Sorption of cesium radionuclides onto semicrystalline alkali metal silicotitanates

Autor: V. V. Milyutin, A. I. Bortun, T. S. Psareva, T. A. Shaposhnikova, V. V. Strelko, V. G. Mil’grandt, V. M. Gelis, I.Z. Zhuravlev
Rok vydání: 2015
Předmět:
Zdroj: Radiochemistry. 57:73-78
ISSN: 1608-3288
1066-3622
Popis: Sorption of microamounts of 137Cs from solutions of various compositions onto semicrystalline alkali metal silicotitanates (TiSi) was studied. The pore structure analysis showed that the TiSi samples formed under the conditions of the experiments had bimodal nanoporosity characterized by the presence of ultramicropores (r ≈0.4–1.0 nm) and transport mesopores (r ≈2.5–30 nm). Potentiometric titration showed that TiSi contained acidic protonogenic groups with pKa ≈1.5–2.5, suggesting the possibility of ion-exchange sorption of alkali metal cations from acid solutions. A study of the 137Cs distribution coefficient on TiSi as a function of the concentrations of sodium, potassium, and ammonium nitrates showed that the cations can be ranked in the following order with respect to the effect on the cesium sorption: Na+ < K+ < NH4+. As demonstrated by experiments on the 137Cs removal from simulated bottom residue of nuclear power plants and on treatment of liquid radioactive waste from the Shelter Object of the Chernobyl NPP, semicrystalline alkali metal silicotitanates exhibit high sorption ability and selectivity with respect to 137Cs and can be used for removing cesium from multicomponent salt solutions.
Databáze: OpenAIRE
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