In this present scenario, for the first time, we propose a facile and simple wet chemical approach for the fabrication of two-dimensional (2D) cerium tungstate (CeW2O9;CeW) nanosheets and evaluated as an electrochemical sensor for the detection of nitrite ions. The successful formation of CeW2O9 nanosheets was confirmed by various physicochemical techniques such as X-ray diffraction, Fourier transform infrared spectroscopy, Raman, Scanning electron microscope, Transmission electron microscope and Energy dispersive X-ray studies. The electrochemical properties of the CeW nanosheets were studied by using cyclic voltammograms (CV) and chronoamperometric techniques. As an electrochemical sensor, the CeW nanosheets modified glassy carbon electrode (GCE) showed superior electrocatalytic activity in the oxidation of nitrite in terms of higher anodic peak current and lower oxidation potential when compared with unmodified GCE. CeW nanosheets based electrochemical sensor has been fabricated which detect nitrite in wide linear response range, good sensitivity and very low detection limit of 0.02–986 μM, 2.85 μA μM−1 cm−2 and 8 nM, respectively. Moreover, the CeW nanosheets modified GCE exhibited excellent selectivity even in the presence of common metal ions and biologically co-interfering compounds. For the practical viability of the prepared amperometric sensor has been utilized in various water samples such as tap, lake and drinking water and the obtained recoveries are appreciable.

中文翻译：

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一种用于有效电化学检测致癌亚硝酸根离子的新型钨酸铈纳米片修饰电极

在这种情况下，我们首次提出了一种简便易行的湿化学方法来制造二维 (2D) 钨酸铈 (CeW2O9;CeW) 纳米片，并被评估为用于检测亚硝酸根离子的电化学传感器。CeW2O9 纳米片的成功形成得到了各种物理化学技术的证实，如 X 射线衍射、傅里叶变换红外光谱、拉曼、扫描电子显微镜、透射电子显微镜和能量色散 X 射线研究。通过使用循环伏安图 (CV) 和计时电流法技术研究了 CeW 纳米片的电化学性质。作为电化学传感器，与未改性的 GCE 相比，CeW 纳米片改性的玻璃碳电极 (GCE) 在更高的阳极峰值电流和更低的氧化电位方面显示出优异的亚硝酸盐氧化电催化活性。已经制造了基于 CeW 纳米片的电化学传感器，该传感器可在宽线性响应范围内检测亚硝酸盐，具有良好的灵敏度和非常低的检测限，分别为 0.02–986 μM、2.85 μA μM-1 cm-2 和 8 nM。此外，即使在常见金属离子和生物共干扰化合物存在的情况下，CeW 纳米片修饰的 GCE 也表现出优异的选择性。由于制备的电流传感器的实际可行性已用于各种水样，例如自来水、湖泊和饮用水，并且获得的回收率是可观的。