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Fabrication of Electrochemical Sensor Based on CeO2−SnO2 Nanocomposite Loaded on Pd Support for Determination of Nitrite at Trace Levels
Electroanalysis ( IF 2.7 ) Pub Date : 2020-01-07 , DOI: 10.1002/elan.201900598 Aram Mahmoodi 1 , Ali A. Ensafi 1 , Behzad Rezaei 1
Electroanalysis ( IF 2.7 ) Pub Date : 2020-01-07 , DOI: 10.1002/elan.201900598 Aram Mahmoodi 1 , Ali A. Ensafi 1 , Behzad Rezaei 1
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Here, an electrochemical sensor based on CeO2‐SnO2/Pd was prepared and used for highly selective and sensitive determination of nitrite in some real samples. This nanocomposite was characterized by various methods like X‐ray photoelectron spectroscopy, X‐ray diffraction, energy dispersive spectroscopy, Fourier‐transform infrared spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy. The electrochemical behavior of the sensor was evaluated by cyclic voltammetry. The results showed excellent catalytic property of the nanocomposite as a an electrocatalyst for nitrite oxidation. In the following, the experimental parameters affecting the analytical signal for nitrite were optimized. Under the optimal conditions, the limit of detection and sensitivity of the sensor were calculated as 0.10 μM and 652.95 μA.mM−1.cm−2, respectively. Also, the response of the sensor was linear in the range of 0.36 to 2200 μM of nitrite. Finally, some of the inherent features of the sensor such as repeatability, reproducibility and stability were examined after evaluation of the sensor selectivity in the presence of several interfering species.
中文翻译：
基于负载在钯载体上的CeO2-SnO2纳米复合材料的电化学传感器的制备，用于痕量亚硝酸盐的测定
在此，基于CeO 2 -SnO 2的电化学传感器制备了/ Pd，并将其用于某些真实样品中亚硝酸盐的高选择性和灵敏测定。这种纳米复合材料的特征在于多种方法，例如X射线光电子能谱，X射线衍射，能量色散谱，傅里叶变换红外光谱，场发射扫描电子显微镜和透射电子显微镜。通过循环伏安法评估传感器的电化学行为。结果表明，该纳米复合材料作为亚硝酸盐氧化的电催化剂具有优异的催化性能。接下来，优化影响亚硝酸盐分析信号的实验参数。在最佳条件下，传感器的检测极限和灵敏度分别计算为0.10μM和652.95μA.mM- 1 .cm-2。同样，传感器的响应在亚硝酸盐范围为0.36至2200μM的范围内是线性的。最后，在几种干扰物质存在下评估传感器的选择性之后，检查了传感器的某些固有特征，例如重复性，再现性和稳定性。
更新日期：2020-01-07
中文翻译：
基于负载在钯载体上的CeO2-SnO2纳米复合材料的电化学传感器的制备，用于痕量亚硝酸盐的测定
在此，基于CeO 2 -SnO 2的电化学传感器制备了/ Pd，并将其用于某些真实样品中亚硝酸盐的高选择性和灵敏测定。这种纳米复合材料的特征在于多种方法，例如X射线光电子能谱，X射线衍射，能量色散谱，傅里叶变换红外光谱，场发射扫描电子显微镜和透射电子显微镜。通过循环伏安法评估传感器的电化学行为。结果表明，该纳米复合材料作为亚硝酸盐氧化的电催化剂具有优异的催化性能。接下来，优化影响亚硝酸盐分析信号的实验参数。在最佳条件下，传感器的检测极限和灵敏度分别计算为0.10μM和652.95μA.mM- 1 .cm-2。同样，传感器的响应在亚硝酸盐范围为0.36至2200μM的范围内是线性的。最后，在几种干扰物质存在下评估传感器的选择性之后，检查了传感器的某些固有特征，例如重复性，再现性和稳定性。
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