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

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorDias, Anderson-
Autor(es): dc.creatorSá, Rodrigo Gomes-
Autor(es): dc.creatorSpitale, Matheus Calonge-
Autor(es): dc.creatorAthayde, Maycon-
Autor(es): dc.creatorCiminelli, Virgínia Sampaio Teixeira-
Data de aceite: dc.date.accessioned2019-11-06T13:24:04Z-
Data de disponibilização: dc.date.available2019-11-06T13:24:04Z-
Data de envio: dc.date.issued2012-06-21-
Data de envio: dc.date.issued2012-06-21-
Data de envio: dc.date.issued2008-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/123456789/924-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/554606-
Descrição: dc.descriptionMicrowave-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.-
Idioma: dc.languageen-
Direitos: dc.rightsO Periódico Materials Research Bulletin concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3333160000886-
Palavras-chave: dc.subjectChemical synthesis-
Palavras-chave: dc.subjectRaman spectroscopy-
Palavras-chave: dc.subjectOxides-
Título: dc.titleMicrowave-hydrothermal synthesis of nanostructured Na-birnessites and phase transformation by arsenic(III) oxidation-
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