ADSORPTION BEHAVIOR OF COBALT( II) IONS ON LAYERED DIHYDROGEN TETRATITANATE HYDRATE FIBERS IN AQUEOUS SOLUTIONS IN THE RANGE FROM 298 to 523 K

Abstract The adsorption properties of cobalt(II) ions have been studied on layered dihydrogen tetratitanate hydrate fibers, H2Ti4O9,•nH2O, in the temperature range from 298 to 523 K. The distribution coefficients of the adsorption of cobalt (II) ions were increased with increasing temperatures up to 367 K, but were decreased in the temperature range between 367 and 523 K. The X-ray powder diffraction patterns of the fibers indicate that the fibers hold layer structure up to 367 K, but change to low crystalline anatase or its precursor above that temperature. It is notable that the material has the capability of cobalt (II) adsorption even at 523 K, although the maximum is present at 367 K.