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From the first issue of 2016, Chromatography has changed its name to Separations.

Open AccessArticle
Chromatography 2015, 2(3), 545-566; doi:10.3390/chromatography2030545

Synthetic Smectite Colloids: Characterization of Nanoparticles after Co-Precipitation in the Presence of Lanthanides and Tetravalent Elements (Zr, Th)

Karlsruhe Institute of Technology (KIT) - Campus North (CN), Institute for Nuclear Waste Disposal (INE), Hermann-von Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Ronald Beckett
Received: 28 May 2015 / Revised: 21 July 2015 / Accepted: 31 July 2015 / Published: 1 September 2015
(This article belongs to the Special Issue Field-Flow Fractionation)
View Full-Text   |   Download PDF [1853 KB, uploaded 1 September 2015]   |  

Abstract

The magnesian smectite hectorite is a corrosion product frequently detected in nuclear waste glass alteration experiments. The structural incorporation of a single trivalent lanthanide was previously demonstrated. Hectorite was presently synthesized, for the first time, in the presence of several lanthanides (La, Eu, Yb) following a multi-step synthesis protocol. The smallest-sized particles (nanoparticles, NPs) were isolated by centrifugation and analyzed by asymmetrical flow field-flow fractionation (AsFlFFF) coupled to ICP-MS, in order to obtain information on the elemental composition and distribution as a function of the size. Nanoparticles can be separated from the bulk smectite phase. The particles are able to accommodate even the larger-sized lanthanides such as La, however, with lower efficiency. We, therefore, assume that the incorporation proceeds by substitution for octahedral Mg accompanied by a concomitant lattice strain that increases with the size of the lanthanides. The presence of a mixture does not seem to affect the incorporation extent of any specific element. Furthermore, syntheses were performed where in addition the tetravalent zirconium or thorium elements were admixed, as this oxidation state may prevail for many actinide ions in a nuclear waste repository. The results show that they can be incorporated as well. View Full-Text
Keywords: smectite; radionuclides; incorporation; flow field-flow fractionation; ICP-MS; nanoparticles; clay smectite; radionuclides; incorporation; flow field-flow fractionation; ICP-MS; nanoparticles; clay
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MDPI and ACS Style

Bouby, M.; Finck, N.; Geckeis, H. Synthetic Smectite Colloids: Characterization of Nanoparticles after Co-Precipitation in the Presence of Lanthanides and Tetravalent Elements (Zr, Th). Chromatography 2015, 2, 545-566.

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