Oxidative dissolution of SbO mediated by surface Mn redox cycling in oxic aquatic systems.

Antimony trioxide (SbO) is one of the primary forms of Sb in the environment, and its dissolution significantly impacts the migration and bioavailability of Sb. However, the dissolution of SbO coupled with abiotic redox of Mn processes is unclear. Here, we investigated the kinetics of SbO dissolution in the presence of the ubiquitous Mn(II) by kinetic experiments, spectroscopies, density functional theory calculations and the chemical kinetic modeling.

Unraveling the molecular mechanisms of Cd sorption onto MnO-loaded biochar produced from the Mn-hyperaccumulator Phytolacca americana.

Engineered biochar represents a promising material for green remediation practices. In this paper, we present an innovative approach to produce MnO-loaded biochars by pyrolyzing the biomass of a Mn-hyperaccumulator species (Phytolacca americana). Batch sorption and stirred-flow kinetic experiments were combined with spectroscopic techniques to elucidate the mechanisms behind the Cd sorption onto those biochars, named here as PABCs.

Combining multisurface model and Gouy-Chapman-Stern model to predict cadmium uptake by cabbage (Brassica Chinensis L.) in soils.

Cadmium is an extremely toxic substance known to cause serious health problems. The uptake of Cd in plants is critically affected by dissolved Cd in soil porewater, controlled by soil physicochemical properties. Rhizo-availability of Cd is assumed, as the Cd fraction is found on the plasma membrane of surface root cells.

Long-term dissolution and transformation of ZnO in soils: The roles of soil pH and ZnO particle size.

The ongoing use of ZnO nanoparticles (NPs)-associated commercial products results in large release of ZnO NPs into soils and has prompted systematic investigation regarding their fractionation and fate in soils. To date, little information is available about the long-term dissolution and transformation of ZnO NPs in different soils. The distribution and speciation of Zn in two different soils (i.

Role of Reduced Sulfur in the Transformation of Cd(II) Immobilized by δ-MnO.

Mn oxides are the major sinks for Cd(II) in the aquatic environment. At the redox interface, reduced sulfur might affect the fate of sorbed Cd(II) by either reducing Mn oxides or forming strong complexes with Cd(II). Here, we investigated the fate of Cd(II) immobilized on δ-MnO affected by reduced sulfur (S and cysteine).

Antimony oxidation and sorption behavior on birnessites with different properties (δ-MnO and triclinic birnessite).

Birnessites are abundant naturally occurring minerals with high sorption and oxidation capacity that could therefore play an important role in antimony (Sb) migration and transformation. There are various types of birnessites in the environment. However, little is known about the similarities and differences in Sb oxidation and sorption on birnessites with different properties.

Formation of Cd precipitates on γ-AlO: Implications for Cd sequestration in the environment.

Apart from surface complexation, precipitation of minerals also plays an important role in reducing the mobility and transport of heavy metals in the environment. In this study, Cd(II) sorption species on surfaces of γ-AlO at pH 7.5 were characterized using multiple techniques.

Wien effect of Cd/Zn on soil clay fraction and their interaction.

Background: The coexistence of Cd and Zn ions in nature has a significant influence on their environmental behaviors in soils and bioavailability for plants. While many studies have been done on the mutual toxicity of Cd and Zn, few studies can be found in the literature focused on the interaction of Cd and Zn on soil clay fractions especially in terms of energy relationship.

Results: The binding energies of Cd on boggy soil (Histosols) particles and Zn on yellow brown soil (Haplic Luvisols) particles were the highest, while those of Cd and Zn on paddy soil (Inceptisols) particles were the lowest.