137Cs, 85Sr and 60Co sorption from model solutions of low activity liquid radioactive waste by modified oil shale

The results of the study of cesium, strontium, cobalt radionuclides sorption from model solutions simulating liquid radioactive waste on promising sorbents based on thermally modified oil shale are presented. The dependency of texture parameters obtained from the results of nitrogen adsorption-desorption on the treatment method of oil shale and their relationship to sorption parameters such as distribution coefficient and removal efficiency was discussed. Understanding how pore characteristics affect the sorption activity of such complex systems as sorbents is important for the creation of radionuclide sorption materials with improved characteristics. The efficiency of sorption of cesium, strontium and cobalt radionuclides was rather high for sorbent samples: the distribution coefficient was about 103–104 ml/g with a removal efficiency of more than 66 %. The most effective sorbent was obtained from oil shale with a heating rate of 5 deg/min without subsequent steam treatment, which is recommended to be used for low-active radioactive waste treatment.

1. Ryabchikov B. E. Liquid radioactive waste treatment. Moscow, DeLi print Publ., 2008. 516 p. (in Russian).

2. Milyutin V. V., Nekrasova N. A., Firsova L. A., Kozlitin E. A. Sorption technology in modern applied radiochemistry. Sorbcionnye i hromatograficheskie processy = Sorption and chromatographic processes, 2016, vol. 16, no. 3, pp. 313–322 (in Russian).

3. IAEA-TCS-27. Technological and organizational aspects of radioactive waste management. A series of training courses. Vienna, IAEA, 2005. 221 p. (in Russian).

4. Klyuchnikov A. A., Pazuhin E. M., Shigera Yu. M., Shigera V. Yu. Radioactive waste of nuclear power plants and methods for their management. Chernobyl, Institute for NPP Safety Problems of the National Academy of Sciences of Ukraine, 2005. 487 p. (in Russian).

5. Lishtvan I. I., Dudarchik V. M., Kraiko V. M. Solid fossil fuels of Belarus and features of their deep processing. Doklady Natsyyanal'nai akademii navuk Belarusi = Reports of the National Academy of Sciences of Belarus, 2015, vol. 59, no. 3, pp. 97–101 (in Russian).

6. Peshchenko A. D., Mychko D. I. Oil shales of Belarus: resources and prospects for use. Himiya: prablemy vykladannya [Chemistry: teaching issues], 2011, no. 8, pp. 3–13 (in Russian).

7. Kasar S., Kumar S., Kar A., Bajpai R.K., Kaushik C. P., Tomar B. S. Retention behavior of Cs(I), Sr(II), Tc(VII) and Np(V) on smectite-rich clay. Journal of Radioanalytical and Nuclear Chemistry, 2014. vol. 300, no. 1, pp. 71–75. https://doi.org/10.1007/s10967-014-2943-2

8. Lishtvan P. L., Falyushin P. L., Dudarchik V. M., Kraiko V. M. Qualitative parameters of oil shale. Prirodopolzovanie = Nature management, 2012. vol. 22, no. 1, pp. 219–226 (in Russian).

9. Gorkii Y. I., Lukyanova Z. K., Stelmah, G. P. Yaremenko, I. A. Problems of the complex use of oil shale of the Belarusian SSR. Minsk, Nauka i tekhnika Publ., 1983. 104 p. (in Russian).

10. Koren'kova O. B., Radkevich A. V., Toropova V. V., Saskovec V. V., Shcheblecova A. N., Kuznecova T. F., Ivanec A. I. Sorption of radionuclides 137Cs, 60Co, and 85Sr from aqueous solutions with heat treated oil shale. Radiohimiya = Radiochemistry, 2021, vol. 63, no. 5, pp. 606–612. https://doi.org/10.1134/s1066362221050088

11. Myasoedova G. V., Nikashina V. A. Sorption materials for the extraction of radionuclides from aqueous media. Rossiiskii Himicheskii Zhurnal = Russian Chemical Journal, 2006, vol. 50, no 5, pp. 55–63 (in Russian).

12. Grushicheva E. A., Bogdanovich N. G., Emelyanov V. P., Petruhina G. N., Starkov O. V. Inorganic sorbents: sorption properties of natural silicates. Sorbcionnye i hromatograficheskie processy = Sorption and chromatographic processes, 2006. vol. 6, no. 6, pp. 922–927 (in Russian).

13. Nishi Y., Inagaki M. Gas adsorption/desorption isotherm for pore structure characterization. Materials Science and Engineering of Carbon, 2016, pp. 227–247. https://doi.org/10.1016/b978-0-12-805256-3.00011-8

14. Subhabrata R., Gargi D. Adsorption. Process Equipment and Plant Design. Principles and Practices, 2020, pp. 351–384. https://doi.org/10.1016/b978-0-12-814885-3.00012-9

15. Kutarov V. V., Tarasevich Yu. I., Aksenenko E. V., Ivanova Z. G. Adsorption hysteresis for the model of slit pores. Russian Journal of Physical Chemistry A, 2011, vol. 85, no. 7, pp. 1222–1227. https://doi.org/10.1134/s0036024411070193

16. Vyacheslavov A. S., Pomerantseva E. A. Measurement of surface area and porosity by the method of capillary condensation of nitrogen: methodological development. Moscow, Moscow State University, 2006. 55 p. (in Russian).