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Sorption of Nuclear Waste Components by Layered Hydrazinium Titanate: a Straightforward Route to Durable Ceramic Forms

Published online by Cambridge University Press:  23 March 2012

Sergey N. Britvin ,
Yulia I. Korneyko ,
Boris E. Burakov ,
Andriy Lotnyk ,
Lorenz Kienle ,
Wulf Depmeier  and
Sergey V. Krivovichev
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
Yulia I. Korneyko
Affiliation:
V.G. Khlopin Radium Institute, 28, 2-nd Murinskiy Ave., St. Petersburg, 194021, 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; Nanomaterials Research Center, Kola Science Center RAN, Fersman Str. 20, 184200 Apatity, Murmansk Region, Russia
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Abstract

Layered hydrazinium titanate LHT-9, (N2H5)1/2Ti1.87O4 is a new nanohybrid material related to lepidocrocite-type titanates. Unique combination of ion exchange, reductive properties, surface activity due to Brønsted acid sites and occurrence of surface titanyl groups allows exploring LHT-9 for simultaneous uptake of almost all components of liquid nuclear wastes. LHT-9 irreversibly removes technetium, molybdenum, palladium and selenium from their aqueous solutions by specific mechanism of reductive adsorption. For removal of cesium, strontium, transition elements, actinides and lanthanides LHT-9 provides mechanisms of ion exchange and surface complexation. Products of adsorption are nanocrystalline and homogeneous powders loaded with 5 to 15 wt. % of radionuclides and non-radioactive elements. LHT-9 can be applied as ready-to-use precursor for one-step synthesis of durable titanate ceramic waste forms similar to SYNROC. An essential advantage of LHT-9 in comparison with other titanate sorbents (monosodium titanate and peroxo-titanate materials) is the absence of Na in its composition that permits arbitrary tailoring of sorbent properties by simple pre-treatment with the desired elements. Results on sorption of americium, cesium, strontium and lanthanides by LHT-9 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-o46
Copyright
Copyright © Materials Research Society 2012

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References

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