Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D)
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações do Mackenzie |
Texto Completo: | https://dspace.mackenzie.br/handle/10899/28440 |
Resumo: | With the advent of graphene, in 2004 by Geim and Novoselov, this new twodimensional (2D) material and its derivatives such as graphene oxide (GO) and reduced graphene oxide (rGO), have been widely studied and used in the development of several technologies, such as energy conversion and storage devices, optoelectronics, (bio) sensors, composite materials, among others. The main way to obtain GO is through the oxidation of graphite, using the Hummers method, by strong oxidizing agents. However, the GO purification process is a key parameter in the production of this 2D material. This step demands a large volume of water, energy and time. The inefficient removal of the contaminants (residual species from the synthesis process, such as ions and metal oxides) present in GO may affect GO properties and turn unfeasible some applications, as in the biological field. In this sense, this thesis demonstrates the development of a new purification device, which involves a continuous flow system, coupled to a diffusion cell, with a microporous nitrocellulose membrane. The contaminant removal process is led by a concentration gradient. The purification system developed in this work had its efficiency compared to traditional purification methods, such as dialysis and centrifugation. It was also evaluated how the contaminants impurities and the purification processes can impact the structural, morphological and electrochemical behavior of the GO. In addition, the contaminants impurities were quantified by pH and conductivity measurements of the GO dispersions and analyzed by ion chromatography and graphite furnace atomic absorption spectrometry. The purification device developed by this work, achieves the best performance in the removal of the major contaminants (K+(aq.), Na+(aq.), Cl-(aq.), SO42-(aq.), Mn2+(aq.) and MnO2(s)), demanding ~95% less water than dialysis and in a shorter time (~23 h). The system operates in flow, with a minimum handling of the operator and allows to preserve and select the GO sheets by the pore size of the membrane used. This work represents a simple and fast alternative to purification of GO dispersion that can be easily scaled-up and applied in the purification of other dispersions of 2D materials. |
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2021-12-15T19:31:43Z2021-12-15T19:31:43Z2020-06-08SANTOS, Marcos Alves dos. Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D). 2020. 102 f. Tese (Engenharia de Materiais e Nanotecnologia) - Universidade Presbiteriana Mackenzie, São Paulo, 2020.https://dspace.mackenzie.br/handle/10899/28440With the advent of graphene, in 2004 by Geim and Novoselov, this new twodimensional (2D) material and its derivatives such as graphene oxide (GO) and reduced graphene oxide (rGO), have been widely studied and used in the development of several technologies, such as energy conversion and storage devices, optoelectronics, (bio) sensors, composite materials, among others. The main way to obtain GO is through the oxidation of graphite, using the Hummers method, by strong oxidizing agents. However, the GO purification process is a key parameter in the production of this 2D material. This step demands a large volume of water, energy and time. The inefficient removal of the contaminants (residual species from the synthesis process, such as ions and metal oxides) present in GO may affect GO properties and turn unfeasible some applications, as in the biological field. In this sense, this thesis demonstrates the development of a new purification device, which involves a continuous flow system, coupled to a diffusion cell, with a microporous nitrocellulose membrane. The contaminant removal process is led by a concentration gradient. The purification system developed in this work had its efficiency compared to traditional purification methods, such as dialysis and centrifugation. It was also evaluated how the contaminants impurities and the purification processes can impact the structural, morphological and electrochemical behavior of the GO. In addition, the contaminants impurities were quantified by pH and conductivity measurements of the GO dispersions and analyzed by ion chromatography and graphite furnace atomic absorption spectrometry. The purification device developed by this work, achieves the best performance in the removal of the major contaminants (K+(aq.), Na+(aq.), Cl-(aq.), SO42-(aq.), Mn2+(aq.) and MnO2(s)), demanding ~95% less water than dialysis and in a shorter time (~23 h). The system operates in flow, with a minimum handling of the operator and allows to preserve and select the GO sheets by the pore size of the membrane used. This work represents a simple and fast alternative to purification of GO dispersion that can be easily scaled-up and applied in the purification of other dispersions of 2D materials.Com o advento do grafeno, em 2004 por Geim e Novoselov, este novo material bidimensional (2D) e seus derivados como o oxido de grafeno (GO) e oxido de grafeno reduzido (rGO), vem sendo amplamente estudados e empregados no desenvolvimento de inúmeras tecnologias, como dispositivos de conversão e armazenamento de energia, optoeletrônica, (bio)sensores, materiais compósitos entre outras. A principal forma de obtenção do GO se da através da oxidação do grafite, pelo método de Hummers, pelo uso de agentes oxidantes fortes. Porem o processo de purificação do GO e um parâmetro-chave na produção desse material 2D. Esta etapa exige um grande volume de agua, energia e tempo. A remoção ineficiente dos contaminantes (espécies residuais do processo de síntese, como íons e óxidos metálicos) presentes no GO pode afetar as propriedades deste e ate inviabilizar algumas aplicações, como no campo biológico. Neste sentido, esta tese demonstra o desenvolvimento de um novo dispositivo de purificação, que envolve um sistema em fluxo continuo, acoplado a uma célula de difusão, com uma membrana de nitrocelulose microporosa. A remoção dos contaminantes e governada por um gradiente de concentração. O sistema de purificação desenvolvido neste trabalho teve sua eficiência comparada com os métodos tradicionais de purificação, como dialise e centrifugação. Foi também avaliado como as impurezas contaminantes e os processos de purificação podem impactar nas características estruturais, morfológicas e o comportamento eletroquímicas do GO. Além disso, as impurezas contaminantes foram quantificadas através de medidas de pH e condutividade das dispersões de GO e analises de cromatografia de íons e espectrometria de absorção atômica com forno de grafite. O dispositivo de purificação desenvolvido por este trabalho, obteve o melhor desempenho na remoção dos principais contaminantes das dispersões de GO (K+(aq.), Na+(aq.), Cl- (aq.), SO42-(aq.), Mn2+(aq.) e MnO2(s)) exigindo ~ 95% menos agua que os processos de dialise e em um tempo menor (~ 23 h). O sistema opera em fluxo, com uma manipulação mínima do operador e permite preservar e selecionar as folhas de GO através do tamanho de poro da membrana utilizada. Este trabalho representa uma alternativa simples e rápida a purificação das dispersões de GO, que pode ser facilmente escalonada e aplicada na purificação de outras dispersões de materiais 2D.Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorapplication/pdfporUniversidade Presbiteriana MackenzieEngenharia de Materiais e NanotecnologiaUPMBrasilEscola de Engenharia Mackenzie (EE)http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessóxido de grafenocontaminantespurificaçãoCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA::ANALISE DE TRACOS E QUIMICA AMBIENTALCNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA::INSTRUMENTACAO ANALITICACNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICADesenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D)info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisSilva, Cecília de Carvalho Castro 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Digital de Teses e Dissertaçõeshttp://tede.mackenzie.br/jspui/PRI |
dc.title.por.fl_str_mv |
Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D) |
title |
Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D) |
spellingShingle |
Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D) Santos, Marcos Alves dos óxido de grafeno contaminantes purificação CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA::ANALISE DE TRACOS E QUIMICA AMBIENTAL CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA::INSTRUMENTACAO ANALITICA CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D) |
title_full |
Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D) |
title_fullStr |
Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D) |
title_full_unstemmed |
Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D) |
title_sort |
Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D) |
author |
Santos, Marcos Alves dos |
author_facet |
Santos, Marcos Alves dos |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Silva, Cecília de Carvalho Castro e |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/6889517148629242 |
dc.contributor.referee1.fl_str_mv |
Maroneze, Camila Marchetti |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/2414168927233444 |
dc.contributor.referee2.fl_str_mv |
Domingues, Sergio Humberto |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/3585264786800637 |
dc.contributor.referee3.fl_str_mv |
Angnes, Lúcio |
dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/1936337806232049 |
dc.contributor.referee4.fl_str_mv |
Rubio, Mario Ricardo Gongora |
dc.contributor.referee4Lattes.fl_str_mv |
http://lattes.cnpq.br/7243762377593371 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/2753587274703527 |
dc.contributor.author.fl_str_mv |
Santos, Marcos Alves dos |
contributor_str_mv |
Silva, Cecília de Carvalho Castro e Maroneze, Camila Marchetti Domingues, Sergio Humberto Angnes, Lúcio Rubio, Mario Ricardo Gongora |
dc.subject.por.fl_str_mv |
óxido de grafeno contaminantes purificação |
topic |
óxido de grafeno contaminantes purificação CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA::ANALISE DE TRACOS E QUIMICA AMBIENTAL CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA::INSTRUMENTACAO ANALITICA CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA::ANALISE DE TRACOS E QUIMICA AMBIENTAL CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA::INSTRUMENTACAO ANALITICA CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
With the advent of graphene, in 2004 by Geim and Novoselov, this new twodimensional (2D) material and its derivatives such as graphene oxide (GO) and reduced graphene oxide (rGO), have been widely studied and used in the development of several technologies, such as energy conversion and storage devices, optoelectronics, (bio) sensors, composite materials, among others. The main way to obtain GO is through the oxidation of graphite, using the Hummers method, by strong oxidizing agents. However, the GO purification process is a key parameter in the production of this 2D material. This step demands a large volume of water, energy and time. The inefficient removal of the contaminants (residual species from the synthesis process, such as ions and metal oxides) present in GO may affect GO properties and turn unfeasible some applications, as in the biological field. In this sense, this thesis demonstrates the development of a new purification device, which involves a continuous flow system, coupled to a diffusion cell, with a microporous nitrocellulose membrane. The contaminant removal process is led by a concentration gradient. The purification system developed in this work had its efficiency compared to traditional purification methods, such as dialysis and centrifugation. It was also evaluated how the contaminants impurities and the purification processes can impact the structural, morphological and electrochemical behavior of the GO. In addition, the contaminants impurities were quantified by pH and conductivity measurements of the GO dispersions and analyzed by ion chromatography and graphite furnace atomic absorption spectrometry. The purification device developed by this work, achieves the best performance in the removal of the major contaminants (K+(aq.), Na+(aq.), Cl-(aq.), SO42-(aq.), Mn2+(aq.) and MnO2(s)), demanding ~95% less water than dialysis and in a shorter time (~23 h). The system operates in flow, with a minimum handling of the operator and allows to preserve and select the GO sheets by the pore size of the membrane used. This work represents a simple and fast alternative to purification of GO dispersion that can be easily scaled-up and applied in the purification of other dispersions of 2D materials. |
publishDate |
2020 |
dc.date.issued.fl_str_mv |
2020-06-08 |
dc.date.accessioned.fl_str_mv |
2021-12-15T19:31:43Z |
dc.date.available.fl_str_mv |
2021-12-15T19:31:43Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SANTOS, Marcos Alves dos. Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D). 2020. 102 f. Tese (Engenharia de Materiais e Nanotecnologia) - Universidade Presbiteriana Mackenzie, São Paulo, 2020. |
dc.identifier.uri.fl_str_mv |
https://dspace.mackenzie.br/handle/10899/28440 |
identifier_str_mv |
SANTOS, Marcos Alves dos. Desenvolvimento de uma ferramenta analítica para purificação de dispersões de materiais bidimensionais (2D). 2020. 102 f. Tese (Engenharia de Materiais e Nanotecnologia) - Universidade Presbiteriana Mackenzie, São Paulo, 2020. |
url |
https://dspace.mackenzie.br/handle/10899/28440 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
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application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Presbiteriana Mackenzie |
dc.publisher.program.fl_str_mv |
Engenharia de Materiais e Nanotecnologia |
dc.publisher.initials.fl_str_mv |
UPM |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Escola de Engenharia Mackenzie (EE) |
publisher.none.fl_str_mv |
Universidade Presbiteriana Mackenzie |
dc.source.none.fl_str_mv |
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Universidade Presbiteriana Mackenzie (MACKENZIE) |
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MACKENZIE |
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MACKENZIE |
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Biblioteca Digital de Teses e Dissertações do Mackenzie |
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