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Sensitive electrochemical platform for trace determination of Pb2+ based on multilayer Bi-MOFs/reduced graphene oxide films modified electrode
Microchimica Acta ( IF 5.3 ) Pub Date : 2020-10-10 , DOI: 10.1007/s00604-020-04571-6 Jin Zou 1, 2 , Wei Zhong 2 , Feng Gao 2 , Xiaolong Tu 2 , Shangxing Chen 1 , Xigen Huang 1, 2 , Xiaoqiang Wang 2 , Limin Lu 1, 2 , Yongfang Yu 2
Microchimica Acta ( IF 5.3 ) Pub Date : 2020-10-10 , DOI: 10.1007/s00604-020-04571-6 Jin Zou 1, 2 , Wei Zhong 2 , Feng Gao 2 , Xiaolong Tu 2 , Shangxing Chen 1 , Xigen Huang 1, 2 , Xiaoqiang Wang 2 , Limin Lu 1, 2 , Yongfang Yu 2
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A multilayer Bi-BTC/reduced graphene oxide (Bi-BTC/rGO) (BTC, 1,3,5-benzenetricarboxylic acid) film electrode was adopted to construct a highly sensitive Pb2+ electrochemical sensor. The multilayer Bi-BTC/rGO films were prepared via alternate cast of Bi-BTC and graphene oxide (GO) on a glassy carbon electrode, followed by electro-reduction of the GO components. Bi-BTC has porous broom-like structure and its organic ligand has abundant functional groups, which are favorable for Pb2+ adsorption and preconcentration. The introduction of rGO layer improves the conductivity of the MOFs material. Moreover, the multilayer composite structure greatly increased the exposure of active sites and the surface area of reactive contact, finally realizing the highly sensitive detection of Pb2+. Pb2+ was determined by differential pulse anodic stripping voltammetry and the response current was recorded at − 0.62 V. The [Bi-BTC/rGO]2 electrode provides a wide linear response ranging from 0.062 to 20.72 μg/L and a low limit of detection (LOD) of 0.021 μg/L (S/N = 3) for Pb2+, which is lower than the guideline value proposed by the World Health Organization. The method has been applied to determine Pb2+ in industrial wastewater with recoveries of 99.2–104% and RSDs of 3.4–4.0% (n = 3). Graphical abstract Graphical abstract Schematic representation of an electrochemical sensor for the detection of Pb2+ was designed based on long broom-like structure bismuth(II) metallic organic framework/reduced graphene oxide ([Bi-BTC /rGO]2) Graphical abstract Graphical abstract Schematic representation of an electrochemical sensor for the detection of Pb2+ was designed based on long broom-like structure bismuth(II) metallic organic framework/reduced graphene oxide ([Bi-BTC /rGO]2)
中文翻译：
基于多层Bi-MOFs/还原氧化石墨烯薄膜修饰电极的用于痕量Pb2+测定的灵敏电化学平台
采用多层Bi-BTC/还原氧化石墨烯（Bi-BTC/rGO）（BTC，1,3,5-苯三甲酸）薄膜电极构建高灵敏度Pb2+电化学传感器。通过在玻碳电极上交替浇铸 Bi-BTC 和氧化石墨烯 (GO)，然后对 GO 组分进行电还原，制备多层 Bi-BTC/rGO 薄膜。Bi-BTC具有多孔的扫帚状结构，其有机配体具有丰富的官能团，有利于Pb2+的吸附和富集。rGO 层的引入提高了 MOFs 材料的导电性。此外，多层复合结构大大增加了活性位点的暴露和反应接触的表面积，最终实现了对Pb2+的高灵敏度检测。Pb2+ 由差分脉冲阳极溶出伏安法测定，响应电流记录在 - 0.62 V。[Bi-BTC/rGO]2 电极提供了范围从 0.062 到 20.72 μg/L 的宽线性响应和低检测限（ Pb2+ 的 LOD) 为 0.021 μg/L (S/N = 3)，低于世界卫生组织提出的指导值。该方法已用于测定工业废水中的 Pb2+，回收率为 99.2-104%，RSD 为 3.4-4.0% (n = 3)。
更新日期：2020-10-10
中文翻译：
基于多层Bi-MOFs/还原氧化石墨烯薄膜修饰电极的用于痕量Pb2+测定的灵敏电化学平台
采用多层Bi-BTC/还原氧化石墨烯（Bi-BTC/rGO）（BTC，1,3,5-苯三甲酸）薄膜电极构建高灵敏度Pb2+电化学传感器。通过在玻碳电极上交替浇铸 Bi-BTC 和氧化石墨烯 (GO)，然后对 GO 组分进行电还原，制备多层 Bi-BTC/rGO 薄膜。Bi-BTC具有多孔的扫帚状结构，其有机配体具有丰富的官能团，有利于Pb2+的吸附和富集。rGO 层的引入提高了 MOFs 材料的导电性。此外，多层复合结构大大增加了活性位点的暴露和反应接触的表面积，最终实现了对Pb2+的高灵敏度检测。Pb2+ 由差分脉冲阳极溶出伏安法测定，响应电流记录在 - 0.62 V。[Bi-BTC/rGO]2 电极提供了范围从 0.062 到 20.72 μg/L 的宽线性响应和低检测限（ Pb2+ 的 LOD) 为 0.021 μg/L (S/N = 3)，低于世界卫生组织提出的指导值。该方法已用于测定工业废水中的 Pb2+，回收率为 99.2-104%，RSD 为 3.4-4.0% (n = 3)。
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