Sorption of cesium on finely dispersed composite ferrocyanide sorbents

The use of composite ferrocyanide materials for treatment of high salinity liquid radioactive wastes rich in cesium isotopes

“…In this case, best performance was achieved with copper and nickel ferrocyanides, which showed an order of magnitude greater d for cesium, than cobalt ferrocyanide (Table 2a and b). These results are consistent with previous studies [6,8,[20][21][22], e.g. Sirakanyan et al [14] observed a similar trend for the adsorption of cesium using different ferrocyanides.…”

“…Precipitates of pure ferrocyanides of heavy metals, despite their high affinity towards cesium, are soluble in alkaline solutions and are inclined to peptization. Milyutin et al however note the improved sorptive performance of nickel potassium ferrocyanide in alkaline media when precipitated onto a mineral support (which these authors attributed to the formation of a nickel potassium ferrocyanide phase firmly fixed on the support surface, which is resistant to peptization) [8].…”

“…For example, recent research has targeted agricultural residues [10], pure ferrocyanides [8,9], their polymeric composites [11,12], nanofibers, nanofilms [13,14], powdered activated carbon [15] etc. However, the proposed sorption materials have a number of deficiencies which have limited their widespread implementation in practice.…”

“…For the processing of concentrated LRW with a high content of nitrates and borates in the Loviisa NPP (Finland) and the Paks NPP (Hungary) precipitation is used to remove borate salts followed by further purification via removal of cesium ions using sorbents based on cobalt ferrocyanide. Copper and nickel ferrocyanides have also been applied as separation media [6][7][8].…”

Liquid Radioactive Wastes Treatment: A Review

“…Finally the sorption behavior of Cs onto the prepared material was tested, it was found that the material exhibit high Cs removal ability and high distribution coefficient under high acidity and salinity conditions. Also, the feasibility of using potassium cobalt hexacyanoferrate (PCH)/SiO 2 composite as a granulated inorganic adsorbent to remove Cs from the radioactive waste solution was recently studied [28]. The PCH particles were prepared then they were stabilized into in situ-generated porous silica with aqueous silica sol used as SiO 2 source.…”