Desenvolvimento de materiais a base de quitina para aplicação na adsorção de corantes
Ano de defesa: | 2021 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , , , |
Tipo de documento: | Tese |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
Centro de Tecnologia |
Programa de Pós-Graduação: |
Programa de Pós-Graduação em Engenharia Química
|
Departamento: |
Engenharia Química
|
País: |
Brasil
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/23238 |
Resumo: | The environmental problems due to the accelerated industrialization of the last decades have caused in society the need to develop new technologies for the treatment of industrial waste. The textile industry stands out due to the high consumption of water in its production process and the large volumes of effluents generated containing contaminating compounds, such as dyes, with great potential for the pollution of water bodies. As result, an extensive research has been carried out to develop technologies for the treatment of effluents containing dyes, among which adsorption stands out for its low cost and high efficiency. Chitin is a biodegradable and renewable biopolymer that can be used as a basis for the development of adsorbent materials. In this context, the present work aimed to develop materials from chitin for application in the removal of crystal violet dye from aqueous solutions by adsorption. First, chitin was obtained from shrimp residues, and by acid hydrolysis of the obtained chitin, nanowhiskers were synthesized. Both materials were characterized and applied for adsorption studies. The characterization of the materials showed that the nanowhiskers had a rod shape and a larger average pore size when compared to chitin. The adsorption tests showed that the adsorption was favored using 5 g L-1 of nanowhiskers and solution with a pH of 8. The pseudo-second order model was the most adequate to represent the kinetic data and the Sips model the best represented the equilibrium curves. The process was endothermic, spontaneous and favorable. The maximum adsorption capacity of crystal violet was 59.52 mg g-1, which corroborated the potential of nanowhiskers to be used as an adsorbent in the treatment of colored effluents. A new aerogel was also synthesized from chitin. This aerogel was obtained by the freeze-drying of a gel of chitin and psyllium. The developed material was characterized and applied for adsorption studies. The characterization showed that the aerogel has a typical structure of amorphous materials with a porous and randomly interconnected structure that resembles an open pore network. The adsorption was favored using 2.5 g L-1 of aerogel and solutions with a pH of 8. The pseudo-second order and Freundlich models satisfactorily described the kinetic and equilibrium data, respectively. The maximum adsorption capacity of crystal violet was 227.11 mg g-1, which indicates that aerogel is very efficient and competitive with several other adsorbents described in the literature for removing crystal violet from aqueous solutions. Tests using aerogel to treat simulated textile effluents showed that this material has great potential to treat real colored effluents. In summary, it can be concluded that the development of adsorbents from chitin contributes strongly to research on the development of technologies for the treatment of effluents containing dyes. |
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2021-12-10T17:06:45Z2021-12-10T17:06:45Z2021-02-24http://repositorio.ufsm.br/handle/1/23238The environmental problems due to the accelerated industrialization of the last decades have caused in society the need to develop new technologies for the treatment of industrial waste. The textile industry stands out due to the high consumption of water in its production process and the large volumes of effluents generated containing contaminating compounds, such as dyes, with great potential for the pollution of water bodies. As result, an extensive research has been carried out to develop technologies for the treatment of effluents containing dyes, among which adsorption stands out for its low cost and high efficiency. Chitin is a biodegradable and renewable biopolymer that can be used as a basis for the development of adsorbent materials. In this context, the present work aimed to develop materials from chitin for application in the removal of crystal violet dye from aqueous solutions by adsorption. First, chitin was obtained from shrimp residues, and by acid hydrolysis of the obtained chitin, nanowhiskers were synthesized. Both materials were characterized and applied for adsorption studies. The characterization of the materials showed that the nanowhiskers had a rod shape and a larger average pore size when compared to chitin. The adsorption tests showed that the adsorption was favored using 5 g L-1 of nanowhiskers and solution with a pH of 8. The pseudo-second order model was the most adequate to represent the kinetic data and the Sips model the best represented the equilibrium curves. The process was endothermic, spontaneous and favorable. The maximum adsorption capacity of crystal violet was 59.52 mg g-1, which corroborated the potential of nanowhiskers to be used as an adsorbent in the treatment of colored effluents. A new aerogel was also synthesized from chitin. This aerogel was obtained by the freeze-drying of a gel of chitin and psyllium. The developed material was characterized and applied for adsorption studies. The characterization showed that the aerogel has a typical structure of amorphous materials with a porous and randomly interconnected structure that resembles an open pore network. The adsorption was favored using 2.5 g L-1 of aerogel and solutions with a pH of 8. The pseudo-second order and Freundlich models satisfactorily described the kinetic and equilibrium data, respectively. The maximum adsorption capacity of crystal violet was 227.11 mg g-1, which indicates that aerogel is very efficient and competitive with several other adsorbents described in the literature for removing crystal violet from aqueous solutions. Tests using aerogel to treat simulated textile effluents showed that this material has great potential to treat real colored effluents. In summary, it can be concluded that the development of adsorbents from chitin contributes strongly to research on the development of technologies for the treatment of effluents containing dyes.Os problemas ambientais em virtude da industrialização acelerada das últimas décadas têm despertado na sociedade a necessidade de desenvolvimento de novas tecnologias para o tratamento dos resíduos industriais. A indústria têxtil se destaca devido ao alto consumo de água no seu processo produtivo e aos grandes volumes de efluentes gerados contendo compostos contaminantes, como corantes, com grande potencial para a poluição de corpos d`água. Em função disso, uma extensa pesquisa vem sendo realizada visando o desenvolvimento de tecnologias para o tratamento de efluentes contendo corantes, dentre as quais a adsorção se destaca por seu baixo custo e alta eficiência. A quitina é um biopolímero biodegradável e renovável que pode ser utilizado como base para o desenvolvimento de materiais adsorventes. Nesse contexto, o presente trabalho teve como objetivo desenvolver materiais a partir da quitina para aplicação na remoção do corante violeta cristal de soluções aquosas por adsorção. Primeiramente, quitina foi obtida a partir de resíduos de camarão, e através da hidrólise ácida da quitina obtida, nanowhiskers foram sintetizados. Ambos os materiais foram caracterizados e aplicados para estudos de adsorção. A caracterização dos materiais mostrou que os nanowhiskers apresentaram forma de haste e um maior tamanho médio de poros quando comparada a quitina. Os testes de adsorção mostraram que a adsorção foi favorecida utilizando-se 5 g L-1 de nanowhiskers e pH da solução igual a 8. O modelo de pseudossegunda ordem foi o mais adequado para representar os dados cinéticos e o modelo de Sips o que melhor representou as curvas de equilíbrio. O processo foi endotérmico, espontâneo e favorável. A capacidade máxima de adsorção do violeta cristal foi 59,52 mg g-1, o que corroborou o potencial dos nanowhiskers para ser utilizado como adsorvente no tratamento de efluentes coloridos. Um novo aerogel também foi sintetizado a partir da quitina. Este aerogel foi obtido pela criodessecação de um gel de quitina e psyllium. O material desenvolvido foi caracterizado e aplicado para estudos de adsorção. A caracterização mostrou que o aerogel apresenta uma estrutura típica de materiais amorfos com uma estrutura porosa e interconectada aleatoriamente que se assemelha a uma rede de poros abertos. A adsorção foi favorecida utilizando-se 2,5 g L-1 de aerogel e pH da solução igual a 8. Os modelos de pseudossegunda ordem e Freundlich descreveram satisfatoriamente os dados cinéticos e de equilíbrio, respectivamente. A capacidade máxima de adsorção do violeta cristal foi 227,11 mg g-1, o que indica que o aerogel é muito eficiente e competitivo com diversos outros adsorventes descritos na literatura para remover violeta cristal de soluções aquosas. Os testes utilizando aerogel para tratar efluente têxtil simulado mostraram que este material tem grande potencial para tratar efluentes coloridos reais. Em síntese, pode-se concluir que o desenvolvimento de adsorventes a partir da quitina contribui fortemente para as pesquisas sobre desenvolvimento de tecnologias para o tratamento de efluentes contendo corantes.porUniversidade Federal de Santa MariaCentro de TecnologiaPrograma de Pós-Graduação em Engenharia QuímicaUFSMBrasilEngenharia QuímicaAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessAdsorçãoQuitinaVioleta cristalNanowhiskersAerogelAdsorptionChitinCrystal violetCNPQ::ENGENHARIAS::ENGENHARIA QUIMICADesenvolvimento de materiais a base de quitina para aplicação na adsorção de corantesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisDotto, Guilherme Luizhttp://lattes.cnpq.br/5412544199323879Severo, Eric da CruzCollazzo, Gabriela CarvalhoZazycki, Maria AméliaCastilhos, Fernanda dehttp://lattes.cnpq.br/7093489505021410Druzian, Susanne Pedroso300600000006600600600600600d27c00eb-4f6c-4070-b566-60f99dd556586fd842d8-d7f8-42fe-9ae5-31762a6511d4b29d74a8-6262-488d-9f8e-312ee1a6293e9d9e4575-bd2b-41d2-832d-dcadd54ba0c27b738979-a98a-46a1-8ee2-3dae234bed81625c57d8-c817-4665-bfaa-15ebc9991f73reponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALTES_PPGEQ_2021_DRUZIAN_SUSANNE.pdfTES_PPGEQ_2021_DRUZIAN_SUSANNE.pdfTese de Doutoradoapplication/pdf5977044http://repositorio.ufsm.br/bitstream/1/23238/1/TES_PPGEQ_2021_DRUZIAN_SUSANNE.pdf2ed0adfadcde1737d269dfdab5c90ec2MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8805http://repositorio.ufsm.br/bitstream/1/23238/2/license_rdf4460e5956bc1d1639be9ae6146a50347MD52LICENSElicense.txtlicense.txttext/plain; charset=utf-816http://repositorio.ufsm.br/bitstream/1/23238/3/license.txtf8fcb28efb1c8cf0dc096bec902bf4c4MD53TEXTTES_PPGEQ_2021_DRUZIAN_SUSANNE.pdf.txtTES_PPGEQ_2021_DRUZIAN_SUSANNE.pdf.txtExtracted texttext/plain177424http://repositorio.ufsm.br/bitstream/1/23238/4/TES_PPGEQ_2021_DRUZIAN_SUSANNE.pdf.txt92f9e166c3551d25b3ee52a7494ee59dMD54THUMBNAILTES_PPGEQ_2021_DRUZIAN_SUSANNE.pdf.jpgTES_PPGEQ_2021_DRUZIAN_SUSANNE.pdf.jpgIM Thumbnailimage/jpeg4391http://repositorio.ufsm.br/bitstream/1/23238/5/TES_PPGEQ_2021_DRUZIAN_SUSANNE.pdf.jpgf3e7a9b988994c93f7190dc40798ed68MD551/232382021-12-30 09:25:34.41oai:repositorio.ufsm.br:1/23238Q3JlYXRpdmUgQ29tbW9ucw==Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2021-12-30T12:25:34Biblioteca Digital de Teses e Dissertações do UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Desenvolvimento de materiais a base de quitina para aplicação na adsorção de corantes |
title |
Desenvolvimento de materiais a base de quitina para aplicação na adsorção de corantes |
spellingShingle |
Desenvolvimento de materiais a base de quitina para aplicação na adsorção de corantes Druzian, Susanne Pedroso Adsorção Quitina Violeta cristal Nanowhiskers Aerogel Adsorption Chitin Crystal violet CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA |
title_short |
Desenvolvimento de materiais a base de quitina para aplicação na adsorção de corantes |
title_full |
Desenvolvimento de materiais a base de quitina para aplicação na adsorção de corantes |
title_fullStr |
Desenvolvimento de materiais a base de quitina para aplicação na adsorção de corantes |
title_full_unstemmed |
Desenvolvimento de materiais a base de quitina para aplicação na adsorção de corantes |
title_sort |
Desenvolvimento de materiais a base de quitina para aplicação na adsorção de corantes |
author |
Druzian, Susanne Pedroso |
author_facet |
Druzian, Susanne Pedroso |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Dotto, Guilherme Luiz |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/5412544199323879 |
dc.contributor.referee1.fl_str_mv |
Severo, Eric da Cruz |
dc.contributor.referee2.fl_str_mv |
Collazzo, Gabriela Carvalho |
dc.contributor.referee3.fl_str_mv |
Zazycki, Maria Amélia |
dc.contributor.referee4.fl_str_mv |
Castilhos, Fernanda de |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/7093489505021410 |
dc.contributor.author.fl_str_mv |
Druzian, Susanne Pedroso |
contributor_str_mv |
Dotto, Guilherme Luiz Severo, Eric da Cruz Collazzo, Gabriela Carvalho Zazycki, Maria Amélia Castilhos, Fernanda de |
dc.subject.por.fl_str_mv |
Adsorção Quitina Violeta cristal Nanowhiskers Aerogel |
topic |
Adsorção Quitina Violeta cristal Nanowhiskers Aerogel Adsorption Chitin Crystal violet CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA |
dc.subject.eng.fl_str_mv |
Adsorption Chitin Crystal violet |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA |
description |
The environmental problems due to the accelerated industrialization of the last decades have caused in society the need to develop new technologies for the treatment of industrial waste. The textile industry stands out due to the high consumption of water in its production process and the large volumes of effluents generated containing contaminating compounds, such as dyes, with great potential for the pollution of water bodies. As result, an extensive research has been carried out to develop technologies for the treatment of effluents containing dyes, among which adsorption stands out for its low cost and high efficiency. Chitin is a biodegradable and renewable biopolymer that can be used as a basis for the development of adsorbent materials. In this context, the present work aimed to develop materials from chitin for application in the removal of crystal violet dye from aqueous solutions by adsorption. First, chitin was obtained from shrimp residues, and by acid hydrolysis of the obtained chitin, nanowhiskers were synthesized. Both materials were characterized and applied for adsorption studies. The characterization of the materials showed that the nanowhiskers had a rod shape and a larger average pore size when compared to chitin. The adsorption tests showed that the adsorption was favored using 5 g L-1 of nanowhiskers and solution with a pH of 8. The pseudo-second order model was the most adequate to represent the kinetic data and the Sips model the best represented the equilibrium curves. The process was endothermic, spontaneous and favorable. The maximum adsorption capacity of crystal violet was 59.52 mg g-1, which corroborated the potential of nanowhiskers to be used as an adsorbent in the treatment of colored effluents. A new aerogel was also synthesized from chitin. This aerogel was obtained by the freeze-drying of a gel of chitin and psyllium. The developed material was characterized and applied for adsorption studies. The characterization showed that the aerogel has a typical structure of amorphous materials with a porous and randomly interconnected structure that resembles an open pore network. The adsorption was favored using 2.5 g L-1 of aerogel and solutions with a pH of 8. The pseudo-second order and Freundlich models satisfactorily described the kinetic and equilibrium data, respectively. The maximum adsorption capacity of crystal violet was 227.11 mg g-1, which indicates that aerogel is very efficient and competitive with several other adsorbents described in the literature for removing crystal violet from aqueous solutions. Tests using aerogel to treat simulated textile effluents showed that this material has great potential to treat real colored effluents. In summary, it can be concluded that the development of adsorbents from chitin contributes strongly to research on the development of technologies for the treatment of effluents containing dyes. |
publishDate |
2021 |
dc.date.accessioned.fl_str_mv |
2021-12-10T17:06:45Z |
dc.date.available.fl_str_mv |
2021-12-10T17:06:45Z |
dc.date.issued.fl_str_mv |
2021-02-24 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/doctoralThesis |
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doctoralThesis |
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http://repositorio.ufsm.br/handle/1/23238 |
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por |
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300600000006 |
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600 600 600 600 600 |
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openAccess |
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Universidade Federal de Santa Maria Centro de Tecnologia |
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Programa de Pós-Graduação em Engenharia Química |
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UFSM |
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Brasil |
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Engenharia Química |
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Universidade Federal de Santa Maria Centro de Tecnologia |
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