Physics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.2861a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 55, Issue 10, pp.2861-2866
Physics
3
Scientific paper
The oxidation kinetics of Cr(III) to Cr(VI) on the surface of manganite ( -MnOOH) have been investigated as a function of Cr(III) and manganite concentration, pH, ionic strength, and temperature. The reaction is first order with respect to the manganite adsorption density and also to Cr(III) concentration up to a critical adsorption density (0.2 mol m -2 ). Above this concentration the reaction appears to be inhibited. The reaction is independent of pH and ionic strength. The rate law can be written as d [ Cr ( VI )]/ dt = k · ([ Cr ( III ) 0 ] - [ Cr ( VI )]) · { - MnOOH } where k is 1.08 × 10 -2 ± 0.03 × 10 -2 L m -2 s -1 and [Cr(III) 0 ], [Cr(VI)], and { -MnOOH} are the concentrations of initial Cr(III), Cr(VI), and manganite in mol / L and m 2 / L , respectively. Approximately three Mn(II) ions are released for every Cr(III) ion which is oxidised. In the presence of organic ligands the reaction proceeds more slowly.
Annette Johnson Carola
Xyla Aglaia G.
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