Synthesis of nuclear waste simulants by reaction precipitation: formation of caesium phosphomolybdate, zirconium molybdate and morphology modification with citratomolybdate complex

Paul, Neepa, Hammond, Robert B., Hunter, Timothy N., Edmondson, Michael, Maxwell, Lisa and Biggs, Simon (2015) Synthesis of nuclear waste simulants by reaction precipitation: formation of caesium phosphomolybdate, zirconium molybdate and morphology modification with citratomolybdate complex. Polyhedron, 89 129-141. doi:10.1016/j.poly.2014.12.030

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Author Paul, Neepa
Hammond, Robert B.
Hunter, Timothy N.
Edmondson, Michael
Maxwell, Lisa
Biggs, Simon
Title Synthesis of nuclear waste simulants by reaction precipitation: formation of caesium phosphomolybdate, zirconium molybdate and morphology modification with citratomolybdate complex
Journal name Polyhedron   Check publisher's open access policy
ISSN 0277-5387
Publication date 2015-03-29
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.poly.2014.12.030
Open Access Status DOI
Volume 89
Start page 129
End page 141
Total pages 13
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press [Elsevier]
Collection year 2016
Language eng
Formatted abstract
Caesium phosphomolybdate (Cs3PMo12O40·xH2O) and zirconium molybdate ([ZrMo2O7(OH)2]·2H2O) solids are known to precipitate out from highly active liquors (HAL) during reprocessing of spent nuclear fuel. Here, a new synthesis for these simulants is reported; with the initial step producing spherical ceasium phosphomolybdate particles, which can then be converted into cubic Zirconium molybdate. Additionally, the addition of citric acid prior to the formation of the zirconium salt is investigated. In this case, a citratomolybdate complex is generated, leading to the synthesis of elongated cuboidal zirconium citratomolybdate ([ZrMo2O7(OH)2]·2H2O·[(MoO2)2O(cit)2]). A key focus of this study is to explore the optimisation of reaction conditions to create a controlled environment for the particles to form with high conversion rates and with desired shape properties. Elemental and structural characterisation of the particles at various points during the synthesis, as well as post-synthesis, was undertaken to provide further insights. Ultimately, it is of importance to determine the mechanism of how these simulants are formed within the components in HAL. Establishing the influence of particle properties on HAL behaviour is key for current processing, post operational clean out (POCO) and life-time assessment of the nuclear waste facilities.
Keyword Caesium phosphomolybdate
Zirconium molybdate
Zirconium citratomolybdate
Nuclear waste
Inorganic compounds
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Faculty of Engineering, Architecture and Information Technology Publications
Official 2016 Collection
 
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Created: Wed, 26 Aug 2015, 11:47:56 EST by Anthony Yeates on behalf of Faculty Of Engineering, Architecture & Info Tech