Sorption of 131 I ! , 131 IO 3 ! , 137 Cs + , 85 Sr 2+ , and F ! ions on synthesized alkaline-earth (AE) (calcium, strontium, and barium) hydroxyphosphates was studied. These hydroxyphosphates were prepared by the reactions MCl 2 + Na 3 PO 4 + NaOH = M 5 (PO 4 ) 3 OH; MCl 2 + NH 4 OH + (NH 4 ) 2 HPO 4 = M 5 (PO 4 ) 3 OH; and MCl 2 + NaOH + (NH 4 ) 2 HPO 4 = M 5 (PO 4 ) 3 OH (M = Ca, Sr, Ba). All the tested AE hydroxyphosphates do not sorb ionic species of radioactive iodine from aqueous solutions. The highest sorption power with respect to fluoride ion is exhibited by calcium hydroxyphosphate. The degree of 137 Cs and 85 Sr sorption recovery from aqueous solutions upon their 120-min contact with AE hydroxyphosphates is~5325 and~15380%, respectively.
Sorption of 85 Sr, 137 Cs, 22 Na, and 152 Eu on solid mixed potassium neodymium ferrocyanide KNd[Fe(CN) 6 ] . 4H 2 O from neutral, acidic, and alkaline media and also coprecipitation of these radionuclides with KNd[Fe(CN) 6 ] . 4H 2 O in its formation from a homogeneous solution were studied. It was found that 85 Sr and 22 Na do not noticeably coprecipitate with solid KNd[Fe(CN) 6 ] . 4H 2 O and are not sorbed by this substance. In aqueous medium, depending on the cesium concentration in solution, from 80 to 98% of 137 Cs coprecipitates with solid KNd[Fe(CN) 6 ] . 4H 2 O. In this case, the distribution coefficient K d depends on both the cesium concentration in solution and solution pH. Within 30 min of contact of the solid and liquid phases, the degree of recovery of 137 Cs from aqueous solution with KNd[Fe(CN) 6 ] . 4H 2 O is approximately 95.0% of the initial amount. 152 Eu coprecipitates with solid KNd[Fe(CN) 6 ] . 4H 2 O during its formation from a homogeneous solution to 98399.9%. The degree of recovery of 152 Eu from aqueous solution with KNd[Fe(CN) 6 ] . 4H 2 O precipitate within 60 min of contact of the solid and liquid phases is 70.3% of the initial amount.
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