The collection of uranium from sea water with hydrous metal oxide. II. The mechanism of uranium adsorption on hydrous titanium (IV) oxide.
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概要
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The mechanism of uranium adsorption from sea water by hydrous titanium(IV) oxide was investigated. The uranium adsorption experiments were conducted using a solution containing NaCl, NaHCO<SUB>3</SUB>, and uranium. Thermochemical calculation showed that the tris(carbonato)dioxouranate(VI) ion [UO<SUB>2</SUB>(CO<SUB>3</SUB>)<SUB>3</SUB>]<SUP>4−</SUP> found in sea water existed in the solution at pH 8 and 25 °C. The uranium uptake varied with the pH of the solution, exhibiting a minimum value at pH 8. The enthalpy change, Δ<I>H</I>, and the activation energy, <I>E</I>, of the uranium adsorption were found to be 23.6 kJ mol<SUP>−1</SUP> and 52.7 kJ mol<SUP>−1</SUP> respectively. The analysis of carbonate in the adsorbent showed that the carbonate ion in [UO<SUB>2</SUB>(CO<SUB>3</SUB>)<SUB>3</SUB>]<SUP>4−</SUP> was released into the solution during the uranium adsorption. On the basis of the present experimental results, the mechanism of uranium adsorption was discussed.
- 公益社団法人 日本化学会の論文
著者
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NAKAJIMA Fumito
Hitachi Research Laboratory, Hitachi Ltd.
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OZAWA Yoshihiro
Energy Research Laboratory, Hitachi Ltd.
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MURATA Toshifumi
Energy Research Laboratory, Hitachi Ltd.
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YAMASHITA Hisao
Hitachi Research Laboratory, Hitachi Ltd.
関連論文
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- The collection of uranium from sea water with hydrous metal oxide. II. The mechanism of uranium adsorption on hydrous titanium (IV) oxide.
- Uranium extraction from sea water with composite adsorbents. II. Uranium adsorption on composite hydrous titanium(IV)-iron(II) oxide.:Uranium Adsorption on Composite Hydrous Titanium (IV) -Iron (II) Oxide
- 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.:Uranium Adsorption on Composite Hydrous Titanium(IV)-Iron(II) Oxide
- The collection of uranium from sea water with hydrous metal oxide. IV. Physical properties and uranium adsorption of hydrous titanium(IV) oxide.
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