Department of Energy and Materials Engineering, Dongguk University, Seoul 100-715, Republic of Korea.
Department of Biological Engineering, NanoBio High-Tech Materials Research Center, Inha University, Incheon 22212, Republic of Korea.
J Hazard Mater. 2021 Apr 15;408:124914. doi: 10.1016/j.jhazmat.2020.124914. Epub 2020 Dec 20.
The improper disposal in agricultural and industrial wastewater leads to high NO concentrations in the aquatic environment, which can cause cancer in humans and animals; thus, their quick and accurate detection is urgently needed to ensure public health and environmental safety. In this study, a reliable and selective electrochemical sensor consisting of Pd-Cu nanospheres (NSs) supported on molybdenum carbide was prepared via simple ultrasonication. Then, a glassy carbon electrode was realized using this composite (Pd-Cu-MoC-modified GCE) to test its electrocatalytic sensing for NO in a 0.1 M phosphate-buffered solution (PBS) solution via cyclic voltammetry and amperometry; at a low oxidation potential, the anodic peak current of NO detected by this electrode was significantly higher than that of its unmodified and other modified electrodes. The sensor showed a broad linear response in the 5-165-nM NO concentration range, with a low detection limit (0.35 nM in 0.1 M PBS) and high sensitivity (3.308 μAnM cm). Moreover, the fabricated electrode was successfully applied for detecting nitrites in sausages, river water, and milk, showing also good recovery.
农业和工业废水中的不当处理会导致水中的硝酸盐浓度过高，从而对人类和动物的健康造成威胁。因此，需要快速、准确地检测硝酸盐，以确保公众健康和环境安全。本研究通过简单的超声法制备了一种由负载在碳化钼上的钯-铜纳米球（NSs）组成的可靠且选择性的电化学传感器。然后，使用该复合材料（Pd-Cu-MoC 修饰的 GCE）制备了玻碳电极，通过循环伏安法和安培法在 0.1 M 磷酸盐缓冲溶液（PBS）中测试其对 NO 的电催化传感性能；在较低的氧化电位下，该电极检测到的 NO 的阳极峰电流明显高于未修饰电极和其他修饰电极的电流。该传感器在 5-165 nM 的 NO 浓度范围内具有较宽的线性响应，检测限低（0.1 M PBS 中的 0.35 nM），灵敏度高（3.308 μAnM cm）。此外，所制备的电极还成功地应用于香肠、河水和牛奶中亚硝酸盐的检测，回收率也较好。
