基于Pd/MWCNTs/玻碳电极的电化学传感器检测水样中的羟胺

Determination of hydroxylamine in water samples by electrochemical sensor based on Pd/MWCNTs/glassy carbon electrode

中文关键词:  钯纳米颗粒  纳米复合材料  羟胺  电化学传感器

英文关键词:palladium nanoparticles  carbon nanotubes  hydroxylamine  electrochemical sensor

中文摘要:

      目的 采用Pd/MWCNTs纳米复合材料修饰玻碳电极(glassy carbon electrode, GCE)构建电化学传感器, 检测水样中羟胺(NH2OH)的含量。方法 采用乙二醇还原法制备Pd纳米颗粒负载于碳纳米管上制备Pd/MWCNTs纳米材料, 运用X射线衍射 (X-ray diffraction, XRD)和透射电子显微镜(transmission electron microscopy, TEM)对材料进行表征, 构建基于Pd/MWCNTs/GCE的电化学传感器检测羟胺。结果 在优化的工作条件下, Pd/MWCNTs纳米复合材料修饰电极检测羟胺线性检测范围2.0 μmol/L~1.4 mmol/L, 检出限达0.60 μmmol/L (S/N=3), 灵敏度为55.43 μA mmol/L, 是MWCNTs修饰电极检测灵敏度的7.5倍左右。结论 本方法制备的传感器检测羟胺具有灵敏度高、线性范围宽、检出限低的特点, 适用于抗氧化剂羟胺的检测。

英文摘要:

      Objective To prepare electrochemical sensor based on Pd/MWCNTs nanocomposites modified glassy carbon electrcode for the detection of hydroxylamine in water samples. Methods Prepared Pd nanoparticles by the ethylene glycol reduction method and then loaded on carbon nanotubes to get Pd/MWCNTs nanomaterials. The prepared materials were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), and an electrochemical sensor based on Pd/MWCNTs/GCE was constructed for the detection of hydroxylamine. Results Under optimized working conditions, the Pd/MWCNTs nanocomposite modified electrode detected hydroxylamine with a linear detection range of 2.0 μmol/L-1.4 mmol/L, and the limit of detection was 0.60 μmmol/L. The sensitivity was 55.43 μA/mmol/L, which was about 7.5 times of the detection sensitivity of MWCNTs modified electrode. Conclusion The sensor prepared by this method has the characteristics of high sensitivity, wide linear range and low detection limit, which is suitable for the detection of antioxidant hydroxylamine.