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Porous Zr2SC-carbon composite microspheres: Possible radiation tolerant sorbents and transmutation hosts for technetium-99

Journal Article


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Abstract


  • The preparation, characteristics and adsorption properties of novel porous carbon-ceramic composite microspheres are presented. The composites were synthesised by a simple ion exchange process involving the cationic Zr tetramer and commonly-available macroporous sulphonated polystyrene-divinylbenzene cation exchange resins, with subsequent carbothermal reduction at 1350 °C. The materials were extensively characterised with respect to composition, chemical structure and porosity. Carbothermal reduction of the Zr-loaded templates resulted in formation of crystallites of the MAX phase zirconium sulphide carbide (Zr 2 SC) embedded within a highly microporous carbon framework with a macroporous secondary structure inherited from the resin template. Despite the high BET surface areas of the Zr 2 SC-carbon composite microspheres (in some cases, greater than 600 m 2 g −1 ), they are extremely mechanically robust. The microspheres displayed high adsorption selectivity for oxoanions relative to cationic solution species, including perrhenate (ReO 4 − ), a pertechnetate (TcO 4 − ) surrogate. Accumulation of ReO 4 − on the Zr 2 SC particles was unequivocally demonstrated by elemental mapping. Such materials are potential candidates as combined 99 Tc sorbents and reusable transmutation hosts.

Authors


  •   Scales, Nicholas (external author)
  •   Chen, Jun
  •   Aughterson, Robert (external author)
  •   Karatchevtseva, Inna (external author)
  •   Stopic, Attila (external author)
  •   Lumpkin, Gregory R. (external author)
  •   Luca, Vittorio (external author)

Publication Date


  • 2018

Citation


  • Scales, N., Chen, J., Aughterson, R. D., Karatchevtseva, I., Stopic, A., Lumpkin, G. R. & Luca, V. (2018). Porous Zr2SC-carbon composite microspheres: Possible radiation tolerant sorbents and transmutation hosts for technetium-99. Microporous and Mesoporous Materials, 259 67-78.

Scopus Eid


  • 2-s2.0-85030714534

Ro Full-text Url


  • https://ro.uow.edu.au/context/aiimpapers/article/3998/type/native/viewcontent

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2948

Has Global Citation Frequency


Number Of Pages


  • 11

Start Page


  • 67

End Page


  • 78

Volume


  • 259

Place Of Publication


  • Netherlands

Abstract


  • The preparation, characteristics and adsorption properties of novel porous carbon-ceramic composite microspheres are presented. The composites were synthesised by a simple ion exchange process involving the cationic Zr tetramer and commonly-available macroporous sulphonated polystyrene-divinylbenzene cation exchange resins, with subsequent carbothermal reduction at 1350 °C. The materials were extensively characterised with respect to composition, chemical structure and porosity. Carbothermal reduction of the Zr-loaded templates resulted in formation of crystallites of the MAX phase zirconium sulphide carbide (Zr 2 SC) embedded within a highly microporous carbon framework with a macroporous secondary structure inherited from the resin template. Despite the high BET surface areas of the Zr 2 SC-carbon composite microspheres (in some cases, greater than 600 m 2 g −1 ), they are extremely mechanically robust. The microspheres displayed high adsorption selectivity for oxoanions relative to cationic solution species, including perrhenate (ReO 4 − ), a pertechnetate (TcO 4 − ) surrogate. Accumulation of ReO 4 − on the Zr 2 SC particles was unequivocally demonstrated by elemental mapping. Such materials are potential candidates as combined 99 Tc sorbents and reusable transmutation hosts.

Authors


  •   Scales, Nicholas (external author)
  •   Chen, Jun
  •   Aughterson, Robert (external author)
  •   Karatchevtseva, Inna (external author)
  •   Stopic, Attila (external author)
  •   Lumpkin, Gregory R. (external author)
  •   Luca, Vittorio (external author)

Publication Date


  • 2018

Citation


  • Scales, N., Chen, J., Aughterson, R. D., Karatchevtseva, I., Stopic, A., Lumpkin, G. R. & Luca, V. (2018). Porous Zr2SC-carbon composite microspheres: Possible radiation tolerant sorbents and transmutation hosts for technetium-99. Microporous and Mesoporous Materials, 259 67-78.

Scopus Eid


  • 2-s2.0-85030714534

Ro Full-text Url


  • https://ro.uow.edu.au/context/aiimpapers/article/3998/type/native/viewcontent

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/2948

Has Global Citation Frequency


Number Of Pages


  • 11

Start Page


  • 67

End Page


  • 78

Volume


  • 259

Place Of Publication


  • Netherlands