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Exchange kinetics of perrhenate, tungstate, and phosphate on the hydrated oxides of quadrivalent metals

Journal Article · · J. Appl. Chem. USSR (Engl. Transl.); (United States)
OSTI ID:7059644
This paper determines the kinetic parameters characterizing the uptake of certain anions (phosphate, tungstate, and perrhenate) by hydrated zirconium and tin oxides (HZO and HTO). The interrupt method was used to determine the diffusion stage governing the exchange rate. It was found that diffusion in the sorbent grains limits the rates of uptake of phosphate, tungstate, and perrhenate from 1 M NH/sub 4/NO/sub 3/ solution by granulated zirconium and tin oxides and by those oxides deposited on activated charcoal. Values have been determined for the internal-diffusion coefficients (10/sup -8/-10/sup -9/cm/sup 2//sec) and apparent activation energies (14-27 kJ/mole). It is found that mixed sorbents have better kinetic characteristics than do granulated hydroxides.
OSTI ID:
7059644
Journal Information:
J. Appl. Chem. USSR (Engl. Transl.); (United States), Journal Name: J. Appl. Chem. USSR (Engl. Transl.); (United States) Vol. 58:7,PT.1; ISSN JAPUA
Country of Publication:
United States
Language:
English