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Fe3O4@PDA@MnO2 core-shell nanocomposites for sensitive electrochemical detection of trace Pb(II) in water
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.jelechem.2020.114065
Lilian Wang , Ting Lei , Zixuan Ren , Xue Jiang , Xiangjun Yang , Huiping Bai , Shixiong Wang

Abstract In this study, Fe3O4@PDA@MnO2 core-shell magnetic nanocomposites were synthesized for the first time, and used to enrich target analyte to construct an electrochemical sensor for sensitive detection of trace Pb(II) in the environmental samples. A dense polydopamine (PDA) coating was firstly formed on the surface of Fe3O4 to ensure high stability because the developed method is employed under strongly acidic conditions. Then a high adsorption capacity MnO2 shell can be simply introduced to the surface of the PDA as a result of the redox activity between PDA and KMnO4. Differential pulse voltammetry (DPV) was applied for determining target metal ions. Chemical and electrochemical factors, including quantity of Fe3O4@PDA@MnO2 nanocomposites, preconcentration solutions pH, preconcentration time and supporting electrolytes, were optimized. Under excellent conditions, the designed sensor demonstrated a linear response to Pb(II) within the range of 0.1–150 μg L−1 and with a detection limit of 0.03 μg L−1. The proposed methodology exhibited excellent performance in selectivity, sensitivity and long-term stability, and was also successfully applied to determine Pb(II) in the real water samples. This study suggested that Fe3O4@PDA@MnO2 nanocomposites are a better alternative to Pb(II) analysis resulting from its low cost, low toxicity, strong adsorption, and good reproducibility.

中文翻译:

Fe3O4@PDA@MnO2 核壳纳米复合材料用于灵敏电化学检测水中痕量 Pb(II)

摘要 本研究首次合成了Fe3O4@PDA@MnO2核壳磁性纳米复合材料,用于富集目标分析物,构建电化学传感器对环境样品中痕量Pb(II)进行灵敏检测。首先在 Fe3O4 表面形成致密的聚多巴胺 (PDA) 涂层,以确保高稳定性,因为所开发的方法是在强酸性条件下使用的。然后,由于 PDA 和 KMnO4 之间的氧化还原活性,可以将高吸附容量的 MnO2 壳简单地引入到 PDA 表面。差分脉冲伏安法 (DPV) 用于测定目标金属离子。优化了化学和电化学因素,包括 Fe3O4@PDA@MnO2 纳米复合材料的数量、预浓缩溶液的 pH 值、预浓缩时间和支持电解质。在极好的条件下,设计的传感器在 0.1–150 μg L-1 范围内对 Pb(II) 表现出线性响应,检测限为 0.03 μg L-1。所提出的方法在选择性、灵敏度和长期稳定性方面表现出优异的性能,并且还成功应用于测定实际水样中的 Pb(II)。该研究表明 Fe3O4@PDA@MnO2 纳米复合材料由于其低成本、低毒性、强吸附性和良好的重现性,是 Pb(II) 分析的更好替代品。并成功应用于实际水样中Pb(II)的测定。该研究表明 Fe3O4@PDA@MnO2 纳米复合材料由于其低成本、低毒性、强吸附性和良好的重现性,是 Pb(II) 分析的更好替代品。并成功应用于实际水样中Pb(II)的测定。该研究表明 Fe3O4@PDA@MnO2 纳米复合材料由于其低成本、低毒性、强吸附性和良好的重现性,是 Pb(II) 分析的更好替代品。
更新日期:2020-05-01
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