PREPARATION OF ALKYLAMINE INTERCALATED FIBROUS CERIUM HYDROGENPHOSPHATE COMPLEXES AND THEIR COBALT ION ADSORPTION PROPERTIES UNDER HYDROTHERMAL CONDITIONS

Alkylamine intercalated fibrous cerium hydrogenphosphate complexes wer e prepared and their cobalt ion adsorption properties were examined un der hydrothermal conditions to develop the adsorbent for removal of ra dioactive corrosion products in nuclear reactor. X-Ray powder diffract ion patterns of the complexes suggested that the alkylamine bilayer an d alpha, omega-alkanediamine monolayer were constructed between the in terlayer space of the cerium hydrogenphosphate. Cobalt ion uptake incr eased with the addition of amino groups up to the cation exchange capa city of the fibrous cerium hydrogenphosphate and the saturated uptake amount increased with the following order; octylamine complex>octameth ylenediamine complex>dodecamethylenediamine complex>dodecylamine compl ex. The cobalt ion uptake was achieved by the octylamine and octamethy lenediamine complexes under hydrothermal conditions. X-Ray diffractome try revealed that cerium orthophosphate phase was formed without any c obalt compound. As the atomic ratios of P/Ce and Co/Ce had a linear re lationship, cobalt ions are incorporated into a cerium orthophosphate compound (Ce1-xCox)PO4 accompanied by the reduction of cerium and the structural change of the complexes under hydrothermal conditions.