Ectraction of uranyl ions from aqueous solutions using silica-gel-bound macrocycles for alpha contaminated waste water treatment

摘要

The efficiency for the extraction of U(VI)of new modified silica gels,namely N-tripropinate (or N-triacetate)_substituted tetraazamacrocycles-bound cilica gels,has been studied.the effect of the nature of the ligand,the ph and the temperature was studied both in batch experiments as well as in continuous extraction.These silica gels are good candidates for the extraction of U(VI)when compared to a commercially available acid-type chelating resin.the breakthrough and egeneration tests showed that athe total removal of U(VI)from a contaminated solutin can be achieved by susing a column packed with such tetraazamacrocycles-bound silica gels.inaly,the use of a modified silica gel in a pilot device allowed the total decontamination of 50 m~3 of real effuents otaining traces of uranium,plutonium,and americium.