Computer Science
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975gecoa..39..505m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 39, Issue 4, pp.505-519
Computer Science
30
Scientific paper
The adsorption of metal ions was measured and alkalimetric titrations were performed on a synthetic sample of hydrous manganese dioxide. The principal characteristics of this phase, its stoichiometry, X-ray diffraction pattern and surface area, resemble closely naturally occurring manganese minerals. Both sets of experiments indicate that the affinity of the metals for the surface followed the order: Mg < Ca < Sr < Ba < Ni < Zn < Mn <-Co, and that the interaction can be characterized by its pH dependence. A comparison of the amount of metal absorbed with the amount of acid released by the surface showed that the interaction of metals with the hydrous manganese dioxide surface involves (1) the separation of a proton from the covalent bond at the surface, and (2) the association of a solute cation with this site. Mg < Ca < Sr < Ba < Ni < Zn < Mn <-Co, The relative degree of the bond strength is reflected by the specific adsorption potentials, which are determined from the amount of metal that is absorbed by the surface, in the absence of any electrostatic attraction, at the pH of zero point of charge.
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