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Theoretical Solid/Solution Ratio Effects on Adsorption and Transport: Uranium(VI) and Carbonate

^a Dep. of Civil Engineering, 238 Harbert Engineering, Center Auburn Univ., Auburn, AL 36849
^b Dep. of Geology and Geophysics, Univ. of Wisconsin, 1215 W. Dayton St., Madison, WI 53706

View larger version (14K): [in this window] [in a new window]   Fig. 1. Calculated adsorption isotherms in the absence of carbonate. A, B, and C correspond to the cases shown in Table 2.

View larger version (16K): [in this window] [in a new window]   Fig. 2. Calculated adsorption isotherms as a function of solid/solution ratio with total carbonate of 0.01 M. G, H, and I correspond to the cases shown in Table 2.

View larger version (17K): [in this window] [in a new window]   Fig. 3. Calculated adsorption isotherms with solid/solution ratio set at 3.33 g L–1 with carbonate concentration varying from 0.0 to 0.01 M. A, D, and G correspond to the cases shown in Table 2.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Calculated adsorption isotherms at a solid/solution ratio of 333 g L–1. O, C, and I correspond to the cases shown in Table 2.

View larger version (14K): [in this window] [in a new window]   Fig. 5. Calculated percentage of surface sites occupied by the adsorbed species at a solid/solution ratio of 333 g L–1 and total carbonate (CTCO3) = 0.01 M, Case I in Table 2.

View larger version (15K): [in this window] [in a new window]   Fig. 6. Calculated percentage of surface sites occupied by the adsorbed species at a solid/solution ratio of 333 g L–1 and total carbonate (CTCO3) = 0.01 M in the absence of U(VI)–carbonate aqueous complexes, Case O in Table 2.

View larger version (11K): [in this window] [in a new window]   Fig. 7. Calculated total aqueous carbonate vs. solid/solution ratio with a total carbonate of 0.01 M (pH = 7, ionic strength I = 0.1 M). The total aqueous carbonate is dependent on the solid/solution ratio, but all of the points (I–IV) still fall on the carbonate adsorption isotherm (Fig. 8).

View larger version (14K): [in this window] [in a new window]   Fig. 8. Calculated adsorption isotherm for carbonate at a solid/solution ratio of 333 g L–1 (Case M in Table 2). In the absence of U(VI), the carbonate isotherm is independent of the solid/solution ratio (not shown). Points I to IV correspond to the same points as in Fig. 7.