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Ce3+-enriched core–shell ceria nanoparticles for silicate adsorption

Published online by Cambridge University Press:  27 June 2017

Kijung Kim ,
Jihoon Seo ,
Myoungjae Lee ,
Jinok Moon ,
Kangchun Lee ,
Dong Kee Yi  and
Ungyu Paik
Kijung Kim
Affiliation:
Department of Nanoscale Semiconductor Engineering, Hanyang University, Seoul 04763, South Korea
Jihoon Seo
Affiliation:
Department of Energy Engineering, Hanyang University, Seoul 04763, South Korea
Myoungjae Lee
Affiliation:
Department of Nanoscale Semiconductor Engineering, Hanyang University, Seoul 04763, South Korea
Jinok Moon
Affiliation:
Department of Energy Engineering, Hanyang University, Seoul 04763, South Korea; and Clean/CMP Technology Team, Memory, Samsung Electronics, Gyeonggi-Do 16677, South Korea
Kangchun Lee
Affiliation:
Department of Energy Engineering, Hanyang University, Seoul 04763, South Korea
Dong Kee Yi*
Affiliation:
Department of Chemistry, Myongji University, Yongin 18448, South Korea
Ungyu Paik*
Affiliation:
Department of Nanoscale Semiconductor Engineering, Hanyang University, Seoul 04763, South Korea; and Department of Energy Engineering, Hanyang University, Seoul 04763, South Korea
*
a)Address all correspondence to these authors. e-mail: vitalis@mju.ac.kr
b)e-mail: upaik@hanyang.ac.kr
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Abstract

Ce3+ ions in ceria nanoparticles (NPs) play a role as reactive sites in the adsorption of silicate anions. However, the limited concentration of Ce3+ ions in ceria NPs remains a major challenge in this regard. Herein, we report a simple strategy to synthesize Ce3+-enriched core–shell ceria NPs for enhanced adsorption of silicate anions. To increase the overall Ce3+ concentration, a shell layer is composed of Ce3+-rich ultrasmall ceria NPs approximately 5 nm in size. The Ce3+ concentration of such core–shell ceria NPs is increased by 12.7–17.1% relative to that of the pristine ceria NPs, resulting in increased adsorption of silicate anions. The Freundlich model fits the observed adsorption isotherm well and the constants of adsorption capacity (KF) and adsorption intensity (1/n) indicate higher adsorption affinity of the core–shell ceria NPs for silicate anions. We attribute these improvements to the increased Ce3+ concentration contributed by the ultrasmall ceria coating. This strategy can be used for enhancing the reactivity of ceria materials.

Keywords

adsorptioncore/shellCMP
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 14 , 28 July 2017 , pp. 2829 - 2836
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Edson Roberto Leite

References

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