In one aspect, the technology relates to a method of producing Ac, the method including preparing a phosphate-modified titania material to produce an ion-exchange material, contacting a solution including .sup.229Th with the ion-exchange material to produce a Th-loaded titania material, eluting the Th-loaded titania material with a wash solution to produce an eluted solution containing eluted compounds including .sup.225Ac, concentrating the eluted solution to generate eluted compounds including the .sup.225Ac, and separating the .sup.225Ac from the eluted compounds.

The invention relates to an organic-inorganic hybrid material which comprises an inorganic solid support on which are grafted organic molecules of the general formula (I) hereafter: ##STR00001##
and relates to methods allowing preparation of this hybrid material as well as to the uses of the hybrid material for extracting uranium(VI) from an aqueous medium comprising phosphoric acid.

In one aspect, the technology relates to a method of producing Ac, the method including preparing a phosphate-modified titania material to produce an ion-exchange material, contacting a solution including .sup.229Th with the ion-exchange material to produce a Th-loaded titania material, eluting the Th-loaded titania material with a wash solution to produce an eluted solution containing eluted compounds including .sup.225Ac, concentrating the eluted solution to generate eluted compounds including the .sup.225Ac, and separating the .sup.225Ac from the eluted compounds.