Uranium Adsorption with Composite Titanium-Iron Hydrous Oxide Microspheres

摘要

Microsphere type of composite hydrous titanium-iron oxides prepared by internal gelation method from homogeneous solutions were studied with a view to developing a better adsorbent for uranium recovery from seawater. Both uranium adsorption capacity and efficiency of the composite Ti-Fe hydrous oxide were enhanced with increasing iron weight content from 2% to 10%. The optimum uranium adsorption capacity and efficiency was obtained between 8.5% to 11.0% iron content. From the secondary electron image, rougher surface was observed in species prepared with 9.5% iron content than species prepared with 2.0% iron content. For a ten-days adsorption from natural seawater (3.18 ppB) in small column, the uranium uptake was 72 mu g U/g-Ad and the adsorption efficiency was about 22%. The change of enthalpy obtained by uranium adsorption on composite Ti-Fe hydrous oxide microspheres was 23.5 Kcal mol exp -1 . (ERA citation 11:019141)