Adsorption of radionuclides on oxide sorbents and impregnated porous membranes under high temperature conditions

The adsorption properties of hydrous titanium and zirconium oxides for Co(II) and other corrosion products have been studied under high temperature and pressure condition. The studies of dependence of distribution coefficients (Kd) on temperature indicate that Kd decreases with increasing temperature. The more negative enthalpy values for cobalt sorption at high temperature on oxide sorbents are connected with formation of spinel-type compounds like cobalt metatitanates. The sorption of radionuclides on oxide sorbents in column processes was studied under high temperature and pressure conditions, similar to those existing in the BWR recirculation loop. The column filled with TiO2aq. worked very effectively as both mechanical and ionic filter. Due to low mechanical stability of oxide sorbents, hydrous titanium oxide was incorporated into porous stainless steel membrane. The membranes impregnated with Ti02aq. are very efficient materials for sorption of radionuclides from aqueous solution, and can be used for removal of radioactive corrosion products in RWCU. (author). 11 refs, 6 figs, 10 tabs