/9445 |
url |
http://hdl.handle.net/1822/9445 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
"Chemical Engineering Journal". ISSN 1385-8947. 152:1 (Oct. 2009) 212-219. 1385-8947 10.1016/j.cej.2009.04.045 |
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 |
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 |
institution |
RCAAP |
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 |
repository.mail.fl_str_mv |
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1799132830069948416 |