Estudo multivariado de algumas propriedades termodinâmicas dos elementos terras raras
Ano de defesa: | 2019 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
Centro de Ciências Naturais e Exatas |
Programa de Pós-Graduação: |
Programa de Pós-Graduação em Química
|
Departamento: |
Química
|
País: |
Brasil
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/16744 |
Resumo: | Lanthanides (La-Lu), Yttrium and Scandium form the group of rare earth elements (REE) are classified as light (LREE) and heavy (HREE). These elements are gaining prominence in surveys due to their economic potential as well as their industrial applications. The REEs have the effect of lanthanide contraction, which keeps their values of ionic radius and ΔfH° close, which causes the REEs to substitute essential ions such as Fe2+, Fe3+ and Ca2+ in plant matrices. A multivariate statistical study was carried out in order to verify if there is a grouping of the REE according to their extensive properties of ΔfH°, ΔfSo, ΔfGo and So. The main components analysis showed the effect of the counterion on ΔfH°, where the OH-, Cl-, PO43- variables showed a decreasing force effect in this thermodynamic parameter in the OH-> PO43-> Cl- order, and indicated that the number of atoms of ligand oxygen induces the value of ΔfH°. The hierarchical cluster analysis performed with the values of ΔfH°, ΔfSo, ΔfGo and So divided the compounds of (REE)FeO3, (REE)PO4, (REE)2O3, (REE)O2, (REE)2O2CO3II, (REE)2Zr2O7 and REE(OH)3 according to their molecular characteristics. Considering the values of ΔfH°, they were divided into three groups H (La, Ce, Pr, Nd and Sm), G (Eu) and F (Gd, Tb, Dy, Tm, Ho, Y, Er, Yb, Lu). The subdivision carried out with values of ΔfH° corroborates with the literature that classifies the REEs in LREE and HREE and assists in the understanding of the greater stability of the REE compounds found in geological matrices. |
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2019-06-05T11:21:29Z2019-06-05T11:21:29Z2019-02-22http://repositorio.ufsm.br/handle/1/16744Lanthanides (La-Lu), Yttrium and Scandium form the group of rare earth elements (REE) are classified as light (LREE) and heavy (HREE). These elements are gaining prominence in surveys due to their economic potential as well as their industrial applications. The REEs have the effect of lanthanide contraction, which keeps their values of ionic radius and ΔfH° close, which causes the REEs to substitute essential ions such as Fe2+, Fe3+ and Ca2+ in plant matrices. A multivariate statistical study was carried out in order to verify if there is a grouping of the REE according to their extensive properties of ΔfH°, ΔfSo, ΔfGo and So. The main components analysis showed the effect of the counterion on ΔfH°, where the OH-, Cl-, PO43- variables showed a decreasing force effect in this thermodynamic parameter in the OH-> PO43-> Cl- order, and indicated that the number of atoms of ligand oxygen induces the value of ΔfH°. The hierarchical cluster analysis performed with the values of ΔfH°, ΔfSo, ΔfGo and So divided the compounds of (REE)FeO3, (REE)PO4, (REE)2O3, (REE)O2, (REE)2O2CO3II, (REE)2Zr2O7 and REE(OH)3 according to their molecular characteristics. Considering the values of ΔfH°, they were divided into three groups H (La, Ce, Pr, Nd and Sm), G (Eu) and F (Gd, Tb, Dy, Tm, Ho, Y, Er, Yb, Lu). The subdivision carried out with values of ΔfH° corroborates with the literature that classifies the REEs in LREE and HREE and assists in the understanding of the greater stability of the REE compounds found in geological matrices.Os Lantanídeos (La-Lu), Ítrio e Escândio formam o grupo dos elementos terras raras (ETR) e são classificados como leves (ETRL) e pesados (ETRP). Estes elementos estão ganhando destaques em pesquisas devido seu potencial econômico, bem como suas aplicações industriais. Os ETR possuem o efeito de contração lantanídica, que mantém próximos seus valores de raio iônico e ΔfH°, o que faz com que os ETR substituam íons essenciais como Fe2+, Fe3+ e Ca2+ em matrizes vegetais. Realizou-se um estudo utilizando estatística multivariada, afim de se verificar, se há um agrupamento dos ETR de acordo com suas propriedades extensivas de ΔfH°, ΔfSo, ΔfGo e So. A análise de componentes principais apresentou o efeito do contra íon no ΔfH°, onde as variáveis OH-, Cl-, PO43- apresentaram efeito de força decrescente neste parâmetro termodinâmico na ordem OH- > PO43-> Cl-, bem como indicou que o número de átomos de oxigênio ligante induz o valor de ΔfH°. A análise de cluster hierárquico realizada com os valores de ΔfH°, ΔfSo, ΔfGo e So, dividiu em grupos os compostos de (ETR)FeO3, (ETR)PO4, (ETR)2O3, (ETR)O2, (ETR)2O2CO3II, (ETR)2Zr2O7 e ETR(OH)3 conforme suas características moleculares. Considerando os valores de ΔfH°, se dividiram em três grupos H (La, Ce, Pr, Nd e Sm), G (Eu) e F (Gd, Tb, Dy, Tm, Ho, Y, Er, Yb, Lu). Esta subdivisão realizada com valores de ΔfH° corrobora com a literatura que classifica os ETR em ETRL e ETRP e auxilia na compreensão da maior estabilidade dos compostos de ETR encontrados em matrizes geológicas.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESporUniversidade Federal de Santa MariaCentro de Ciências Naturais e ExatasPrograma de Pós-Graduação em QuímicaUFSMBrasilQuímicaAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessElementos terras rarasTermodinâmicaMultivariadaAnalise de componentes principaisAnalise de cluster hierárquicoRare earth elementsThermodynamicMultivariatePrincipal component analysisHierarchical cluster analysisCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICAEstudo multivariado de algumas propriedades termodinâmicas dos elementos terras rarasMultivariate study of some thermodynamic properties of rare earth elementsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisRosa, Marcelo Barcellos dahttp://lattes.cnpq.br/0308293154958870Cardoso, Carmem Dickowhttp://lattes.cnpq.br/3886927196242959Machado, Ênio Leandrohttp://lattes.cnpq.br/6922571767923420http://lattes.cnpq.br/4895641438195722Pereira, Hercules Abie1006000000006008b5ece49-3859-41c1-a27a-94fe03364b5af6e2f5b0-4eae-4db7-9ac8-0a2186dd03be73516172-cec5-4c94-9853-940b7b46a1c116bb7285-3cf9-4f72-bec0-d2ae192958f1reponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALDIS_PPGQUIMICA_2019_PEREIRA_HERCULES.pdfDIS_PPGQUIMICA_2019_PEREIRA_HERCULES.pdfDissertação de Mestradoapplication/pdf1448340http://repositorio.ufsm.br/bitstream/1/16744/1/DIS_PPGQUIMICA_2019_PEREIRA_HERCULES.pdfaf0b61590bc0525618fe1064fdaf0a61MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; 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dc.title.por.fl_str_mv |
Estudo multivariado de algumas propriedades termodinâmicas dos elementos terras raras |
dc.title.alternative.eng.fl_str_mv |
Multivariate study of some thermodynamic properties of rare earth elements |
title |
Estudo multivariado de algumas propriedades termodinâmicas dos elementos terras raras |
spellingShingle |
Estudo multivariado de algumas propriedades termodinâmicas dos elementos terras raras Pereira, Hercules Abie Elementos terras raras Termodinâmica Multivariada Analise de componentes principais Analise de cluster hierárquico Rare earth elements Thermodynamic Multivariate Principal component analysis Hierarchical cluster analysis CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Estudo multivariado de algumas propriedades termodinâmicas dos elementos terras raras |
title_full |
Estudo multivariado de algumas propriedades termodinâmicas dos elementos terras raras |
title_fullStr |
Estudo multivariado de algumas propriedades termodinâmicas dos elementos terras raras |
title_full_unstemmed |
Estudo multivariado de algumas propriedades termodinâmicas dos elementos terras raras |
title_sort |
Estudo multivariado de algumas propriedades termodinâmicas dos elementos terras raras |
author |
Pereira, Hercules Abie |
author_facet |
Pereira, Hercules Abie |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Rosa, Marcelo Barcellos da |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/0308293154958870 |
dc.contributor.referee1.fl_str_mv |
Cardoso, Carmem Dickow |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/3886927196242959 |
dc.contributor.referee2.fl_str_mv |
Machado, Ênio Leandro |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/6922571767923420 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/4895641438195722 |
dc.contributor.author.fl_str_mv |
Pereira, Hercules Abie |
contributor_str_mv |
Rosa, Marcelo Barcellos da Cardoso, Carmem Dickow Machado, Ênio Leandro |
dc.subject.por.fl_str_mv |
Elementos terras raras Termodinâmica Multivariada Analise de componentes principais Analise de cluster hierárquico |
topic |
Elementos terras raras Termodinâmica Multivariada Analise de componentes principais Analise de cluster hierárquico Rare earth elements Thermodynamic Multivariate Principal component analysis Hierarchical cluster analysis CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.eng.fl_str_mv |
Rare earth elements Thermodynamic Multivariate Principal component analysis Hierarchical cluster analysis |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
Lanthanides (La-Lu), Yttrium and Scandium form the group of rare earth elements (REE) are classified as light (LREE) and heavy (HREE). These elements are gaining prominence in surveys due to their economic potential as well as their industrial applications. The REEs have the effect of lanthanide contraction, which keeps their values of ionic radius and ΔfH° close, which causes the REEs to substitute essential ions such as Fe2+, Fe3+ and Ca2+ in plant matrices. A multivariate statistical study was carried out in order to verify if there is a grouping of the REE according to their extensive properties of ΔfH°, ΔfSo, ΔfGo and So. The main components analysis showed the effect of the counterion on ΔfH°, where the OH-, Cl-, PO43- variables showed a decreasing force effect in this thermodynamic parameter in the OH-> PO43-> Cl- order, and indicated that the number of atoms of ligand oxygen induces the value of ΔfH°. The hierarchical cluster analysis performed with the values of ΔfH°, ΔfSo, ΔfGo and So divided the compounds of (REE)FeO3, (REE)PO4, (REE)2O3, (REE)O2, (REE)2O2CO3II, (REE)2Zr2O7 and REE(OH)3 according to their molecular characteristics. Considering the values of ΔfH°, they were divided into three groups H (La, Ce, Pr, Nd and Sm), G (Eu) and F (Gd, Tb, Dy, Tm, Ho, Y, Er, Yb, Lu). The subdivision carried out with values of ΔfH° corroborates with the literature that classifies the REEs in LREE and HREE and assists in the understanding of the greater stability of the REE compounds found in geological matrices. |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-06-05T11:21:29Z |
dc.date.available.fl_str_mv |
2019-06-05T11:21:29Z |
dc.date.issued.fl_str_mv |
2019-02-22 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/16744 |
url |
http://repositorio.ufsm.br/handle/1/16744 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.cnpq.fl_str_mv |
100600000000 |
dc.relation.confidence.fl_str_mv |
600 |
dc.relation.authority.fl_str_mv |
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dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Ciências Naturais e Exatas |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Química |
dc.publisher.initials.fl_str_mv |
UFSM |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Química |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Ciências Naturais e Exatas |
dc.source.none.fl_str_mv |
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UFSM |
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