Síntese e caracterização de óxidos de manganês: transformação de estruturas em camada para estruturas em túnel

  • FIGUEIRA, Bruno Apolo Miranda
Publication date
April 2007
Publisher
Programa de Pós-Graduação em Geologia e Geoquímica

Abstract

This work describes the preparation, characterization e application of manganese oxides with layer structure like - birnessite with alkaline ions interlayer Na+ e K+. These structures are made of the octahedron MnO6 shared by edges and/or corners as basic building block, with oxidation states +2, +3 e +4, giving vacancies in the structure and a resulting negative charge neutralized by interlayer cations. The methods already known in literature to synthesize birnessite were: reduction (K, Na-birnessite) and sol - gel (Kbirnessite). Later, this layer structures synthesized were applied to the attainment of structures in tunnel: manganite, K-hollandite, and todorokite. From the synthetic methods, the most practical and efficient for the prepar...

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