Hydrothermal Synthesis of Potassium Titanate Powders in Sub/Supercritical Water and Its Cobalt Ion Sorption Properties
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Hydrothermal synthesis of potassium titanate powders was carried out under various subcritical and supercritical water conditions (473-723 K) using titanium tetraisopropoxide and aqueous KOH solutions as starting materials. A single phase of K<SUB>2</SUB>Ti<SUB>6</SUB>O<SUB>13</SUB> was formed at 573 K or higher, whereas unidentified phase was obtained at 473K. In this paper, the hydrothermally synthesized potassium titanates powders were used for cobalt ion adsorbent under hydrothermal conditions. Co uptake on the hydrothermally synthesized K<SUB>2</SUB>Ti<SUB>6</SUB>O<SUB>13</SUB> was over 2x10<SUP>-3</SUP> molg<SUP>-1</SUP> at 473 K, whereas those at 373 K were lower in comparison with the solid state synthesized K<SUB>2</SUB>Ti<SUB>6</SUB>O<SUB>13</SUB>. Cobalt ions can be adsorbed as Co<SUB>3</SUB>O<SUB>4</SUB> accompanied by the structure transformation from K<SUB>2</SUB>Ti<SUB>6</SUB>O<SUB>13</SUB> to anatase under hydrothermal conditions.
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