Uranium Extraction from Sea Water with Composite Adsorbents, (IV)

Uranium Adsorption on Composite Hydrous Titanium(IV)-Iron(II) Oxides Prepared by Precipitation from Homogeneous Solutions

抄録

Composite hydrous titanium(IV)-iron(II) oxides prepared by precipitation from homo-geneous solutions were studied with a view to developing magnetic adsorbents for uranium extraction from sea water.
Higher uranium adsorption capacity was registered with homogeneous than with het-erogeneous solution used for preparing the oxide. The adsorbents for uranium prepared from homogeneous solution moreover were found to require the copresence of urea and a suitable anion such as SO^2-₄, in order to provide strongly active adsorption of uranium.
The value of saturated magnetization of the composite hydrous oxides decreased with increasing titanium mole fraction up to 0.75, increase of the titanium mole fraction had, on the other hand, the effect of enhancing uranium adsorption capacity, which however sat-urated beyond 0.75 titanium mole fraction.
The change of enthalpy brought by the uranium adsorption on the composite hydrous titanium(IV)-iron(II) oxides was 10kcal/mol, and the amount of change independent of the conditions of precipitation.