Birnessite is ubiquitous in the natural environment where heavy metals are retained and
easily transformed. The surface properties and structure of birnessite change with the …

Birnessite, a phyllomanganate and the most common type of Mn oxide, affects the fate and
transport of numerous contaminants and nutrients in nature. Birnessite exhibits hexagonal …

Thallium (Tl) isotopes are used to reconstruct changes in global ocean oxygenation by
tracking changes in past sedimentary manganese (Mn) oxide burial. This utility is born out of …

MnO2 nanoparticles, similar to those found in soils and sediments, have been characterized
via their UV–visible and Raman spectra, combined with dynamic light scattering and …

Abstract Polymorphs of MnO 2 comprise Mn (III) and Mn (IV), which are both strong oxidants
capable of BPA degradation, but their relative contributions are unclear. To advance process …

Adsorption plays an important role in the biogeochemical cycling of selenium (Se) in natural
environments and Se isotope fractionation during adsorption is a significant but poorly …

Iron (oxyhydr) oxides are sensitive indicators of pH, Eh, temperature, microbial activity, and
climate conditions in the Critical Zone. The most ubiquitous and environmentally significant …

Abstract Naturally occurring Mn (IV/III) oxides are often formed through microbial Mn (II)
oxidation, resulting in reactive phyllomanganates with varying Mn (IV), Mn (III), and vacancy …

Abstract Biogenic Mn oxides (BMOs), the main component of natural Mn oxides, closely
relate to Cd in sediment. However, the immobilization behavior of Cd in sediments by BMOs …

The characterization of birnessite structures is particularly challenging for poorly crystalline
materials of biogenic origin, and a determination of the relative concentrations of triclinic and …