Sorption of 90Sr onto Manganese Oxides Prepared in Aqueous-Ethanol Media

• Published in: Radiochemistry (New York, N.Y.) N.Y.), 2019, Vol.61 (6), p.707-713
• Main Authors: Ivanets, A. I., Milyutin, V. V., Prozorovich, V. G., Kuznetsova, T. F., Petrovskaya, A. O., Nekrasova, N. A.
• Format: Article
• Language: English
• Subjects: Calcium; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Ethanol; Heat treatment; Manganese oxides; Nuclear Chemistry; Pore size; Porosity; Potassium permanganate; Selectivity; Sol-gel processes; Sorbents; Sorption; Strontium 90; Synthesis
• ISSN: 1066-3622; 1608-3288
• DOI: 10.1134/S1066362219060110

Sorbents based on manganese oxides were prepared by KMnO 4 reduction in aqueous-ethanol medium. The influence of the synthesis conditions (temperature and time of the sol-gel synthesis, type of structure-forming cations, calcination temperature) on the pore structure and on the performance and selectivity in 90 Sr sorption was studied. The sorbents have the mesoporous structure with the specific surface area of 180–220 m 2 g −1 and mean pore size of 10–20 nm. Manganese oxide of channel structure in the Na + form, prepared by the reaction at 25°C for 5 h and heat-treated at 350°C, exhibits the highest performance and selectivity in 90 Sr sorption (distribution coefficient K d = 1.04 × 10 4 cm 3 g −1 , Sr-Ca separation factor D Sr/Ca = 99). The sorbents synthesized exhibit the highest performance and selectivity in neutral and alkaline media.