Reoxidation of graphene oxide: Impact on the structure, chemical composition, morphology and dye adsorption properties
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.apsusc.2021.150774 http://hdl.handle.net/11449/222084 |
Resumo: | The chemical composition, oxidation degree, and sheet size strongly affect the properties of graphene oxide (GO). Therefore, much effort has been directed to improve the synthesis of GO and control its structure. Herein, we report the reoxidation of GO using milder conditions of a modified Hummers’ method, including shorter reaction times and a reduced proportion of chemicals to obtain the reoxidized GO (Ox-GO). The reoxidation impact was evaluated by studying the materials’ adsorption performance towards methylene blue (MB) and rhodamine B (RB). Compared to GO, Ox-GO presents a similar C/O ratio, increased interlayer spacing, smaller sheets with holes, a higher exfoliation degree, and slight differences in each oxygenated functional group. Our measurements evidence that Ox-GO has an MB adsorption capacity more than 30% higher than GO under different conditions of dye concentration and pH. Moreover, Ox-GO also shows a notable improvement in the RB removal for a high dye concentration, where the removal capacity is almost 40% higher than that of GO. The enhancements in the dyes’ removal are attributed to the increased accessible surface area of Ox-GO, which provides more sites for dyes’ adsorption. |
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Reoxidation of graphene oxide: Impact on the structure, chemical composition, morphology and dye adsorption propertiesCationic dyeGraphite oxidePair distribution functionTotal X-ray scatteringWater treatmentThe chemical composition, oxidation degree, and sheet size strongly affect the properties of graphene oxide (GO). Therefore, much effort has been directed to improve the synthesis of GO and control its structure. Herein, we report the reoxidation of GO using milder conditions of a modified Hummers’ method, including shorter reaction times and a reduced proportion of chemicals to obtain the reoxidized GO (Ox-GO). The reoxidation impact was evaluated by studying the materials’ adsorption performance towards methylene blue (MB) and rhodamine B (RB). Compared to GO, Ox-GO presents a similar C/O ratio, increased interlayer spacing, smaller sheets with holes, a higher exfoliation degree, and slight differences in each oxygenated functional group. Our measurements evidence that Ox-GO has an MB adsorption capacity more than 30% higher than GO under different conditions of dye concentration and pH. Moreover, Ox-GO also shows a notable improvement in the RB removal for a high dye concentration, where the removal capacity is almost 40% higher than that of GO. The enhancements in the dyes’ removal are attributed to the increased accessible surface area of Ox-GO, which provides more sites for dyes’ adsorption.Laboratory of Materials for Sustainability (LabMatSus) São Paulo State University (UNESP), Rua Cristóvão Colombo 2265Center for Information Technology Renato Archer (CTI), Rod. D. Pedro I, KM 143.6, 13069-901 CampinasDeutsches Elektronen-Synchrotron DESY, Notkestrasse 85Center for Hybrid Nanostructures (CHyN) Institute of Nanostructure and Solid State Physics University of Hamburg, Luruper Chaussee149Laboratory of Materials for Sustainability (LabMatSus) São Paulo State University (UNESP), Rua Cristóvão Colombo 2265Universidade Estadual Paulista (UNESP)Center for Information Technology Renato Archer (CTI)Deutsches Elektronen-Synchrotron DESYUniversity of HamburgZito, Cecilia A. [UNESP]Perfecto, Tarcísio M. [UNESP]Mazon, TalitaDippel, Ann-ChristinKoziej, DorotaVolanti, Diogo P. [UNESP]2022-04-28T19:42:14Z2022-04-28T19:42:14Z2021-11-30info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.apsusc.2021.150774Applied Surface Science, v. 567.0169-4332http://hdl.handle.net/11449/22208410.1016/j.apsusc.2021.1507742-s2.0-85111530648Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengApplied Surface Scienceinfo:eu-repo/semantics/openAccess2022-04-28T19:42:14Zoai:repositorio.unesp.br:11449/222084Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:27:12.589398Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Reoxidation of graphene oxide: Impact on the structure, chemical composition, morphology and dye adsorption properties |
title |
Reoxidation of graphene oxide: Impact on the structure, chemical composition, morphology and dye adsorption properties |
spellingShingle |
Reoxidation of graphene oxide: Impact on the structure, chemical composition, morphology and dye adsorption properties Zito, Cecilia A. [UNESP] Cationic dye Graphite oxide Pair distribution function Total X-ray scattering Water treatment |
title_short |
Reoxidation of graphene oxide: Impact on the structure, chemical composition, morphology and dye adsorption properties |
title_full |
Reoxidation of graphene oxide: Impact on the structure, chemical composition, morphology and dye adsorption properties |
title_fullStr |
Reoxidation of graphene oxide: Impact on the structure, chemical composition, morphology and dye adsorption properties |
title_full_unstemmed |
Reoxidation of graphene oxide: Impact on the structure, chemical composition, morphology and dye adsorption properties |
title_sort |
Reoxidation of graphene oxide: Impact on the structure, chemical composition, morphology and dye adsorption properties |
author |
Zito, Cecilia A. [UNESP] |
author_facet |
Zito, Cecilia A. [UNESP] Perfecto, Tarcísio M. [UNESP] Mazon, Talita Dippel, Ann-Christin Koziej, Dorota Volanti, Diogo P. [UNESP] |
author_role |
author |
author2 |
Perfecto, Tarcísio M. [UNESP] Mazon, Talita Dippel, Ann-Christin Koziej, Dorota Volanti, Diogo P. [UNESP] |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Center for Information Technology Renato Archer (CTI) Deutsches Elektronen-Synchrotron DESY University of Hamburg |
dc.contributor.author.fl_str_mv |
Zito, Cecilia A. [UNESP] Perfecto, Tarcísio M. [UNESP] Mazon, Talita Dippel, Ann-Christin Koziej, Dorota Volanti, Diogo P. [UNESP] |
dc.subject.por.fl_str_mv |
Cationic dye Graphite oxide Pair distribution function Total X-ray scattering Water treatment |
topic |
Cationic dye Graphite oxide Pair distribution function Total X-ray scattering Water treatment |
description |
The chemical composition, oxidation degree, and sheet size strongly affect the properties of graphene oxide (GO). Therefore, much effort has been directed to improve the synthesis of GO and control its structure. Herein, we report the reoxidation of GO using milder conditions of a modified Hummers’ method, including shorter reaction times and a reduced proportion of chemicals to obtain the reoxidized GO (Ox-GO). The reoxidation impact was evaluated by studying the materials’ adsorption performance towards methylene blue (MB) and rhodamine B (RB). Compared to GO, Ox-GO presents a similar C/O ratio, increased interlayer spacing, smaller sheets with holes, a higher exfoliation degree, and slight differences in each oxygenated functional group. Our measurements evidence that Ox-GO has an MB adsorption capacity more than 30% higher than GO under different conditions of dye concentration and pH. Moreover, Ox-GO also shows a notable improvement in the RB removal for a high dye concentration, where the removal capacity is almost 40% higher than that of GO. The enhancements in the dyes’ removal are attributed to the increased accessible surface area of Ox-GO, which provides more sites for dyes’ adsorption. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-11-30 2022-04-28T19:42:14Z 2022-04-28T19:42:14Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.apsusc.2021.150774 Applied Surface Science, v. 567. 0169-4332 http://hdl.handle.net/11449/222084 10.1016/j.apsusc.2021.150774 2-s2.0-85111530648 |
url |
http://dx.doi.org/10.1016/j.apsusc.2021.150774 http://hdl.handle.net/11449/222084 |
identifier_str_mv |
Applied Surface Science, v. 567. 0169-4332 10.1016/j.apsusc.2021.150774 2-s2.0-85111530648 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Applied Surface Science |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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 |
|
_version_ |
1808129203940360192 |