Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 295, Issue 1, Pages 709-715Publisher
SPRINGER
DOI: 10.1007/s10967-012-2158-3
Keywords
Uranium; Adsorption; Elution; PVC cement; Nitric acid raffinate solution
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The present work deals with uranium removal from a nitric acid raffinate (waste) solution using prepared solvent (tri-butyl phosphate, TBP) immobilizing PVC cement (SIC) as a suitable adsorbent. The studied relevant factors affecting uranium adsorption onto SIC adsorbent involved; contact time, solution molarity, initial uranium concentration and temperature. The obtained adsorption isotherm of uranium onto the SIC adsorbent was fitted to Langmuir, Freundlich and Dubinin-Radushkviech (D-R) adsorption models. The results showed that the obtained equilibrium data fitted well the Langmuir isotherm. Additionally, it was found that the adsorption process obeys the pseudo second-order kinetic model. On the other hand, the calculated theoretical capacity of our prepared SIC adsorbent reached about 17 g U/kg SIC. Uranium adsorption from the studied raffinate solution was carried out applying the attained optimum conditions. The obtained data showed that 58.4 mg U/5 g SIC were adsorbed. However, using of 2 M HNO3 solution as an eluent, 93 (54.3 mg U) from the adsorbed amount were eluted.
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