Uranium(VI) sorption onto goethite and silica: effect of ionic strength and carbonate

U(VI) sorption onto geological material was studied by using TLM(Tripple Layer Model). Effect of ionic strength was insignificant at goethite. We explained the effect of ionic strength on U(VI) sorption by adapting experimental results of U(VI) sorption onto goethite to TLM. Independency of ionic strength suggested that goethite adsorbed U(VI) strongly at inner-sphere from the results of FITEQL simulation. U(VI) sorption onto silica showed the carbonate effect on sorption characteristics of U(VI). It was strongly indicated that U(VI) could be existed in the forms of aqueous carbonate species in the solution. Therefore carbonate had a great effect on U(VI) migration