Effect of acid hydrolysis conditions on the degradation properties of cellulose from Imperata brasiliensis fibers
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.proeng.2017.07.035 http://hdl.handle.net/11449/170527 |
Resumo: | The thermal properties of Imperata brasiliensis fibers and cellulose nanofibrils (CNFs), obtained at different conditions of sulfuric acid hydrolysis, were studied in the present work. Imperata Brasiliensis fibers were chemically treated by alkaline solution followed by bleaching treatment and both, untreated and treated fibers were characterized. Using a design of experiments (DOE), CNFs were obtained at nine different conditions, considering four factors (acid concentration, pulp/solution ratio, temperature and reaction time), at three levels. From results of thermogravimetric analysis (TGA), it was possible to determine some degradation properties and kinetic parameters such as activation energy (Ea) and understand how this parameter changes as a function of chemical treatments and acid hydrolysis conditions. Considering obtained results, it was possible to stablished that chemical treatments, carried out before acid hydrolysis, were effective since some amorphous components were removed, which was confirmed by the increase of thermal stability and Ea values. The best conditions of acid hydrolysis to obtain CNFs from Imperata brasiliensis fibers was also determined, being H2SO4 64 (wt%) at 35C for 75 min with pulp/solution ratio of 1/20 (g/mL). The suspension obtained at these conditions presented initial degradation temperature of 117 C and, Ea for the main stage of cellulose degradation of about 64 kJ/mol. |
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Effect of acid hydrolysis conditions on the degradation properties of cellulose from Imperata brasiliensis fibersActivation energyImperata brasiliensis fibersThermal analysisThe thermal properties of Imperata brasiliensis fibers and cellulose nanofibrils (CNFs), obtained at different conditions of sulfuric acid hydrolysis, were studied in the present work. Imperata Brasiliensis fibers were chemically treated by alkaline solution followed by bleaching treatment and both, untreated and treated fibers were characterized. Using a design of experiments (DOE), CNFs were obtained at nine different conditions, considering four factors (acid concentration, pulp/solution ratio, temperature and reaction time), at three levels. From results of thermogravimetric analysis (TGA), it was possible to determine some degradation properties and kinetic parameters such as activation energy (Ea) and understand how this parameter changes as a function of chemical treatments and acid hydrolysis conditions. Considering obtained results, it was possible to stablished that chemical treatments, carried out before acid hydrolysis, were effective since some amorphous components were removed, which was confirmed by the increase of thermal stability and Ea values. The best conditions of acid hydrolysis to obtain CNFs from Imperata brasiliensis fibers was also determined, being H2SO4 64 (wt%) at 35C for 75 min with pulp/solution ratio of 1/20 (g/mL). The suspension obtained at these conditions presented initial degradation temperature of 117 C and, Ea for the main stage of cellulose degradation of about 64 kJ/mol.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Departament of Materials and Technology Unesp - São Paulo State University Ariberto Pereira da Cunha, 333, GauaratinguetáDepartament of Materials and Technology Unesp - São Paulo State University Ariberto Pereira da Cunha, 333, GauaratinguetáFAPESP: 2011/14153-8Universidade Estadual Paulista (Unesp)De Carvalho Benini, Kelly C.C. [UNESP]Pereira, Paulo H.F. [UNESP]Cioffi, Maria Odila H. [UNESP]Cornelis Voorwald, Herman Jacobus [UNESP]2018-12-11T16:51:12Z2018-12-11T16:51:12Z2017-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObject244-251http://dx.doi.org/10.1016/j.proeng.2017.07.035Procedia Engineering, v. 200, p. 244-251.1877-7058http://hdl.handle.net/11449/17052710.1016/j.proeng.2017.07.0352-s2.0-85040002898Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengProcedia Engineering0,282info:eu-repo/semantics/openAccess2021-10-23T21:44:22Zoai:repositorio.unesp.br:11449/170527Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T21:44:22Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Effect of acid hydrolysis conditions on the degradation properties of cellulose from Imperata brasiliensis fibers |
title |
Effect of acid hydrolysis conditions on the degradation properties of cellulose from Imperata brasiliensis fibers |
spellingShingle |
Effect of acid hydrolysis conditions on the degradation properties of cellulose from Imperata brasiliensis fibers De Carvalho Benini, Kelly C.C. [UNESP] Activation energy Imperata brasiliensis fibers Thermal analysis |
title_short |
Effect of acid hydrolysis conditions on the degradation properties of cellulose from Imperata brasiliensis fibers |
title_full |
Effect of acid hydrolysis conditions on the degradation properties of cellulose from Imperata brasiliensis fibers |
title_fullStr |
Effect of acid hydrolysis conditions on the degradation properties of cellulose from Imperata brasiliensis fibers |
title_full_unstemmed |
Effect of acid hydrolysis conditions on the degradation properties of cellulose from Imperata brasiliensis fibers |
title_sort |
Effect of acid hydrolysis conditions on the degradation properties of cellulose from Imperata brasiliensis fibers |
author |
De Carvalho Benini, Kelly C.C. [UNESP] |
author_facet |
De Carvalho Benini, Kelly C.C. [UNESP] Pereira, Paulo H.F. [UNESP] Cioffi, Maria Odila H. [UNESP] Cornelis Voorwald, Herman Jacobus [UNESP] |
author_role |
author |
author2 |
Pereira, Paulo H.F. [UNESP] Cioffi, Maria Odila H. [UNESP] Cornelis Voorwald, Herman Jacobus [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
De Carvalho Benini, Kelly C.C. [UNESP] Pereira, Paulo H.F. [UNESP] Cioffi, Maria Odila H. [UNESP] Cornelis Voorwald, Herman Jacobus [UNESP] |
dc.subject.por.fl_str_mv |
Activation energy Imperata brasiliensis fibers Thermal analysis |
topic |
Activation energy Imperata brasiliensis fibers Thermal analysis |
description |
The thermal properties of Imperata brasiliensis fibers and cellulose nanofibrils (CNFs), obtained at different conditions of sulfuric acid hydrolysis, were studied in the present work. Imperata Brasiliensis fibers were chemically treated by alkaline solution followed by bleaching treatment and both, untreated and treated fibers were characterized. Using a design of experiments (DOE), CNFs were obtained at nine different conditions, considering four factors (acid concentration, pulp/solution ratio, temperature and reaction time), at three levels. From results of thermogravimetric analysis (TGA), it was possible to determine some degradation properties and kinetic parameters such as activation energy (Ea) and understand how this parameter changes as a function of chemical treatments and acid hydrolysis conditions. Considering obtained results, it was possible to stablished that chemical treatments, carried out before acid hydrolysis, were effective since some amorphous components were removed, which was confirmed by the increase of thermal stability and Ea values. The best conditions of acid hydrolysis to obtain CNFs from Imperata brasiliensis fibers was also determined, being H2SO4 64 (wt%) at 35C for 75 min with pulp/solution ratio of 1/20 (g/mL). The suspension obtained at these conditions presented initial degradation temperature of 117 C and, Ea for the main stage of cellulose degradation of about 64 kJ/mol. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-01-01 2018-12-11T16:51:12Z 2018-12-11T16:51:12Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.proeng.2017.07.035 Procedia Engineering, v. 200, p. 244-251. 1877-7058 http://hdl.handle.net/11449/170527 10.1016/j.proeng.2017.07.035 2-s2.0-85040002898 |
url |
http://dx.doi.org/10.1016/j.proeng.2017.07.035 http://hdl.handle.net/11449/170527 |
identifier_str_mv |
Procedia Engineering, v. 200, p. 244-251. 1877-7058 10.1016/j.proeng.2017.07.035 2-s2.0-85040002898 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Procedia Engineering 0,282 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
244-251 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1803650044737355776 |