Hexagonal birnessite is the most ubiquitous manganese oxide in geological environments. It
is often highly enriched in trace metal ions such as Ni and plays an important role in metal …

Natural hexagonal birnessites are enriched in various transition metals (TMs). Many studies
have examined the effects of single metal doping on the structures and properties of …

Despite its presence in limited amounts, birnessite has a wide spread distribution and is
often highly enriched in trace metals such as Co in diverse geological environments. This …

Sorption of Ni to birnessite is a fundamental control on the concentration of Ni in natural
waters and associated sediments. Recent XAS work suggests the crystal-chemistry of Ni in …

The surface reactivity of biogenic birnessite is attributed to its structure. However, structural
control of heavy metal adsorption on biogenic birnessite is not well understood. Here a …

Fe-doped hexagonal birnessite was synthesized by adding Fe 3+ to the initial reactants, and
the effects of Fe doping on the structures and properties of birnessite were investigated and …

Purpose Lead contamination is ubiquitous, and much attention has been paid due to its
toxicity. The phyllomanganate birnessite is the most common Mn oxide in soils. The MnO 6 …

Sorption mechanisms of heavy metals at the mineral/water interface are largely controlled by
the type and number of sorption sites on the mineral surfaces. However, in the case of …

Birnessite, a layered manganese (Mn) oxide, possesses extraordinary metal adsorption and
oxidation activity, and thus imposes impacts on many biogeochemical processes. The …

Synthetic hexagonal birnessite (Hx-birnessite) is a close analogue to natural poorly
crystalline phyllomanganate phases found in soils and marine ferromanganese deposits …