Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis
Ano de defesa: | 2023 |
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Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | |
Tipo de documento: | Dissertação |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Não Informado pela instituição
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Programa de Pós-Graduação: |
Pós-Graduação em Química
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Departamento: |
Não Informado pela instituição
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País: |
Não Informado pela instituição
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Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | https://ri.ufs.br/jspui/handle/riufs/18373 |
Resumo: | Mixed oxides are studied for several applications, among them those that can deal with catalysis or adsorption phenomena. In this work, the effect of the synthesis route and the effect of the dopant metal to obtain mixed oxides of pyrochlore structure with theoretical composition La2,0Zr2,0O7 and La2,0M0,3Zr1,7O7 (M = Ni or Fe) on the formation of the phase and removal efficiency of Congo red textile dye. The materials were synthesized by the modified protein method using collagen as a chelating agent, heat treated at 350 °C and subjected to calcination at 900 °C. The materials were characterized by Fourier transform infrared spectrophotometry (FTIR), thermogravimetry (TG), X-ray diffraction (XRD) by the powder method, scanning electron microscopy (SEM), N2 adsorption at 77K and point of zero charge (PZC). The results obtained indicated the formation of the pyrochlore phase in the three materials, with formation of secondary phases in the doped materials. The FTIR spectra showed differences between the heat-treated and calcined materials, especially regarding the metal-oxygen bond (M-O). The method proved to be quite effective in forming the desired phase, obtaining materials with high surface area and smaller crystallite size compared to other methods. The obtained materials were submitted to Congo red dye adsorption studies. The LZO material proved to be efficient in the adsorption process with Emax = 93%. The studies referring to the contact time and analysis temperature showed that as the temperature increases, the adsorption efficiency decreases. The experimental data were applied to kinetic models of pseudo first order, pseudo second order and variable constants. The materials were submitted to the study of reuse in cycles maintaining high removal efficiency. The adsorbents obtained were also submitted to industrial effluent removal tests and compared with silica gel and activated carbon materials, presenting results similar to those of industrially known materials. It was proven that the pyrochlore structure remained after the adsorption studies, which indicates stability and the possibility of reuse. |
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Firmino, Valber Eduardo SilvaSouza, Anne Michelle Garrido Pedrosa de2023-09-23T00:20:33Z2023-09-23T00:20:33Z2023-07-20FIRMINO, Valber Eduardo Silva. Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis. 2023. 99 f. Dissertação (Mestrado em Química) - Universidade Federal de Sergipe, São Cristóvão, 2023.https://ri.ufs.br/jspui/handle/riufs/18373Mixed oxides are studied for several applications, among them those that can deal with catalysis or adsorption phenomena. In this work, the effect of the synthesis route and the effect of the dopant metal to obtain mixed oxides of pyrochlore structure with theoretical composition La2,0Zr2,0O7 and La2,0M0,3Zr1,7O7 (M = Ni or Fe) on the formation of the phase and removal efficiency of Congo red textile dye. The materials were synthesized by the modified protein method using collagen as a chelating agent, heat treated at 350 °C and subjected to calcination at 900 °C. The materials were characterized by Fourier transform infrared spectrophotometry (FTIR), thermogravimetry (TG), X-ray diffraction (XRD) by the powder method, scanning electron microscopy (SEM), N2 adsorption at 77K and point of zero charge (PZC). The results obtained indicated the formation of the pyrochlore phase in the three materials, with formation of secondary phases in the doped materials. The FTIR spectra showed differences between the heat-treated and calcined materials, especially regarding the metal-oxygen bond (M-O). The method proved to be quite effective in forming the desired phase, obtaining materials with high surface area and smaller crystallite size compared to other methods. The obtained materials were submitted to Congo red dye adsorption studies. The LZO material proved to be efficient in the adsorption process with Emax = 93%. The studies referring to the contact time and analysis temperature showed that as the temperature increases, the adsorption efficiency decreases. The experimental data were applied to kinetic models of pseudo first order, pseudo second order and variable constants. The materials were submitted to the study of reuse in cycles maintaining high removal efficiency. The adsorbents obtained were also submitted to industrial effluent removal tests and compared with silica gel and activated carbon materials, presenting results similar to those of industrially known materials. It was proven that the pyrochlore structure remained after the adsorption studies, which indicates stability and the possibility of reuse.Óxidos mistos são estudados para diversas aplicações, dentre elas as que podem versar em fenômenos de catálise ou adsorção. Neste trabalho foi estudado o efeito da rota de síntese e o efeito do metal dopante para obtenção de óxidos mistos de estrutura pirocloro com composição teórica La2,0Zr2,0O7 e La2,0M0,3Zr1,7O7 (M = Ni ou Fe) na formação da fase e na eficiência de remoção do corante têxtil vermelho do Congo. Os materiais foram sintetizados pelo método proteico modificado utilizando o colágeno como agente quelante, tratados termicamente a 350 °C e submetidos à calcinação a 900 °C. Os materiais foram caracterizados através da espectrofotometria na região do infravermelho com transformada de Fourier (FTIR), termogravimetria (TG), difração de raios X (DRX) pelo método do pó, microscopia eletrônica de varredura (MEV), adsorção de N2 a 77K e ponto de carga zero (PCZ). Os resultados obtidos indicaram a formação da fase pirocloro nos três materiais, com formação de fases secundárias nos materiais dopados. Os espectros FTIR mostraram diferenças entre os materiais tratados termicamente e os calcinados, sobretudo referente à ligação metal-oxigênio (M-O). O método mostrou-se bastante eficaz na formação da fase desejada obtendo materiais com elevada área superficial e menor tamanho de cristalito em comparação com outros métodos. Os materiais obtidos foram submetidos a estudos de adsorção do corante vermelho do Congo. O material LZO mostrou-se eficiente no processo de adsorção com Emáx = 93%. Os estudos referentes ao tempo de contato e temperatura de análise mostraram que a medida em que a temperatura aumenta, reduz a eficiência de adsorção. Os dados experimentais foram aplicados a modelos cinéticos de pseudo primeira ordem, pseudo segunda ordem e constantes variáveis. Os materiais foram submetidos ao estudo de reutilização em ciclos mantendo alta eficiência de remoção. Os adsorventes obtidos também foram submetidos a testes de remoção de efluente industrial e comparados com os materiais sílica gel e carvão ativado apresentando resultados similares a de materiais industrialmente conhecidos. Foi comprovado que a estrutura pirocloro se manteve após os estudos de adsorção, o que indica estabilidade e possibilidade de reutilização.Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqSão CristóvãoporMineraisCorantesAdsorçãoÓxidos mistosPirocloroProteico modificadoMixed oxidesPyrochloreModified proteicDyesAdsorptionCIENCIAS EXATAS E DA TERRA::QUIMICAÓxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteisMixed oxides based on lantanum and zirconium with iron or nickel doping: structural characteristics and textile dye removalinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisPós-Graduação em QuímicaUniversidade Federal de Sergipe (UFS)reponame:Repositório Institucional da UFSinstname:Universidade Federal de Sergipe (UFS)instacron:UFSinfo:eu-repo/semantics/openAccessLICENSElicense.txtlicense.txttext/plain; charset=utf-81475https://ri.ufs.br/jspui/bitstream/riufs/18373/1/license.txt098cbbf65c2c15e1fb2e49c5d306a44cMD51ORIGINALVALBER_EDUARDO_SILVA_FIRMINO.pdfVALBER_EDUARDO_SILVA_FIRMINO.pdfapplication/pdf4512366https://ri.ufs.br/jspui/bitstream/riufs/18373/2/VALBER_EDUARDO_SILVA_FIRMINO.pdf47e5b0bee7b759a7f8ac9f7c48583abcMD52riufs/183732023-09-22 21:20:39.149oai:ufs.br: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Repositório InstitucionalPUBhttps://ri.ufs.br/oai/requestrepositorio@academico.ufs.bropendoar:2023-09-23T00:20:39Repositório Institucional da UFS - Universidade Federal de Sergipe (UFS)false |
dc.title.pt_BR.fl_str_mv |
Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis |
dc.title.alternative.por.fl_str_mv |
Mixed oxides based on lantanum and zirconium with iron or nickel doping: structural characteristics and textile dye removal |
title |
Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis |
spellingShingle |
Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis Firmino, Valber Eduardo Silva Minerais Corantes Adsorção Óxidos mistos Pirocloro Proteico modificado Mixed oxides Pyrochlore Modified proteic Dyes Adsorption CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis |
title_full |
Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis |
title_fullStr |
Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis |
title_full_unstemmed |
Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis |
title_sort |
Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis |
author |
Firmino, Valber Eduardo Silva |
author_facet |
Firmino, Valber Eduardo Silva |
author_role |
author |
dc.contributor.author.fl_str_mv |
Firmino, Valber Eduardo Silva |
dc.contributor.advisor1.fl_str_mv |
Souza, Anne Michelle Garrido Pedrosa de |
contributor_str_mv |
Souza, Anne Michelle Garrido Pedrosa de |
dc.subject.por.fl_str_mv |
Minerais Corantes Adsorção Óxidos mistos Pirocloro Proteico modificado |
topic |
Minerais Corantes Adsorção Óxidos mistos Pirocloro Proteico modificado Mixed oxides Pyrochlore Modified proteic Dyes Adsorption CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.eng.fl_str_mv |
Mixed oxides Pyrochlore Modified proteic Dyes Adsorption |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
Mixed oxides are studied for several applications, among them those that can deal with catalysis or adsorption phenomena. In this work, the effect of the synthesis route and the effect of the dopant metal to obtain mixed oxides of pyrochlore structure with theoretical composition La2,0Zr2,0O7 and La2,0M0,3Zr1,7O7 (M = Ni or Fe) on the formation of the phase and removal efficiency of Congo red textile dye. The materials were synthesized by the modified protein method using collagen as a chelating agent, heat treated at 350 °C and subjected to calcination at 900 °C. The materials were characterized by Fourier transform infrared spectrophotometry (FTIR), thermogravimetry (TG), X-ray diffraction (XRD) by the powder method, scanning electron microscopy (SEM), N2 adsorption at 77K and point of zero charge (PZC). The results obtained indicated the formation of the pyrochlore phase in the three materials, with formation of secondary phases in the doped materials. The FTIR spectra showed differences between the heat-treated and calcined materials, especially regarding the metal-oxygen bond (M-O). The method proved to be quite effective in forming the desired phase, obtaining materials with high surface area and smaller crystallite size compared to other methods. The obtained materials were submitted to Congo red dye adsorption studies. The LZO material proved to be efficient in the adsorption process with Emax = 93%. The studies referring to the contact time and analysis temperature showed that as the temperature increases, the adsorption efficiency decreases. The experimental data were applied to kinetic models of pseudo first order, pseudo second order and variable constants. The materials were submitted to the study of reuse in cycles maintaining high removal efficiency. The adsorbents obtained were also submitted to industrial effluent removal tests and compared with silica gel and activated carbon materials, presenting results similar to those of industrially known materials. It was proven that the pyrochlore structure remained after the adsorption studies, which indicates stability and the possibility of reuse. |
publishDate |
2023 |
dc.date.accessioned.fl_str_mv |
2023-09-23T00:20:33Z |
dc.date.available.fl_str_mv |
2023-09-23T00:20:33Z |
dc.date.issued.fl_str_mv |
2023-07-20 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
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masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
FIRMINO, Valber Eduardo Silva. Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis. 2023. 99 f. Dissertação (Mestrado em Química) - Universidade Federal de Sergipe, São Cristóvão, 2023. |
dc.identifier.uri.fl_str_mv |
https://ri.ufs.br/jspui/handle/riufs/18373 |
identifier_str_mv |
FIRMINO, Valber Eduardo Silva. Óxidos mistos a base de lantânio e zircônio com dopagem de ferro ou níquel: características estruturais e remoção de corantes têxteis. 2023. 99 f. Dissertação (Mestrado em Química) - Universidade Federal de Sergipe, São Cristóvão, 2023. |
url |
https://ri.ufs.br/jspui/handle/riufs/18373 |
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Pós-Graduação em Química |
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Universidade Federal de Sergipe (UFS) |
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