Hydrous Titanium Oxide Ion Exchanger, (I)

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  • INOUE Yasushi
    Department of Nuclear Engineering, Faculty of Engineering, Tohoku University
  • TSUJI Masamichi
    Department of Nuclear Engineering, Faculty of Engineering, Tohoku University

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  • Method of Synthesis and Some Properties

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Synthesis of hydrous titanium oxide ion exchanger was tried from three systems: (a) TiCl4-NaOH-H2O, (b) ATS (ammonium titanyl sulphate monohydrate)-NaOH-H2O and (c) TiCl4-NH4OH-H2O. The first method gave the best results under the conditions covered in the present work.<BR>It was found that repeated washing and aging of the hydrous titanium oxide pre-cipitate were indispensable in order to obtain reproducible results, and that this operation further obviated the need of precisely adjusting the conditions for mixing the reagents.<BR>Both the yield of exchanger and the ion exchange capacity of the resulting product increase with concentration of the reagents. A cation exchange capacity of about 3 meq•Na+/g could be obtained, which is considerably higher than any corresponding value reported in literature. The value decreased with increasing drying temperature. Irre-spectively of the conditions of synthesis, the chemical composition was TiO2(2.02.2) H2O, and the impurities contained in the product were found to be less than 0.1w/o.<BR>The exchanger produced is in granular form suitable for use in column operation. It is fairly stable in alkaline solution, and also in mineral acid solutions of <0.1 N concentration.

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