The kinetic, equilibrium and thermodynamic characteristics of U(VI) recovery by the strong base anion exchange resin Ambersep 920U SO 4 from Gabal Gattar sulfate leach liquor have been determined. Batch sorption experiments are performed to evaluate the optimum conditions at pH2, 200 mg resin dose for 120 min contact time at room temperature. The maximum sorption capacity reaches to 58 mg/g at 298 K. The kinetics data are well described by the pseudo-second-order kinetic model at different uranium concentrations. The experimental results obtained at various temperatures showed that the adsorption pattern on the studied resin has followed Langmuir isotherm model. The evaluation of thermodynamic parameters (free energy change DG, enthalpy change DS, entropy change DH, activation energy E a and sticking probability S*) indicate that the adsorption process is spontaneous in nature, endothermic, randomness and chemisorptions. Uranium(VI) can be completely desorbed from the loaded resin using 0.5 M HNO 3 solution. Finally, the optimized factors have been carried out for uranium(VI) recovery from G. Gattar leach liquor.

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The Al 2 O 3 -SiO 2 -BFS (AS-BFS) solid adsorbent was developed from blast furnace slag (BFS). The potentiality of the AS-BFS for uranium ion removal from an aqueous medium, via the batch method, was explored and disused in terms of dynamic and isothermal properties. The sorbent exhibited good reusability, a high capacity for uranium ions, and a good specific surface area. The results showed that the sorbent evacuated uranium at about 88.5 mg/g. The sorbent represents a promising waste-derived substitute for other sorbents for water treatment.

KEYWORDSSorption of uranium from 6 M free H2SO4 on two anionic sorbents containing different complexing groups, the synthetic Organosilicate compound (OSC) and the Amberlite IRA 402, were investigated. The sorption mechanisms of uranium on both sorbents were also studied. Experimental data indicated that the uranium sorption on either Amberlite IRA 402 or OSC is a function in pH, depending strongly on the aqueous uranyl species. Both sorbents reached a maximum at slightly acidic (pH = ~1) when uranium is exist in the form of negatively charged sulfate complexes. These sorption values were attributed to the ion exchange process between UO2 +2 species and interlayer anions on Amberlite IRA 402 and OSC in acidic solutions. Uranium sorbed on OSC through formation of ML3 complex and ML2 for Amberlite IRA 402. Also it was found that the uranium sorption capacity was 20 and 80 mg/g for Amberlite IRA 402 and OSC, respectively, and its elution were effective even with 5 mL of 1 mol/L KNO3. Sorption Uranium Investigation Sulfate solution Amberlite IRA 402 Organosilicate compound

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A new adsorbent has been developed to reduce the concentration of iron in crude Egyptian phosphoric acid. This adsorbent has been formed by the treatment of silicate compound derived from clay mineral with π organic acceptor ligand to carry out the exchange of ions as well as complexation with iron. Several parameters (shaking time, temperature, sorbent mass, and batch factor) have been studied. The adsorption of iron from crude phosphoric acid was investigated. The various methods to characterize the adsorption of iron on organosilicon compound (OSC) were collectively evaluated in this study. According to the Langmiur model, the maximum monomolecular capacity (Q º ) is 122 mg/g and 122 mg/g with Freundlich model for an initial iron concentration of 2.37% contained in crude phosphoric acid. Characterization studies such as x-ray diffraction, infrared spectroscopy and electron scanning microscope were investigated to substantiate the nature of iron-OSC complexes.