Sorption and oxidation reactions in the environment may affect substantially the mobility of
redox-sensitive toxic trace elements and compounds. Investigating the environmental factors …

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 sorption reactivity is typically associated with cation metal sorption at internal
vacancy sites, through a highly favorable tridentate configuration. However, poorly …

Studies of the adsorption of Co (II) on synthetic birnessite have been carried out at pH 4, 6,
7, 8 and 10. At pH values of 4, 6 and 7 cobalt (II) is oxidized to Co (III) while at pH 8 and 10 …

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 …

Manganese (IV) oxides, and more especially birnessite, rank among the most efficient metal
oxides for As (III) oxidation and subsequent sorption, and thus for arsenic immobilization …

The oxidation of arsenite (As (III)) by manganese oxide is an important reaction in both the
natural cycling of As and the development of remediation technology for lowering the …

X-ray Photoelectron Spectroscopy (XPS) was used to investigate oxidation of aqueous Cr
(III) at the surface of 7 Å-birnessite [MnO1. 75 (OH) 0.25]. Special emphasis was placed on …

Arsenite is more toxic and mobile than As (V) in soil and sediment environments, and thus it
is advantageous to explore factors that enhance oxidation of As (III) to As (V). Previous …

Reductive dissolution of synthetic 7Å-birnessite [MnO1. 7 (OH) 0.25 or MnO1. 95] by Na-
oxalate produces a Mn (III) intermediate reaction product (here represented as MnOOH∗) …