Abstract
(1) The adsorbing capacity for uranium shown by titanic acid prepared in homogeneous and acidic solution was found larger than titanic acid prepared in nonhomogeneous and neutral solution. The uranium adsorbed on titanic acid increased with rising temperature of sea-water. The adsorption reached equilibrium within 2 days. The concentration of uranium in the titanic acid was found experimentally to have a maximum value of U/Ti=1, 500μg/g.(2) The concentration of uranium adsorbed on the titanic acid at a given temperature was determined by the amount of sea-water and the concentration of uranium in seawater on the same titanic acid. An empirical formula was obtained for this relationship; the adsorption was applied to Freundlich's isotherm, and the distribution coefficients were found nearly constant within the range of sea-water volume covered by the present experiment.(3) The adsorption capacity was estimated from the term of multiplication of the distribution coefficient and the concentration of uranium in sea-water. The maximum value evaluated was U/Ti=4, 200μg/g, with the titanic acid prepared by hydrolysis.(4) The uranium adsorbed on the titanic acid increased with rising temperature of the sea-water, the empirical relationship being c=k exp (αtt2), (c: concn. of U, t: temp., k and α: const.).
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