Abstract
Sodium content and suspension pH control crystallite size and aggregation in δ-MnO2nanoparticles.
Highlights
MnO6 octahedra held together by interlayer cations and water, which compensate for the structural charge arising primarily from the presence of layer MnIJIV) vacancies and layer MnIJIII) that can occupy MnIJIV) sites.[1]
Chemical analysis showed that the Na : Mn molar ratio increased from 16% to 35% as the synthesis pH increased from 4 to 12, whereas the K : Mn molar ratio was less than 0.1% in all samples after Na-for-K exchange
To the extent of our knowledge, this is the first study that investigates the difference between the hydrodynamic particle size, the crystallite size and the dry specific surface area in layer-type Mn oxides
Summary
MnO6 octahedra held together by interlayer cations and water, which compensate for the structural charge arising primarily from the presence of layer MnIJIV) vacancies and layer MnIJIII) that can occupy MnIJIV) sites.[1] Such a birnessite tends to be nanocrystalline and have hexagonal layer symmetry,[4] orthogonal symmetry can be attained depending on the content and distribution of layer MnIJIII) octahedra.[5,6]. Due to its nanoscale dimensions and the presence of reactive surface sites at the particle edges and basal surface, birnessite participates in numerous environmental reactions with organic and inorganic compounds.[4,7,8] a large number of laboratory studies have aimed at Paper. Environmental Science: Nano determining the mechanisms through which birnessite adsorbs toxicant metals such as Pb, Zn, Cd, and Ni The sorption and redox properties of birnessite have been investigated in technical systems for their potential use in remediation strategies[7,23,24] or as water oxidation catalysts.[25,26] The majority of these studies have employed δ-MnO2 as an analog for natural birnessite with hexagonal sheet symmetry and nanoscale dimensions.[1,9,14,27]
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