الفهرس 
Introduction
Chemical and radioactive contaminantOnly 14 pages are availabe for public view
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Abstract
The main objective of the work presented in this thesis is to study the adsorption of U(VI), Cr(VI) and Gd(III) from aqueous medium using modified Sorels cement as artificial adsorbents. In the first part, characterization was carried out on two adsorbents, MF51 and MF52. In the second part, equilibrium investigations were carried out on the two adsorbents MF51 and MF52 to select a suitable conditions for adsorption of U(VI), Cr(VI) and Gd(III). The different parameters include the effect of pH, weight of adsorbents, the effect of contact time, the effect of metal ions concentration, carbonate medium concentration and loading capacity of the adsorbents as well as temperature. It was found that, MF51 and MF52 are effective for removal of U(VI), Cr(VI) and Gd(III) over the pH range 411 and in all cases the equilibrium pH was found to equal 9.69.8. MF52 showed higher adsorption than MF51. In the third part, the kinetics and thermodynamic properties of adsorption of the metal ions of interest with MF51 and MF52 were investigated. The values of overall rate constant (K) were found to slightly decrease with increasing U(VI) and Cr(VI) initial concentrations using MF51 and MF52. In case of Gd(III), there is almost no effect noticed for (K) with different initial Gd(III) concentration studied using MF51, but (K) was found to slightly decrease using MF52. The effect of temperature on the rate of adsorption was studied at temperature values 10, 25, 30 and 50 oC using MF51 and MF52 adsorbents and the activation energy (E) and (SE(BH were calculated and discussed.