Extraction of rare-earth elements from nitrate solutions by fullerene black impregnated with tetraphenylmethylenediphosphine dioxide

The distribution of trace amounts of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y nitrates between HNO3 aqueous solutions and fullerene black (a product of electric arc evaporation of graphite) impregnated with tetraphenylmethylenediphosphine dioxide (L) as a function of the concentrations of HNO3 in the aqueous phase and L in the sorbent phase was considered. It was shown that REE(III) ions pass into the sorbent phase in the form of Ln(NO3)(3)L-3 solvated nitrates; the efficiency of extraction of these ions decreases with an increase in the REE atomic number in the periodic table.