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Abstract
Amberlite IRA 400 was impregnated with N, N’, N’-Tetramethylethylenediamine (ATMEDA) as well as N-Methyl benzyl amine (AMBA) and examined for uranium uptake efficiency from sulfate medium. The potential of the studied adsorbents for uranium uptake was evaluated at different conditions; the effect of aqueous uranium concentration, contact time, pH value, temperature variation, amount of added adsorbent and matrix competitive ions. The implication of adsorption isotherms for (Amberlite IRA 400), (AMBA) and (ATMEDA) revealed that the results correlate with the Langmuir isotherm model with 90.90, 181.81 and 196.07 mg/g as theoretical capacity. Uranium adsorption kinetics was studied using Lagergren pseudo-firrst order, pseudo-second-order, Elovich and intra-particle diffusion models. Studied kinetics revealed that the process corresponds to the pseudo-second-order model. Optimum conditions were applied for uranium (VI) recovery from sulfate leach liquor of cataclastic rocks, Abu-Rusheid, south Eastern Desert, Egypt. The final uranium precipitate was characterized using ICP-OES, XRF and EDX.