Crystalline todorokite associated with biogenic debris in manganese nodules.

Formation of todorokite from “c-disordered” H+-birnessites: the roles of average manganese oxidation state and interlayer cations

BACKGROUND Todorokite, a 3 × 3 tectomanganate, is one of three main manganese oxide minerals in marine nodules and can be used as an active MnO6 octahedral molecular sieve. The formation of todorokite is closely associated with the poorly crystalline phyllomanganates in nature. However, the effect of the preparative parameters on the transformation of "c-disordered" H(+)-birnessites, analogue t...

Biogenic Mn oxides for effective adsorption of Cd from aquatic environment.

Biogenic Mn oxides exert important controls on trace metal cycling in aquatic and soil environments. A Mn-oxidizing bacterium Bacillus sp. WH4 was isolated from Fe-Mn nodules of an agrudalf in central China. The biogenic Mn oxides formed by mediation of this Mn oxidizing microorganism were identified as short-ranged and nano-sized Mn oxides. Cd adsorption isotherms, pH effect on adsorption and ...

Manganese oxide minerals: crystal structures and economic and environmental significance.

Manganese oxide minerals have been used for thousands of years-by the ancients for pigments and to clarify glass, and today as ores of Mn metal, catalysts, and battery material. More than 30 Mn oxide minerals occur in a wide variety of geological settings. They are major components of Mn nodules that pave huge areas of the ocean floor and bottoms of many fresh-water lakes. Mn oxide minerals are...

Todorokite-type manganese oxide nanowires as an intercalation cathode for Li-ion and Na-ion batteries

Synthesis of todorokite-type manganese oxide from Cu-buserite by controlling the pH at atmospheric pressure

1387-1811/$ see front matter 2008 Elsevier Inc. A doi:10.1016/j.micromeso.2008.06.006 * Corresponding author. E-mail address: [email protected] (F. Liu). A todorokite-type manganese oxide molecular sieve material was successfully synthesized at atmospheric pressure by refluxing treatment of Cu exchanged Na-buserite (named as Cu-OMS-1). TEM (transmission electron microscope) and HRTEM (hig...