Titanium-based adsorbent Fe-Ti-O was prepared by alkalinizing an equimolar mixed solution of TiCl4 and FeCl2 followed by heat treatment of its hydroxide. The prepared Fe-Ti-O adsorbent was found to the stable nonstoichiometric ferrous ferric titanium oxide with pseudobrookite and rutile structures. The Co(2+) adsorption characteristics of the adsorbent in high temperature water were investigated in a stirred autoclave. Co(2+) adsorption capacity of the Fe-Ti-O adsorbent was determined to the larger than that of TiO2 at high temperature. From this preliminary study, titanium-based oxides are shown to have good potential applicability for the reactor water purification as a high temperature adsorption media.