Synthesis and spark plasma sintering of solid-state matrices based on calcium silicate for 60Co immobilization

An effective sorption material for the immobilization of cobalt radionuclides into highly safe and reliable solid-state matrices is proposed. The resulting silicate sorbent СaSiO3 had an amorphous mesoporous structure (ABET 53 m2/g) and a sorption capacity Co ions of 3.32 mmol/g. The physico-chemica...

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Published in:Journal of alloys and compounds 2022-08, Vol.912, p.165233, Article 165233
Main Authors: Shichalin, O.O., Yarusova, S.B., Ivanets, A.I., Papynov, E.K., Belov, A.A., Azon, S.A., Buravlev, I. Yu, Panasenko, A.E., Zadorozhny, P.A., Mayorov, V.Yu, Shlyk, D. Kh, Nepomnyushchaya, V.A., Kapustina, O.V., Ivanova, A.E., Buravleva, A.A., Merkulov, E.B., Gordienko, P.S.
Format: Article
Language:English
Subjects:
60Co immobilization
Calcium silicate
Calcium silicates
Co2+ adsorption
Cobalt
Compressive strength
Diamond pyramid hardness
Diffusion coefficient
Immobilization
Leaching
Radioisotopes
Silicate matrices
Solid state
Sorbents
Sorption
Spark plasma sintering
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Summary:An effective sorption material for the immobilization of cobalt radionuclides into highly safe and reliable solid-state matrices is proposed. The resulting silicate sorbent СaSiO3 had an amorphous mesoporous structure (ABET 53 m2/g) and a sorption capacity Co ions of 3.32 mmol/g. The physico-chemical characteristics of the СaCoSi2O6 sample obtained after Co2+ ions sorption were studied using XRD, N2 and Ar adsorption-desorption, SEM-EDX and TG/DTA methods. Solid-state silicate matrices characterized by high density values (2.86–3.16 g/cm3), compressive strength (150–637 MPa) and Vickers microhardness (1.80–5.25 GPa) were obtained by spark plasma sintering (SPS). The sample obtained at 1000 °C had the lowest values of Co2+ ions leaching (RCo ~10−7 g/(cm2×day)) and diffusion coefficient (De 1.73 ×10−17 cm2/s) from silicate matrices. Thus, the obtained СaCoSi2O6 silicate matrices saturated with Co ions comply with the regulatory requirements of GOST R 50926–96 and ANSI/ANS 16.1 for 60Co immobilization. •Amorphous CaSiO3 with 3.32 mmol/g Co ions sorption capacity was prepared.•SPS method allowed to obtain the CaCoSi2O6 matrices at 1000 °C for 2 min.•CaCoSi2O6 solid-state matrices exclude Co60 ions leaching and diffusion.•The characteristics of CaCoSi2O6 matrices exceeded the GOST and ANSI/ANS 16.1 requirements.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2022.165233