A fast route to obtain manganese spinel nanoparticles by reduction of K-birnessite - BRGM - Bureau de recherches géologiques et minières Access content directly
Journal Articles Journal of Solid State Chemistry Year : 2009

A fast route to obtain manganese spinel nanoparticles by reduction of K-birnessite

Abstract

The K-birnessite (KxMnO2·yH2O) reduction reaction has been tested in order to obtain manganese spinel nanoparticles. The addition of 0.25 weight percent of hydrazine hydrate, the reducing agent, during 24 hours is efficient to transform the birnessite powder in a hausmanite Mn3O4 powder. Well crystallised square shape nanoparticles are obtained. Different birnessite precursors have been tested and the reaction kinetics is strongly correlated to the crystallinity and granulometry of the precursor. The effects of aging time and hydrazine hydrate amount have been studied. Well crystallised Mn3O4 is obtained in one hour. The presence of feitknechtite (MnO(OH)) and amorphous nanorods has been detected as an intermediate phase during birnessite conversion into hausmanite. The conversion mechanism is discussed.

Domains

Earth Sciences

Dates and versions

hal-00512691 , version 1 (31-08-2010)

Identifiers

Cite

Fabien Giovannelli, T. Chartier, Cécile Autret-Lambert, Fabian Delorme, Mustapha Zaghrioui, et al.. A fast route to obtain manganese spinel nanoparticles by reduction of K-birnessite. Journal of Solid State Chemistry, 2009, 182 (5), p. 1021-1026. ⟨10.1016/j.jssc.2009.01.031⟩. ⟨hal-00512691⟩
173 View
0 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More