Application of Aluminium ferrisilicate/ Salophene Schiff base composite for uranium (VI) adsorption from sulfate leach liquor

Document Type : Original Article

Authors

Nuclear Materials Authority, P.O.Box 530 El Maadi, Cairo, Egypt.

Abstract

Aluminium ferrisilicate (AFS) and / aluminium ferrisilicate Salophene Schiff base composites were prepared,
characterized and tested for uranium (VI) adsorption from sulfate leach liquor using batch experiment
technique. The effect of adsorption parameters such as pH value, composite dose, initial uranium
concentration, shaking time, interfering ions and temperature were investigated and optimized. The kinetics of
uranium adsorption by (AFS) and (AFS/ Salophene Schiff base) composites were studied using Lagergren
pseudo-first order, pseudo-second order, Elovich, liquid film diffusion and intra-particle diffusion models. The
pseudo-second order model was more suitable for our experiment. These data show that the process was
exothermic and spontaneous. Testing of each composite for different adsorption isotherms revealed that the
achieved experimental data were fitting well with the Langmuir and Dubinin–Radushkevich isotherm models.
Using 0.25M H2SO4 acid solution, uranium (VI) ions was desorbed efficiently, and the composites were
successfully regenerated. The optimum conditions were applied for adsorption and precipitation of uranium
from cataclastic rocks, Abu Rusheid leach liquor, south Eastern De nsert, Egypt.

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