Stability of composite polymeric beads containing a calix[4]arene-mono-crown-6 ligand for radio-cesium separation

•Removal of radioactive Cs from high level waste (HLW) will help in HLW management.•In HLW the separation of cesium is extremely challenging.•Bis-octyloxy-calix[4]arene-mono-crown-6 is highly selective for Cs over Na and K.•Use of exotic ligands in chromatography is a good choice due to low ligand i...

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Bibliographic Details
Published in:Journal of Chromatography A 2022-10, Vol.1681, p.463488, Article 463488
Main Authors: Gujar, Rajesh B., Ansari, Seraj A., Mohapatra, Prasanta K.
Format: Article
Language:English
Subjects:
Calixcrown
Cesium
Chromatography
Composite bead
Sorption
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Summary:•Removal of radioactive Cs from high level waste (HLW) will help in HLW management.•In HLW the separation of cesium is extremely challenging.•Bis-octyloxy-calix[4]arene-mono-crown-6 is highly selective for Cs over Na and K.•Use of exotic ligands in chromatography is a good choice due to low ligand inventory.•Preparation of stable BOCMC/IL/PS beads for Cs recover has been reported. Bis-octyloxy-calix[4]arene-mono-crown-6 (BOCMC) is a selective ligand for Cs(I) cation, and has been used in solvent extraction method for its separation from acidic feed. Looking at the various advantages and ease of extraction chromatography separation method, an attempt was made to prepare stable composite beads containing BOCMC entrapped in a suitable polymeric matrix. Therefore, an attempt was made to prepare a series of composite polymeric beads containing BOCMC in polysulfone (PS), polyether sulfone (PES) and sodium alginate polymeric matrix. Preparations of the beads were attempted by dissolving the solid BOCMC in the polymer solution, and also by using the ligand solution in isodecanol/dodecane and ionic liquids and then mixing in the polymeric solution. Every attempt failed to get the desired quality of beads in PES and sodium alginate matrix. However, very good quality and stable beads were obtained when 25 mM ligand solution dissolved in C8mim.Tf2N ionic liquid was used in PS matrix. Detail study for the extraction chromatography separation of Cs(I) was studied with BOCMC/C8mim.Tf2N/PS composite beads. Detail investigations on the preparation, characterization, reusability and radiation stability of these beads have been studied and reported in details.
ISSN:0021-9673
DOI:10.1016/j.chroma.2022.463488