Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation.

Detalhes bibliográficos
Autor(a) principal: Dias, Anderson
Data de Publicação: 2008
Outros Autores: Sá, Rodrigo Gomes, Spitale, Matheus Calonge, Athayde, Maycon, Ciminelli, Virgínia Sampaio Teixeira
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFOP
Texto Completo: http://www.repositorio.ufop.br/handle/123456789/924
Resumo: Microwave-hydrothermal synthesis was employed to produce Na-birnessites. Crystalline, single-phase materials were obtained at temperatures as low as 120 8C and times as short as 1 min. X-ray diffraction and Raman spectroscopy were used to characterize the structural features of the nanostructured powders. Birnessites possessed a monoclinic structure in space group C2/m with nine Raman-active bands, all of which were observed for the first time due to optimized acquisition of the spectroscopic data. The highly reactive materials produced were submitted to sorption experiments with As(III). An oxidative precipitation occurred with the production of Mn(II) arsenate at higher arsenic concentrations. In addition, the formation of hausmannite (Mn3O4) was confirmed by X-ray diffraction and Raman analyses of the reacted solid phase. The observed 14 Raman-active modes were adjusted according to the tetragonal I41/amd space group for hausmannite. An additional band related to the breathing mode of the arsenate was observed, leading to the conclusion that adsorption onto hausmannite takes place in addition to the oxidative precipitation of manganese arsenate.
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spelling Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation.Chemical synthesisRaman spectroscopyOxidesMicrowave-hydrothermal synthesis was employed to produce Na-birnessites. Crystalline, single-phase materials were obtained at temperatures as low as 120 8C and times as short as 1 min. X-ray diffraction and Raman spectroscopy were used to characterize the structural features of the nanostructured powders. Birnessites possessed a monoclinic structure in space group C2/m with nine Raman-active bands, all of which were observed for the first time due to optimized acquisition of the spectroscopic data. The highly reactive materials produced were submitted to sorption experiments with As(III). An oxidative precipitation occurred with the production of Mn(II) arsenate at higher arsenic concentrations. In addition, the formation of hausmannite (Mn3O4) was confirmed by X-ray diffraction and Raman analyses of the reacted solid phase. The observed 14 Raman-active modes were adjusted according to the tetragonal I41/amd space group for hausmannite. An additional band related to the breathing mode of the arsenate was observed, leading to the conclusion that adsorption onto hausmannite takes place in addition to the oxidative precipitation of manganese arsenate.2012-06-21T18:03:30Z2012-06-21T18:03:30Z2008info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfDIAS, A. et al. Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation. Materials Research Bulletin, v. 43, n. 6, p. 1528–1538, jun. 2008. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0025540807002607>. Acesso em: 21 jun. 2012.00255408http://www.repositorio.ufop.br/handle/123456789/924O Periódico Materials Research Bulletin concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3333160000886info:eu-repo/semantics/openAccessDias, AndersonSá, Rodrigo GomesSpitale, Matheus CalongeAthayde, MayconCiminelli, Virgínia Sampaio Teixeiraengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOP2019-02-25T14:28:41Zoai:repositorio.ufop.br:123456789/924Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332019-02-25T14:28:41Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false
dc.title.none.fl_str_mv Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation.
title Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation.
spellingShingle Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation.
Dias, Anderson
Chemical synthesis
Raman spectroscopy
Oxides
title_short Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation.
title_full Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation.
title_fullStr Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation.
title_full_unstemmed Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation.
title_sort Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation.
author Dias, Anderson
author_facet Dias, Anderson
Sá, Rodrigo Gomes
Spitale, Matheus Calonge
Athayde, Maycon
Ciminelli, Virgínia Sampaio Teixeira
author_role author
author2 Sá, Rodrigo Gomes
Spitale, Matheus Calonge
Athayde, Maycon
Ciminelli, Virgínia Sampaio Teixeira
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Dias, Anderson
Sá, Rodrigo Gomes
Spitale, Matheus Calonge
Athayde, Maycon
Ciminelli, Virgínia Sampaio Teixeira
dc.subject.por.fl_str_mv Chemical synthesis
Raman spectroscopy
Oxides
topic Chemical synthesis
Raman spectroscopy
Oxides
description Microwave-hydrothermal synthesis was employed to produce Na-birnessites. Crystalline, single-phase materials were obtained at temperatures as low as 120 8C and times as short as 1 min. X-ray diffraction and Raman spectroscopy were used to characterize the structural features of the nanostructured powders. Birnessites possessed a monoclinic structure in space group C2/m with nine Raman-active bands, all of which were observed for the first time due to optimized acquisition of the spectroscopic data. The highly reactive materials produced were submitted to sorption experiments with As(III). An oxidative precipitation occurred with the production of Mn(II) arsenate at higher arsenic concentrations. In addition, the formation of hausmannite (Mn3O4) was confirmed by X-ray diffraction and Raman analyses of the reacted solid phase. The observed 14 Raman-active modes were adjusted according to the tetragonal I41/amd space group for hausmannite. An additional band related to the breathing mode of the arsenate was observed, leading to the conclusion that adsorption onto hausmannite takes place in addition to the oxidative precipitation of manganese arsenate.
publishDate 2008
dc.date.none.fl_str_mv 2008
2012-06-21T18:03:30Z
2012-06-21T18:03:30Z
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 DIAS, A. et al. Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation. Materials Research Bulletin, v. 43, n. 6, p. 1528–1538, jun. 2008. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0025540807002607>. Acesso em: 21 jun. 2012.
00255408
http://www.repositorio.ufop.br/handle/123456789/924
identifier_str_mv DIAS, A. et al. Microwave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation. Materials Research Bulletin, v. 43, n. 6, p. 1528–1538, jun. 2008. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0025540807002607>. Acesso em: 21 jun. 2012.
00255408
url http://www.repositorio.ufop.br/handle/123456789/924
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 Institucional da UFOP
instname:Universidade Federal de Ouro Preto (UFOP)
instacron:UFOP
instname_str Universidade Federal de Ouro Preto (UFOP)
instacron_str UFOP
institution UFOP
reponame_str Repositório Institucional da UFOP
collection Repositório Institucional da UFOP
repository.name.fl_str_mv Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)
repository.mail.fl_str_mv repositorio@ufop.edu.br
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