Extraction separation of Sr2+ from Ba2+ in the system cobalt dicarbollide-polyethylene glycol-nitrobenzene-CCl4-cyclohexaned iaminetetraacetate

Electrodriven Selective Transport of Cs+ Using Chlorinated Cobalt Dicarbollide in Polymer Inclusion Membrane: A Novel Approach for Cesium Removal from Simulated Nuclear Waste Solution

“…Presence of bulk concentration of Na + in the nuclear waste solution is the major challenge in recovery/removal of Cs + . Literature reports on separation of Cs from nuclear waste solutions include the use of number of techniques viz., precipitation with sodium phosphotungstic acid, ion exchange with silicotitanates, phosphomolybdates and solvent extraction using different macrocyclic ionophores, , protonated form of the hexachlorinated derivative of cobalt bis (dicarbollide) (HCCD). − The selective adsorption/extraction of Cs + over Na + using polyphenol enriched biomass based adsorbents or some macrocyclic carrier based solvent extraction methods has also been studied. − In order to achieve quantitative separation of Cs from nuclear waste solution, though, several solvents (nitrobenzene, FS-13) − and macrocyclic ionophores (bis­(octyloxy) calix[4]­arene-monocrown-6, calix[4]-bis-2,3-naptho-crown-6) , have been synthesized, but high cost of their synthesis and purification necessitates the need for exploring the methods which requires low ligand inventory. Other major disadvantage associated with the conventional separation methods (solvent extraction, ion exchange) is the generation of large amount of secondary waste.…”

“…charge compensation and selectivity can therefore be fulfilled by this single moiety (CCD – ). It is also reported to display good stability toward radiation . The solvent extraction of Cs + using protonated form of CCD – (HCCD) as extractant and trifluoromethylphenyl sulfone (FS-13) , or nitrobenzene as the solvent is well reported in literature.…”

“…It is also reported to display good stability toward radiation. 10 The solvent extraction of Cs + using protonated form of CCD − (HCCD) as extractant and trifluoromethylphenyl sulfone (FS-13) 12,14 or nitrobenzene 13 as the solvent is well reported in literature. Selective transport of cesium using HCCD in SLM have been reported with a decontamination factor (DF, defined as the ratio of product to impurity in the receiver divided by that in the feed) of ∼300 over different transition metal ions.…”