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Applications of core-shell Fe magnetic nanoparticles from used nuclear fuel recycling to groundwater remediation.

The unique properties of magnetic nanoparticles (MNPs), such as their extremely small size and high surface area to volume ratio, provide better kinetics for extracting metal ions from aqueous solutions. Here we demonstrated the separation of minor actinides using complex conjugates of MNPs with diethylenetriamine-pentaacetic acid (DTPA) chelator. The sorption results show the strong affinity of DTPA towards Am (III) and Pu (IV) by extracting 97% and 80% of actinides, respectively. If these long-term heat generating actinides can be efficiently removed from the used fuel raffinates, the volume of material that can be placed in a given amount of repository space can be significantly increased. Fe/Fe-oxide MNPs synthesized in our laboratory have showed the enhanced reactivity towards targeted contaminants due to the presence of zero valent iron (ZVI) protected by a passivated oxide shell. Physical and chemical characteristics of the shell surrounding the metallic iron core are likely to play an important role in determining the chemical reaction pathway taken place during the breakdown of carbon tetrachloride (CT). Reactivity results show that 80% of the degradation of CT resulted in the formation of dichloromethane and chloroform; compared to 20% of reactivity for commercial ZVI.

Maninder Kaur and You Qiang

Department of Physics, University of Idaho, Moscow, ID 83844 USA

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Title Annotation:56TH ANNUAL SYMPOSIUM OF THE IDAHO ACADEMY OF SCIENCE: THEME: ENERGY, MATERIALS, AND NANOTECHNOLOGY
Author:Kaur, Maninder; Qiang, You
Publication:Journal of the Idaho Academy of Science
Article Type:Author abstract
Date:Dec 1, 2014
Words:210
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