Apr 18 – 23, 2010
Casino Conference Centre
UTC timezone

Radiation stability and extraction properties of thiacalixarenes

Apr 22, 2010, 5:30 AM
Red (Casino Conference Centre)


Casino Conference Centre

Reitenbergerova 4/95, Marianske Lazne, Czech Republic
Verbal Radiation Chemistry Radiation Chemistry


Irena Špendlíková (KJCH FJFI CVUT)


This study deals with the effects of irradiation on the stability and extraction properties of thiacalixarenes 1, the prospective liquid-liquid extractants for the extraction of actinides and lanthanides from aqueous solutions. Thiacalixarenes dissolved in various organic diluents were irradiated with 60Co γ rays or accelerated electrons with energy of 4.5 MeV. The absorbed doses ranged from 0 to 100 kGy. Possible effect of the presence of aqueous phase during irradiation was also investigated. The extraction properties were studied in synergistic systems. The aqueous phase consisted of a solution of cosane (chloro-protected bis(1,2-dicarbollide) cobaltic acid) in 0.1 mol/L nitric acid; solutions of thiacalixarenes in nitrobenzen or 1,2-dichlorethane were used as the organic phase. Distribution ratios D for 152Eu and 241Am and their mutual separation factors were evaluated. The concentration of thiacalixarene in the irradiated samples was measured using HPLC and the activity of aqueous and organic phase was measured by γ spectrometer with HPGe detector. The results confirmed previously published data 2 which showed a strong synergistic effect in the systems containing thiacalixarenes and cosanes. This effect depends on substituents at the lower and/or upper rim. It was demonstrated that the synergic effect is independent of the used type of cosane (chloro-, resp. bromo-protected bis(1,2-dicarbollide) cobaltic acid or bis(1,2-dicarbollide) cobaltic acid) and it strongly depends on the diluent used in the organic phase. The studied systems proved not to be very stable towards the radiation. After irradiation with the dose of 20 kGy, the distribution ratios dropped to one half for thicalixarene solutions in nitrobenzene; they dropped even to one tenth for dichlorethane solutions at the same dose. This work was performed under the auspices of Czech Science Foundation grant GACR 104-07-1242 and Ministry of Education, Youth and Sports grant MSM 6840770020. REFERENCES 1. Lhoták P.: Eur. J. Org. Chem. 8, 1675 (2004). 2. Kyrš M.: J. Radioanal. Nucl.Chem, 245, 455 (2002).

Primary author

Irena Špendlíková (KJCH FJFI CVUT)

Presentation materials

There are no materials yet.