ABSTRACT
The removal of radionuclide and toxic heavymetals such as uranium
and thorium from aqueous solutions, especially from contaminated
sources, seems to be a significantly useful subject for environmental
control and human health. It is well known that the radiation of
radioactive elements, such as uranium, thorium, and lanthanoids,
accompanies with nuclear explosion test and the accident of atomic
power plants.1 Fly ash contains considerably high amounts of
uranium (30 mgU/kg), and thorium (20 mgTh/kg) is radiated from
many thermal power stations.2 Furthermore, long-term and heavy
applications of phosphatic fertilizers mat result in an increase of
uranium, thorium, and lanthanoids levels in soils because phosphate
rock usually contains relatively high amounts of these elements.1
