Manganese dioxide, hydrous

Chelating polymers, hexacyanoferrates, manganese dioxide, hydrous titanium oxide... 

Fig. 2. Hydration of the surface stmcture of manganese dioxide (2) and subsequent reactions of hydrous manganese oxide (3) showing proton transfer (4)...

Ion Ionic radius, pm CoUoidal hydrous manganese dioxide, mol/mol Hydrated radius, pm 5-Mn02, )J.mol/g... 

Traina S.J., Doner H.E. Heavy metal induced released of manganese (II) from a hydrous manganese dioxide. Soil Sci Soc Am J 1985 49 317-321. 

It is considered that hydrous manganese dioxides and their derivatives used as sorbents belong to the crystallographic group of a-Mn02, where the atomic ratio 0 Mn<2, and the presence of side ions is a prerequisite of the very existence of this type of the crystalline lattice. For example, in various synthetic samples, the 0 Mn ratio can vary from 1.95 to 1.70. This means that the oxidation state of manganese in synthetic manganese oxides is seldom equal to 4. 

To determine 63 Ni in seawater the nickel was adsorbed on to hydrous manganese dioxide and the precipitate dissolved in hydrochloric acid. The nickel was then extracted with diethyldithiocarbamate in chloroform and determined by liquid scintillation counting [527]. 

Hydrous ferric hydroxide (HFO), for arsenic removal, 3 279, 283-285 Hydrous manganese dioxide, 15 581 Hydrous manganese oxides, 15 585... 

Murray, J. W. The surface chemistry of hydrous manganese dioxide. J, Colloid. Interface Sci. 357-371 (1974). 

The most commonly reported solid forms of iron and manganese oxides in marine sediments and ferromanganese nodules are goethite (aFeOOH) and hydrous manganese dioxide (bimessite, todorokite and 6Mn02) (, . The surface chemistry of... 

Similar behavior has been observed with different modifications of Mn(IV) oxides. The cryptomelane type of hydrous manganese dioxide prepared by the reaction of Mn(II) and KMn04 in sulfuric acid solution exhibits an extremely high selectivity for potassium ions [120]. The spinel type of manganese oxide prepared by the introduction of lithium ion has exhibited an extremely high selectivity for lithium ion [121, 122]. These aspects are considered later. 

Manganese dioxide, sodium nickel hexacynaoferrate, hydrous titanium oxide, zirconium phosphate, ferric hydroxide, different commercial sorbents... 

Tripathy, S.S., Kanungo, S.B. and Mishra, S.K., The electrical double layer at hydrous manganese dioxide/electrolyte interface, J. Colloid Inlerf. Sci., 241, 112, 2001. 

Kanungo, S.B. and Mahapatra, D.M., Interfacial properties of some hydrous manganese dioxides in 1-1 electrolyte solution, 7. Colloid Interf. Sci., 131, 103, 1989. 

Murray. J.W.. The interaction of cobalt with hydrous manganese dioxide, Geochim. Cosmochim. Acta, 39, 635, 1975. 

Inman, M.P., Beattie, J.K., Jones, D.R. and Baldwin, D.S. (2001) Abiotic hydrolysis of the detergent builder tripolyphosphate by hydrous manganese dioxide. Water Research 35, 1987-1993. 

White, D.A., and Labayru, R., Synthesis of a manganese dioxide-silica hydrous composite and its properties as a sorption material for strontium, Ind. Eng. Chem. Res., 30(1), 207-210 (1991). 

Stock solution of nitrite, 5 mol/L Prepened by dissolution of the sodium salt in 500 mL of water. This solution is the main source of the reagent cobalt contribution. Cobalt contamination in this solution is removed by electrolysis (24 h) above a mercury pool electrode at a potential of -1.35 V. Alternatively, hydrous manganese dioxide (Mn02) can be added to a final concentration of 100 /tmol/L followed by filtration (0.2 pm filter). The electrolytic purification lowers the cobalt contribution to below 4 pmol/L. 

Zhang, J. et al. 2011. Synthesis, characterization and capacitive performance of hydrous manganese dioxide nanostructures. Nanotechnology, 22,125703. 

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