Sensitive electrochemical detection of As(III) in soil based on CoFe2O4/ AuNPs/IL nanocomposite modified electrode: Insight into the sensing mechanism of a dual electrocatalysis system

文献类型： 外文期刊

第一作者： Chen, Shaowen

作者： Chen, Shaowen;Lv, Cheng;Zhang, Shijie;Zhao, Guo;Li, Haonan;He, Renjie;Feng, Liya;Zhao, Xiande;Zhao, Xiande

作者机构：

关键词： Arsenic; Electrochemical detection; Square wave anodic stripping voltammetry; Soil; CoFe2O4/AuNPs/IL

期刊名称：MICROCHEMICAL JOURNAL （ 影响因子：5.1； 五年影响因子：4.7 ）

ISSN： 0026-265X

年卷期： 2024 年 203 卷

页码：

收录情况： SCI

摘要： In this study, a CoFe2O4/AuNPs/IL (ionic liquids) nanocomposite modified glassy carbon electrode (GCE) (CoFe2O4/AuNPs/IL/GCE) was developed as an electrochemical sensor for the sensitive detection of As(III) in soil using square wave anodic stripping voltammetry (SWASV). Taking advantages of the catalytic systems of AuNPs, Fe(II)/Fe(III), and Co(II)/Co(III), along with the excellent adsorption capability of CoFe2O4 and the good conductivity of the IL, the proposed sensor exhibited an enhanced detection performance toward As(III). Additionally, the relevant parameters affecting the stripping peak current of As(III) were optimized, resulting in a detection limit of 0.22 ppb (S/N = 3) and a sensitivity of 0.69 mu A ppb-1. Furthermore, the interference of high concentrations of nontarget ions on the peak current of As(III) was evaluated, wherein the current change rate was less than 10 %. Moreover, the developed sensor exhibited good stability and reusability with a relative standard deviation (RSD) of 1.44 % after repeating the measurements five times. The probable mechanism of the enhanced stripping signal based on a dual electrocatalysis system was investigated by X-ray photoelectron spectroscopy (XPS). Finally, the proposed CoFe2O4/AuNPs/IL/GCE sensor was successfully applied to the detection of As(III) in real soil samples, which demonstrated its good practical utility for the accurate detection of As(III) in environmental monitoring.

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