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Crystalline Titanate Ceramic for Immobilization of Tc-99

Published online by Cambridge University Press:  23 March 2012

Yulia I. Korneyko ,
Sergey N. Britvin ,
Boris E. Burakov ,
Andriy Lotnyk ,
Lorenz Kienle ,
Wulf Depmeier  and
Sergey V. Krivovichev
Yulia I. Korneyko
Affiliation:
V.G. Khlopin Radium Institute, 28, 2-nd Murinskiy Ave., St. Petersburg, 194021, Russia
Sergey N. Britvin
Affiliation:
Department of Crystallography, Geological Faculty, St. Petersburg State University, Universitetskaya Nab. 7/9, 199034 St. Petersburg, Russia Nanomaterials Research Center, Kola Science Center RAN, Fersman Str. 20, 184200 Apatity, Murmansk Region, Russia
Boris E. Burakov
Affiliation:
V.G. Khlopin Radium Institute, 28, 2-nd Murinskiy Ave., St. Petersburg, 194021, Russia
Andriy Lotnyk
Affiliation:
Institute for Material Science, Synthesis and Real Structure, University Kiel, Kaiserstr. 2, 24143 Kiel, Germany
Lorenz Kienle
Affiliation:
Institute for Material Science, Synthesis and Real Structure, University Kiel, Kaiserstr. 2, 24143 Kiel, Germany
Wulf Depmeier
Affiliation:
Institute for Geosciences, University Kiel, Olshausenstr. 40, 24118 Kiel, Germany
Sergey V. Krivovichev
Affiliation:
Department of Crystallography, Geological Faculty, St. Petersburg State University, Universitetskaya Nab. 7/9, 199034 St. Petersburg, Russia
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Abstract

Technetium-99 is considered as one of the most dangerous nuclear environmental pollutants due to its long half-life (210,000 y.) and high mobility in aqueous solutions under oxidizing conditions. Development of sorbents, which are capable of irreversible uptake of Tc and further direct conversion into durable ceramic waste forms, is an important field of research. Titanate ceramic doped with up to 10 wt. % Tc was successfully synthesized using Layered Hydrazinium Titanate, LHT-9 (PCT/EP2010/001864) as starting precursor. LHT-9 is a new advanced compound of general formula (N2H5)1/2Ti1.87O4xH2O containing 6-7 wt. % of hydrazine chemically incorporated into a TiO2-based matrix. It was demonstrated that LHT-9 (5g/l) can reductively adsorb up to 90.2 wt. % of Tc from aqueous solutions containing 0.5g Tc/l. The obtained adsorption products can be easily converted into stable titanate ceramic by one-step sintering in argon atmosphere at 1200°C. Phase and chemical composition of synthesized Tc-doped ceramic are discussed.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1475: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV , 2012 , imrc11-1475-nw35-o44
Copyright
Copyright © Materials Research Society 2012

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References

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