Improved Oxidase Mimetic Activity by Praseodymium Incorporation into Ceria Nanocubes

ACS Applied Materials & Interfaces
Lei JiangXiaowei Chen

Abstract

Ceria nanocubes (NC) modified with increasing concentrations of praseodymium (5, 10, 15, and 20 mol %) have been successfully synthesized by a hydrothermal method. The as-synthesized Pr-modified ceria nanocubes exhibit an enhanced oxidase-like activity on the organic dye TMB within a wide range of concentrations and durations. The oxidase activity increases with increasing Pr amounts in Pr-modified ceria nanocubes within the investigated concentration range. Meanwhile, these Pr-modified ceria nanocubes also show higher reducibility than pure ceria nanocubes. The kinetics of their oxidase mimetic activity is fitted with the Michaelis-Menten equation. A mechanism has been proposed on how the Pr incorporation could affect the energy level of the bands in ceria and hence facilitate the TMB oxidation reaction. The presence of Pr3+ species on the surface also contributes to the increasing activity of the Pr-modified ceria nanocubes present higher oxidase activity than pure ceria nanocubes.

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Citations

Feb 14, 2019·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Wei SongXiaofeng Lu
Feb 7, 2021·Materials·Adrián Barroso-BogeatJosé María Pintado
Jun 8, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Xiaoli LiuHui Wei
Nov 21, 2021·Environmental Science and Pollution Research International·Almudena AguinacoMilagrosa Ramírez-Del-Solar

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