Selective separation of Th(IV) from its solutions using amine modified silica gel produced from leached zircon |
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| Authors: | Email author" target="_blank">A?M?DoniaEmail author A?A?Atia A?M?Daher O?A?Desouky E?A?Elshehy |
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| Institution: | (1) Department of Chemistry, Faculty of Science, Menoufia University, Shibin El Kom, Egypt;(2) Nuclear Materials Authority, El Maadi, Cairo, Egypt |
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| Abstract: | A solution of sodium silicate produced as a waste from the alkali fusion of Egyptian Rosetta zircon mineral was used for preparation
of a silica gel in the pH range 6–7. A silica gel modified with tetraethylenepentamine (TEP) and diethylenetriamine (DET)
functionalities were prepared. The success of immobilization process was confirmed by means of FT-IR, energy dispersive X-ray
spectrometric analysis (EDX) and elemental analysis. The surface properties of the modified silica obtained were investigated
by means of nitrogen surface area. The uptake behaviour of the modified silica towards Th(IV) ions at different experimental
conditions of pH, time, concentration and temperature using batch method was studied. Kinetics and thermodynamics studies
showed an endothermic pseudo-second order adsorption process. Regeneration of the loaded silica was performed using 1 M HNO3. The investigated silicas have successfully been applied for separating of Th(IV) from U(VI) in nitric acid solution obtained
from alkaline leaching of Egyptian monazite sand. |
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