Please use this identifier to cite or link to this item: http://repositorio.ufpa.br:8080/jspui/handle/2011/8580
Title: Caracterização química e mineralógica de birnessita natural da Mina do Azul (Província Mineral de Carajás, Brasil) e seu análogo sintético (K-OL-1) obtido pelo método sol-gel
Other Titles: Chemical and mineralogical characterization of natural birnessite from Azul Mine (Carajás Mineral Province, Brazil) and its synthetic analogous (K-OL-1) obtained by sol-gel method
metadata.dc.creator: FIGUEIRA, Bruno Apolo Miranda
ANGÉLICA, Rômulo Simões
COSTA, Marcondes Lima da
MERCURY, José Manuel Rivas
SANTOS, Manoel Roberval Pimentel dos
POELLMANN, Herbert
Keywords: Caracterização mineral
Caracterização química
Birnessita
Província mineral de Carajás (PA)
Compostos lamelares
Composição química
Issue Date: Jun-2016
Publisher: Universidade Federal do Pará
Citation: FIGUEIRA, Bruno Apolo Miranda et al. Caracterização química e mineralógica de birnessita natural da Mina do Azul (Província Mineral de Carajás, Brasil) e seu análogo sintético (K-OL-1) obtido pelo método sol-gel. Cerâmica, São Paulo, v. 62, n. 362, p. 128-132, abr./jun. 2016. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132016000200128&lng=pt&nrm=iso>. Acesso em: 31 maio 2017. <http://dx.doi.org/10.1590/0366-69132016623621875>.
Abstract: This paper presents a comparative chemical and mineralogical study of birnessite (BIR-AZ) collected from Azul mine (Carajás Province, Brazil) and its synthetic analogous synthesized by sol-gel method. The products were characterized by X-ray diffraction, FT-Raman spectroscopy, thermal analysis (TG-DTA), scanning electron microscopy (SEM) and ICP-MS techniques. The results obtained confirm the presence of well-defined layer structures having monoclinic system, C2/m space group and the unit cell parameters are: BIR-AZ, a = 5.148 Å; b=2.843 Å, c=7.175 Å, and β = 100.75º; K-OL-SG, a = 5.150 Å; b = 2.846 Å, c = 7.214 Å, and β= 101.29º. The birnessite from Azul mine ores shows thermal stability up to 600 ºC, whereas its synthetic analogous, above 900 ºC. FT-Raman bands at 635, 570 and 410 cm-1 were identified and attributed to the Mn-O and K-O bond deformations in the birnessite structure. SEM images reveals that the manganese oxide mineral consist of platy packed particles of about 1 to 5 µm. By contrast, the morphology of the synthetic compound displays randomly arranged globules (<1 µm).
URI: http://repositorio.ufpa.br/jspui/handle/2011/8580
ISSN: 1678-4553
Appears in Collections:Artigos Científicos - IG

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