Desenvolvimento de nanofibras a partir de polímeros reciclados para remoção de metais pesados
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/30240 |
Resumo: | Contamination of water resources by heavy metals and the increasing generation of polymeric waste are aggravating problems in modern society, capable of causing diverse and severe impacts on the environment and human health. Thus, alternatives for the removal of heavy metals from aqueous media and ways to reuse polymeric waste are crucial. This work covers two articles produced on the development of modified polymeric nanofibers for the removal of heavy metals from aqueous solutions. In the first article, recycled expanded polystyrene (EPS) nanofibers were produced using the centrifugal spinning method, followed by modification with chitosan (CS), generating nanofibers called EPS/CS. EPS/CS nanofibers were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR). The results of the characterizations showed that the EPS/CS nanofibers had an average diameter of 806 nm, in addition to important functional groups in the adsorption of lead(II). Lead(II) adsorption experiments were performed with these nanofibers, including pH effect, adsorption kinetics, equilibrium isotherms and regeneration tests. The results showed that increasing the pH to 6 favored the removal of lead(II). The pseudo-second order model best fitted the kinetic data, while the AranovichDonohue model best described the equilibrium data, with the nanofibers presenting a maximum adsorption capacity of 137,35 mg g-1 . Thermodynamic parameters indicated a spontaneous, favorable, and endothermic process. After four cycles, the nanofibers maintained 63,04% of their original adsorption capacity. In another article discussed in this work, recycled polyethylene terephthalate (PET) nanofibers were modified with tannin (TN) using the centrifugal spinning method, generating nanofibers called PET/TN. After a crosslinking step with glutaraldehyde, the PET/TN nanofibers were also characterized by SEM, TGA and FTIR. The characterization results showed that the PET/TN nanofibers had an average diameter of 188 nm, in addition to functional groups that were crucial for lead(II) adsorption. Lead(II) adsorption experiments were also performed with these nanofibers, including pH effect, adsorption kinetics, equilibrium isotherms, and regeneration tests. The results showed that increasing the pH to 6 favored the removal of lead(II). The pseudo-first order model best fitted the kinetic data, while the Sips model best described the equilibrium data, with the nanofibers presenting a maximum adsorption capacity of 350,81 mg g-1 . Thermodynamic parameters indicated a spontaneous, favorable, and endothermic process. After four cycles, the nanofibers maintained 45.20% of their original adsorption capacity. The results of both articles point to recycled polymer nanofibers as excellent alternatives to heavy metal adsorption, in addition to reducing the disposal of polymeric waste in the environment, generating aggregated value nanomaterials. |
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Desenvolvimento de nanofibras a partir de polímeros reciclados para remoção de metais pesadosDevelopment of nanofibers from recycled polymers for the removal of heavy metalsNanofibrasPolímeros recicladosAdsorçãoQuitosanaTaninoNanofibersRecycled polymersAdsorptionChitosanTanninCNPQ::ENGENHARIAS::ENGENHARIA QUIMICAContamination of water resources by heavy metals and the increasing generation of polymeric waste are aggravating problems in modern society, capable of causing diverse and severe impacts on the environment and human health. Thus, alternatives for the removal of heavy metals from aqueous media and ways to reuse polymeric waste are crucial. This work covers two articles produced on the development of modified polymeric nanofibers for the removal of heavy metals from aqueous solutions. In the first article, recycled expanded polystyrene (EPS) nanofibers were produced using the centrifugal spinning method, followed by modification with chitosan (CS), generating nanofibers called EPS/CS. EPS/CS nanofibers were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR). The results of the characterizations showed that the EPS/CS nanofibers had an average diameter of 806 nm, in addition to important functional groups in the adsorption of lead(II). Lead(II) adsorption experiments were performed with these nanofibers, including pH effect, adsorption kinetics, equilibrium isotherms and regeneration tests. The results showed that increasing the pH to 6 favored the removal of lead(II). The pseudo-second order model best fitted the kinetic data, while the AranovichDonohue model best described the equilibrium data, with the nanofibers presenting a maximum adsorption capacity of 137,35 mg g-1 . Thermodynamic parameters indicated a spontaneous, favorable, and endothermic process. After four cycles, the nanofibers maintained 63,04% of their original adsorption capacity. In another article discussed in this work, recycled polyethylene terephthalate (PET) nanofibers were modified with tannin (TN) using the centrifugal spinning method, generating nanofibers called PET/TN. After a crosslinking step with glutaraldehyde, the PET/TN nanofibers were also characterized by SEM, TGA and FTIR. The characterization results showed that the PET/TN nanofibers had an average diameter of 188 nm, in addition to functional groups that were crucial for lead(II) adsorption. Lead(II) adsorption experiments were also performed with these nanofibers, including pH effect, adsorption kinetics, equilibrium isotherms, and regeneration tests. The results showed that increasing the pH to 6 favored the removal of lead(II). The pseudo-first order model best fitted the kinetic data, while the Sips model best described the equilibrium data, with the nanofibers presenting a maximum adsorption capacity of 350,81 mg g-1 . Thermodynamic parameters indicated a spontaneous, favorable, and endothermic process. After four cycles, the nanofibers maintained 45.20% of their original adsorption capacity. The results of both articles point to recycled polymer nanofibers as excellent alternatives to heavy metal adsorption, in addition to reducing the disposal of polymeric waste in the environment, generating aggregated value nanomaterials.Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqA contaminação de recursos hídricos por metais pesados e a vasta geração de resíduos poliméricos são problemas agravantes da sociedade atual, capazes de causar impactos diversos e severos para o meio ambiente e a saúde humana. Desta forma, alternativas de remoção de metais pesados de meios aquosos e formas de reaproveitar os resíduos poliméricos possuem grande importância. Este trabalho abrange dois artigos produzidos sobre o desenvolvimento de nanofibras poliméricas modificadas para remoção de metais pesados de soluções aquosas. No primeiro artigo, nanofibras de poliestireno expandido (EPS) reciclado foram produzidas a partir do método de centrifugal spinning e modificadas com quitosana (CS), gerando nanofibras denominadas EPS/CS. As nanofibras de EPS/CS foram caracterizadas por microscopia eletrônica de varredura (MEV), análise termogravimétrica (TGA) e espectroscopia de infravermelho por transformada de Fourier (FTIR). Os resultados das caracterizações apontaram que as nanofibras EPS/CS apresentaram diâmetro médio de 806 nm além de grupos funcionais importantes na adsorção de chumbo(II). Experimentos de adsorção de chumbo(II) foram realizados com estas nanofibras, incluindo efeito do pH, cinética de adsorção, isotermas de equilíbrio e testes de regeneração. Os resultados apontaram que o aumento de pH até 6 favoreceu a remoção de chumbo(II). O modelo de pseudo-segunda ordem melhor se ajustou aos dados cinéticos, enquanto o modelo de Aranovich-Donohue melhor descreveu os dados de equilíbrio, com as nanofibras apresentando capacidade de adsorção máxima de 137,35 mg g-1. Os parâmetros termodinâmicos apontaram um processo espontâneo, favorável e endotérmico. Após quatro ciclos, as nanofibras mantiveram 63,04% de sua capacidade original de adsorção. No segundo artigo deste trabalho, nanofibras de polietileno tereftalato (PET) reciclado foram produzidas a partir do método de centrifugal spinning e modificadas com tanino (TN), gerando nanofibras denominadas PET/TN. Após uma etapa de crosslinking com glutaraldeído, as nanofibras de PET/TN foram também caracterizadas por MEV, TGA e FTIR. Os resultados das caracterizações apontaram que as nanofibras PET/TN apresentaram diâmetro médio de 188 nm além de grupos funcionais cruciais para adsorção de chumbo(II). Experimentos de adsorção de chumbo(II) também foram realizados com estas nanofibras, incluindo o efeito do pH, a cinética de adsorção, as isotermas de equilíbrio e os testes de regeneração. Os resultados apontaram que o aumento de pH até 6 favoreceu a remoção de chumbo(II). O modelo de pseudo-primeira ordem ajustou-se melhor aos dados cinéticos, enquanto o modelo de Sips descreveu de forma mais precisa os dados de equilíbrio, com as nanofibras apresentando capacidade de adsorção máxima de 350,81 mg g-1. Os parâmetros termodinâmicos apontaram um processo espontâneo, favorável e endotérmico. Após quatro ciclos, as nanofibras preservaram 45,20% de sua capacidade original de adsorção. Os resultados de ambos os artigos apontam as nanofibras de polímero reciclado como excelentes alternativas à adsorção de chumbo(II), além de reduzirem a disposição de resíduos poliméricos no meio ambiente gerando nanomateriais de alto valor agregado.Universidade Federal de Santa MariaBrasilEngenharia QuímicaUFSMPrograma de Pós-Graduação em Engenharia QuímicaCentro de TecnologiaTanabe, Eduardo Hiromitsuhttp://lattes.cnpq.br/9778700143605069Bertuol, Daniel AssumpçãoCancelier, AdrianoMissau, JulianoReisdörfer, GustavoAguiar, Mônica LopesMartins, Thiago Rodrigues2023-09-19T12:02:52Z2023-09-19T12:02:52Z2023-08-17info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfhttp://repositorio.ufsm.br/handle/1/30240porAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2023-09-19T12:02:52Zoai:repositorio.ufsm.br:1/30240Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2023-09-19T12:02:52Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Desenvolvimento de nanofibras a partir de polímeros reciclados para remoção de metais pesados Development of nanofibers from recycled polymers for the removal of heavy metals |
title |
Desenvolvimento de nanofibras a partir de polímeros reciclados para remoção de metais pesados |
spellingShingle |
Desenvolvimento de nanofibras a partir de polímeros reciclados para remoção de metais pesados Martins, Thiago Rodrigues Nanofibras Polímeros reciclados Adsorção Quitosana Tanino Nanofibers Recycled polymers Adsorption Chitosan Tannin CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA |
title_short |
Desenvolvimento de nanofibras a partir de polímeros reciclados para remoção de metais pesados |
title_full |
Desenvolvimento de nanofibras a partir de polímeros reciclados para remoção de metais pesados |
title_fullStr |
Desenvolvimento de nanofibras a partir de polímeros reciclados para remoção de metais pesados |
title_full_unstemmed |
Desenvolvimento de nanofibras a partir de polímeros reciclados para remoção de metais pesados |
title_sort |
Desenvolvimento de nanofibras a partir de polímeros reciclados para remoção de metais pesados |
author |
Martins, Thiago Rodrigues |
author_facet |
Martins, Thiago Rodrigues |
author_role |
author |
dc.contributor.none.fl_str_mv |
Tanabe, Eduardo Hiromitsu http://lattes.cnpq.br/9778700143605069 Bertuol, Daniel Assumpção Cancelier, Adriano Missau, Juliano Reisdörfer, Gustavo Aguiar, Mônica Lopes |
dc.contributor.author.fl_str_mv |
Martins, Thiago Rodrigues |
dc.subject.por.fl_str_mv |
Nanofibras Polímeros reciclados Adsorção Quitosana Tanino Nanofibers Recycled polymers Adsorption Chitosan Tannin CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA |
topic |
Nanofibras Polímeros reciclados Adsorção Quitosana Tanino Nanofibers Recycled polymers Adsorption Chitosan Tannin CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA |
description |
Contamination of water resources by heavy metals and the increasing generation of polymeric waste are aggravating problems in modern society, capable of causing diverse and severe impacts on the environment and human health. Thus, alternatives for the removal of heavy metals from aqueous media and ways to reuse polymeric waste are crucial. This work covers two articles produced on the development of modified polymeric nanofibers for the removal of heavy metals from aqueous solutions. In the first article, recycled expanded polystyrene (EPS) nanofibers were produced using the centrifugal spinning method, followed by modification with chitosan (CS), generating nanofibers called EPS/CS. EPS/CS nanofibers were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR). The results of the characterizations showed that the EPS/CS nanofibers had an average diameter of 806 nm, in addition to important functional groups in the adsorption of lead(II). Lead(II) adsorption experiments were performed with these nanofibers, including pH effect, adsorption kinetics, equilibrium isotherms and regeneration tests. The results showed that increasing the pH to 6 favored the removal of lead(II). The pseudo-second order model best fitted the kinetic data, while the AranovichDonohue model best described the equilibrium data, with the nanofibers presenting a maximum adsorption capacity of 137,35 mg g-1 . Thermodynamic parameters indicated a spontaneous, favorable, and endothermic process. After four cycles, the nanofibers maintained 63,04% of their original adsorption capacity. In another article discussed in this work, recycled polyethylene terephthalate (PET) nanofibers were modified with tannin (TN) using the centrifugal spinning method, generating nanofibers called PET/TN. After a crosslinking step with glutaraldehyde, the PET/TN nanofibers were also characterized by SEM, TGA and FTIR. The characterization results showed that the PET/TN nanofibers had an average diameter of 188 nm, in addition to functional groups that were crucial for lead(II) adsorption. Lead(II) adsorption experiments were also performed with these nanofibers, including pH effect, adsorption kinetics, equilibrium isotherms, and regeneration tests. The results showed that increasing the pH to 6 favored the removal of lead(II). The pseudo-first order model best fitted the kinetic data, while the Sips model best described the equilibrium data, with the nanofibers presenting a maximum adsorption capacity of 350,81 mg g-1 . Thermodynamic parameters indicated a spontaneous, favorable, and endothermic process. After four cycles, the nanofibers maintained 45.20% of their original adsorption capacity. The results of both articles point to recycled polymer nanofibers as excellent alternatives to heavy metal adsorption, in addition to reducing the disposal of polymeric waste in the environment, generating aggregated value nanomaterials. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-09-19T12:02:52Z 2023-09-19T12:02:52Z 2023-08-17 |
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.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/30240 |
url |
http://repositorio.ufsm.br/handle/1/30240 |
dc.language.iso.fl_str_mv |
por |
language |
por |
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.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Engenharia Química UFSM Programa de Pós-Graduação em Engenharia Química Centro de Tecnologia |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Engenharia Química UFSM Programa de Pós-Graduação em Engenharia Química Centro de Tecnologia |
dc.source.none.fl_str_mv |
reponame:Manancial - Repositório Digital da UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Manancial - Repositório Digital da UFSM |
collection |
Manancial - Repositório Digital da UFSM |
repository.name.fl_str_mv |
Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
atendimento.sib@ufsm.br||tedebc@gmail.com |
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1805922083497050112 |