New isopolyoxomolybdates derived from heptamolybdate with UO 2 2 + and Th 4 + ions

Uranyl (UO2 2+ ) and thorium (Th 4+ ) polyoxomolybdates, containing strictly [Mo7O24] 6entity, have been synthesized by self-assembly from raw materials as Na2MoO4•2H2O, uranyl acetate and thorium nitrate in acidic media under controlled conditions of temperature and pH. Although some polyoxometalates derived from heptamolybdate ([Mo7O24] 6) presently are known, the novelty of this work derives from the fact that for the newly synthesized units accomplishments for their chemical characterization was foreseen through the data obtained by the mean of state of art technique as Fourier Transformed Infrared Spectroscopy (FTIR), UV-vis spectrophotometry, scanning electronic microscopy (SEM) with electron diffraction X-ray (EDX) detection, and thermogravimetric analysis. Our work reveals that all the polyoxomolybdates containing the [Mo7O24] 6unit might have reduced retaining properties when compared with the polyoxomolybdate including in its structure the [Mo4O13] 2unit. The polyoxomolybdate containing the [Mo7O24] 6entity can be used in the synthesis process of raw materials with direct application in the concentration/preconcentration of radioactive cations including UO2 2+ and Th 4+ from aqueous solution.