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Experimental and Theoretical Diffusivities of Cd and Sr in Hydrous Ferric Oxide

✍ Scribed by Lisa Axe; Paul R. Anderson

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
265 KB
Volume
185
Category
Article
ISSN
0021-9797

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✦ Synopsis

Oxides of manganese, aluminum, and especially iron are important sorbents for inorganic contaminants. The sorption process can be characterized by two steps. The first step is a rapid, reversible reaction between the bulk aqueous phase and external surfaces. The slow, second step is the rate limiting mechanism wherein the contaminant diffuses through small pores along surface sites. Isotherm and constant boundary condition studies were conducted to evaluate the sorption process. Best fit experimental surface diffusivities ranged from 10(-14) to 6 x 10(-13) cm2/s. Using site activation theory and assuming a sinusoidal potential field along the pore surface, theoretical surface diffusion coefficients were estimated from the adsorption enthalpy.

πŸ“œ SIMILAR VOLUMES

Experimental and Theoretical Diffusiviti
Experimental and Theoretical Diffusivities of Cd and Sr in Hydrous Ferric Oxide: Volume 185, Number 2 (1997), pages 436–448
✍ Lisa Axe; Paul R. Anderson πŸ“‚ Article πŸ“… 1999 πŸ› Elsevier Science 🌐 English βš– 13 KB

The authors recently discovered an error in the calculations of the estimated activation energies (E A ) for strontium and cadmium adsorption to hydrous ferric oxide (HFO). On page 446, they presented the following in Table 2: for Sr ␣ ϭ 0.88 and E A ϭ 8.7 kcal/mol, and for Cd ␣ ϭ 0.5 and E A ϭ 10.7