Síntese e caracterização de óxido de Mn nanoestrutura em camada (Ca-OL-2) a partir de minérios da antiga mina de Serra do Navio (Amapá)
Resumo
In this study, layered nanostructured Mn oxide, Ca-OL (octahedral layer), was obtained from Mn ores of Serra do Navio (Amapá, Brazil). The developed synthetic route used dissolution chemical processes, precipitation, ion exchange and hydrothermal treatment, respectively. The results showed the presence of DRX peaks in the position 12,5 and 25º (2 theta), confirming Mn oxide Na-birnessite-type structure (Na-OL-1) obtainment which transformed into Ca-buserite (Ca-OL-2) after Ca2+ ion exchange. Infrared spectroscopy (FTIR) bands of the MnO6 octahedrons Mn-O vibrational bond were identified in the range of 800 to 400 cm-1 which confirmed the DRX data obtained. The Ca-OL-2 thermal behavior obtained by TG-DTA showed thermal stability above 850 ºC, thus exhibiting that products as ores can be transformed into Mn oxides nanolayers with high thermal stability.
Os arquivos de licença a seguir estão associados a este item: