Evaluation of the adsorption capacity of a new cellulose-based polymer
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10362/84553 |
Resumo: | A novel cellulose-based polymer, dicarboxymethyl cellulose (DCMC), was synthesized from cellulose and sodium 2-bromomalonate. Inductively coupled plasma atomic emission spectrometry (ICP-AES) and Fourier-transform infrared spectroscopy (FTIR) were employed to characterize the polymer. The size of the particles ranged between 10 and 100 µm. Equilibrium and kinetic adsorption studies were performed to evaluate its suitability for methylene blue removal at different pH. Equilibrium adsorption data was analyzed using Langmuir and Freundlich isotherms. At pH = 3, adsorption isotherms followed the Langmuir model with a maximum adsorption capacity of 887.6 mg/g. At pH = 6.4, the adsorption isotherms produced an S-shape and were fitted with the Sips model, giving a maximum uptake of 1354.6 mg/g. Pseudo second-order kinetic model provided the best fit of the experimental data. The reusability of DCMC was evaluated. After the first cycle, adsorption decreased 30%. Adsorption coupled with membrane filtration allowed complete removal. The adsorption of cytochrome C was evaluated. The adsorption process followed the Langmuir adsorption isotherm, giving a maximum uptake of 1279.6 mg/g. Pseudo second-order kinetic model adjusted well the experimental data. DCMC was successfully regenerated and reused without compromising performance. After three cycles, adsorption efficiency was above 90%. |
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Evaluation of the adsorption capacity of a new cellulose-based polymerAdsorption isothermsAdsorption kineticsDicarboxymethyl celluloseDye removalLow-cost adsorbentsProtein purificationDomínio/Área Científica::Engenharia e Tecnologia::Engenharia QuímicaA novel cellulose-based polymer, dicarboxymethyl cellulose (DCMC), was synthesized from cellulose and sodium 2-bromomalonate. Inductively coupled plasma atomic emission spectrometry (ICP-AES) and Fourier-transform infrared spectroscopy (FTIR) were employed to characterize the polymer. The size of the particles ranged between 10 and 100 µm. Equilibrium and kinetic adsorption studies were performed to evaluate its suitability for methylene blue removal at different pH. Equilibrium adsorption data was analyzed using Langmuir and Freundlich isotherms. At pH = 3, adsorption isotherms followed the Langmuir model with a maximum adsorption capacity of 887.6 mg/g. At pH = 6.4, the adsorption isotherms produced an S-shape and were fitted with the Sips model, giving a maximum uptake of 1354.6 mg/g. Pseudo second-order kinetic model provided the best fit of the experimental data. The reusability of DCMC was evaluated. After the first cycle, adsorption decreased 30%. Adsorption coupled with membrane filtration allowed complete removal. The adsorption of cytochrome C was evaluated. The adsorption process followed the Langmuir adsorption isotherm, giving a maximum uptake of 1279.6 mg/g. Pseudo second-order kinetic model adjusted well the experimental data. DCMC was successfully regenerated and reused without compromising performance. After three cycles, adsorption efficiency was above 90%.Coelhoso, IsabelChagas, RicardoRUNGago, Diana Xavier Cardoso Torres2020-10-31T01:30:45Z2019-10-1020192019-10-10T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/84553enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T04:37:42Zoai:run.unl.pt:10362/84553Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:36:30.286752Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Evaluation of the adsorption capacity of a new cellulose-based polymer |
title |
Evaluation of the adsorption capacity of a new cellulose-based polymer |
spellingShingle |
Evaluation of the adsorption capacity of a new cellulose-based polymer Gago, Diana Xavier Cardoso Torres Adsorption isotherms Adsorption kinetics Dicarboxymethyl cellulose Dye removal Low-cost adsorbents Protein purification Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química |
title_short |
Evaluation of the adsorption capacity of a new cellulose-based polymer |
title_full |
Evaluation of the adsorption capacity of a new cellulose-based polymer |
title_fullStr |
Evaluation of the adsorption capacity of a new cellulose-based polymer |
title_full_unstemmed |
Evaluation of the adsorption capacity of a new cellulose-based polymer |
title_sort |
Evaluation of the adsorption capacity of a new cellulose-based polymer |
author |
Gago, Diana Xavier Cardoso Torres |
author_facet |
Gago, Diana Xavier Cardoso Torres |
author_role |
author |
dc.contributor.none.fl_str_mv |
Coelhoso, Isabel Chagas, Ricardo RUN |
dc.contributor.author.fl_str_mv |
Gago, Diana Xavier Cardoso Torres |
dc.subject.por.fl_str_mv |
Adsorption isotherms Adsorption kinetics Dicarboxymethyl cellulose Dye removal Low-cost adsorbents Protein purification Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química |
topic |
Adsorption isotherms Adsorption kinetics Dicarboxymethyl cellulose Dye removal Low-cost adsorbents Protein purification Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Química |
description |
A novel cellulose-based polymer, dicarboxymethyl cellulose (DCMC), was synthesized from cellulose and sodium 2-bromomalonate. Inductively coupled plasma atomic emission spectrometry (ICP-AES) and Fourier-transform infrared spectroscopy (FTIR) were employed to characterize the polymer. The size of the particles ranged between 10 and 100 µm. Equilibrium and kinetic adsorption studies were performed to evaluate its suitability for methylene blue removal at different pH. Equilibrium adsorption data was analyzed using Langmuir and Freundlich isotherms. At pH = 3, adsorption isotherms followed the Langmuir model with a maximum adsorption capacity of 887.6 mg/g. At pH = 6.4, the adsorption isotherms produced an S-shape and were fitted with the Sips model, giving a maximum uptake of 1354.6 mg/g. Pseudo second-order kinetic model provided the best fit of the experimental data. The reusability of DCMC was evaluated. After the first cycle, adsorption decreased 30%. Adsorption coupled with membrane filtration allowed complete removal. The adsorption of cytochrome C was evaluated. The adsorption process followed the Langmuir adsorption isotherm, giving a maximum uptake of 1279.6 mg/g. Pseudo second-order kinetic model adjusted well the experimental data. DCMC was successfully regenerated and reused without compromising performance. After three cycles, adsorption efficiency was above 90%. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-10 2019 2019-10-10T00:00:00Z 2020-10-31T01:30:45Z |
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://hdl.handle.net/10362/84553 |
url |
http://hdl.handle.net/10362/84553 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799137983384780800 |