Extraction behavior of cesium and some typical fission and non-fission products with a new 1,3-di(1-decyloxy)-2,4-crown-6-calix[4]arene

Abstract

A new macrocyclic supramolecular recognition agent, 1,3-di(1-decyloxy)-2,4-crown-6-calix[4]arene (DecylCalix[4]C6), was synthesized by a multistep reaction through separation and purification by column chromatography packed with silica gel. The extraction behavior of some representative fission and non-fission products such as La(III), Y(III), Cs(I), Rb(I), Pd(II), Mo(VI), Zr(IV), Sr(II), Ba(II), Ru(III), Na(I), and K(I), which were contained in highly active liquid waste (HLW), with DecylCalix[4]C6/1-octanol in HNO 3 medium was investigated, in particular by examining the impact of contact time, the HNO 3 concentration in the range of 0.4 to 5.0 M, and the temperature. DecylCalix[4]C6 showed excellent extraction ability and high selectivity for Cs(I) over the tested metals except for Rb(I). It was attributed to the effective recognition and complxation of DecylCalix[4]C6 for Cs(I). The optimum HNO 3 concentration for the Cs(I) extraction was 3.0 M. The composition of the extracted species of Cs(I) with DecylCalix[4]C6 was determined to be (CsDecylCalix [4]C6)NO 3 . It is valuable for the effective partitioning of Cs(I) from highly active liquid waste with DecylCalix[4]C6 by liquid-liquid solvent extraction.

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.…”

Adsorption of 137Cs on titanium ferrocyanide and transformation of the sorbent to lithium titanate: a new method for long term immobilization of 137Cs

“…Solvent extraction is an option for 137 Cs removal, but this technique has several shortcomings, e.g. extraction coefficients for cesium are relatively small and process needs huge volumes of solvents and stripping agents [ 1 , 2 ]. Precipitation has been applied in few works, however, the higher pH values typically associated with precipitation methods often result in the precipitation of macro quantities of metals necessitating further separation or decontamination process steps [ 3 ].…”