Electrochemical Detection of As (III) on a Manganese Oxide-Ceria (Mn2 O3 /CeO2 ) Nanocube Modified Au Electrode,Electroanalysis

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Electrochemical Detection of As (III) on a Manganese Oxide-Ceria (Mn2 O3 /CeO2 ) Nanocube Modified Au Electrode
Electroanalysis ( IF 2.7 ) Pub Date : 2018-02-19 , DOI: 10.1002/elan.201700662
Baiyu Ren ₁ , Putla Sudarsanam _{1,

2} , Ahmad Esmaielzadeh Kandjani ₁ , Brendan Hillary ₁ , Mohamad Hassan Amin ₁ , Suresh K. Bhargava ₁ , Lathe A. Jones ₁

Affiliation

Ceria cubes decorated with manganese oxide nanoparticles (Mn2O3/CeO2 nanocubes) were synthesized and used to modify a Au electrode for analysis of As(III) in aqueous solution. This modified electrode displayed improved sensitivity than either oxide on their own, indicating a synergistic effect due to the effect of Mn2O3 on the properties of CeO2. The improved sensitivity could be ascribed to the enhanced As (III) adsorption ability of Mn2O3/CeO2 nanocube during electrochemical pre‐concentration, combined with the well known As(III) sensing qualities of the gold substrate. The Mn2O3/CeO2 nanocube modified gold electrode behaved as a promising sensor with stable, repeatable square wave anodic stripping voltammetry (SWASV) peaks, separated from common interfering ions in natural water including Cu (II) under practical conditions. Repeatability and stability studies revealed the As (III) sensor to be robust and reliable, with a sensitivity of 0.0414 μA/ppb and a limit of detection (LoD) of 3.35 ppb under optimized conditions, indicating a possible general use of this class of heteronanostructures in electroanalytical chemistry for studies that rely upon adsorption of deposition of the analyte prior to stripping analysis.

中文翻译：

在氧化锰-氧化铈 (Mn2 O3 /CeO2 ) 纳米立方体改性 Au 电极上电化学检测 As (III)

合成了用氧化锰纳米颗粒装饰的氧化铈立方体（Mn2O3/CeO2 纳米立方体），并用于修饰 Au 电极以分析水溶液中的 As(III)。这种改进的电极显示出比任何一种氧化物本身更高的灵敏度，表明由于 Mn2O3 对 CeO2 性能的影响而产生协同效应。灵敏度的提高可归因于 Mn2O3/CeO2 纳米立方体在电化学预浓缩过程中增强的 As (III) 吸附能力，以及众所周知的金基板的 As(III) 传感特性。Mn2O3/CeO2 纳米立方体修饰的金电极作为一种很有前途的传感器，具有稳定、可重复的方波阳极溶出伏安法 (SWASV) 峰，在实际条件下与天然水中的常见干扰离子包括 Cu (II) 分离。

更新日期：2018-02-19

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