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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 K2Ti6O13 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 K2Ti6O13 was over 2x10-3 molg-1 at 473 K, whereas those at 373 K were lower in comparison with the solid state synthesized K2Ti6O13. Cobalt ions can be adsorbed as Co3O4 accompanied by the structure transformation from K2Ti6O13 to anatase under hydrothermal conditions.

Hydrothermal Synthesis of Potassium Titanate Powders in Sub/Supercritical Water and Its Cobalt Ion Sorption Properties