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나노물질 및 화학반응 연구단
나노물질 및 화학반응 연구단
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Selective separation and preconcentration of Th(iv) using organo-functionalized, hierarchically porous silica monoliths

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Title
Selective separation and preconcentration of Th(iv) using organo-functionalized, hierarchically porous silica monoliths
Author(s)
Yimu Hu; Simon Giret; Rafael Meinusch; Jongho Han; Fr´ed´eric-Georges Fontaine; Freddy Kleitz; Dominic Lariviere
Publication Date
2019-01
Journal
Journal of Materials Chemistry A, v.7, no.1, pp.289 - 302
Publisher
ROYAL SOC CHEMISTRY
Abstract
The potential application of thorium (Th) as nuclear fuel, as well as the environmental and public health concerns associated with it, promotes the development of economic and sustainable materials for the separation and removal of Th(iv) from minerals and environmental samples. In this work, centimeter-size, porous silica monoliths exhibiting hierarchical macroporosity-mesoporosity and a robust silica skeleton were prepared using a sol-gel process combined with post-synthetic hydrothermal treatment in ammonium hydroxide. Upon functionalization with diglycolamide (DGA), the resulting monolithic hybrid material was used as a column-type fixed bed sorbent for continuous flow extraction. An enhanced Th(iv) uptake from aqueous solution was achieved with a high enrichment factor and selectivity in the presence of competitive ions such as rare earth elements (REEs) and uranium (U). Systematic mechanistic studies show that the hierarchical pore system is crucial for enhanced adsorption kinetics and capacity. Two mineral leachates were used to assess the performances of the hybrid material, and despite the complex ion matrix and high ionic composition, the sorbent shows highly efficient recovery of Th(iv). The material was able to undergo 10 extraction-stripping-regeneration cycles, which bodes well for potential industrial applications. © 2019 The Royal Society of Chemistry
URI
https://pr.ibs.re.kr/handle/8788114/5599
ISSN
2050-7488
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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