Meng Xiangren, Xiao Xiao, Pang Huan
School of Tourism and Culinary Science, Yangzhou University, Yangzhou, China.
Jiangsu Huai-yang Cuisine Engineering Center, Yangzhou University, Yangzhou, China.
Front Chem. 2020 Apr 23;8:330. doi: 10.3389/fchem.2020.00330. eCollection 2020.
In this paper, the Ni/NiO ultrathin nanobelts were successively synthesized by a facile in suit conversion process using pre-synthesized Ni-based metal-organic frameworks (MOFs) nanobelts as parent materials to detect the nitrite (NaNO). The synthesized Ni/NiO composites have the advantages in structure, as follows: (I) Interleaved 3D reticulated structure has strong mechanical stability; (II) Ultrathin nanobelt structures allow more active sites to be exposed and make the transfer of charge faster; (III) A large number of ultrafine Ni nanoparticles decorate the building blocks of the NiO nanobelt and enhance the electrical conductivity. Ni/NiO/GCE has an obvious oxidation peak at 0.78 V, when the concentration is between 0.5 and 1000 μM, the oxidation peak current of NaNO is linearly related to the concentration, and the sensitivity is 1.5319 μA mM cm (S/N = 3). Moreover, the experimental results also concluded that the Ni/NiO ultrathin nanobelts not only indicated wonderful reproducibility in the determination of NaNO in the pickled pork samples, but also could be well-recovered and keep stable for a long time.
在本文中，以预先合成的镍基金属有机框架（MOF）纳米带作为母体材料，通过简便的原位转化过程成功合成了Ni/NiO超薄纳米带，用于检测亚硝酸盐（NaNO₂）。合成的Ni/NiO复合材料在结构上具有以下优势：（I）交错的三维网状结构具有很强的机械稳定性；（II）超薄纳米带结构使更多的活性位点得以暴露，电荷转移更快；（III）大量超细镍纳米颗粒修饰在NiO纳米带的结构单元上，提高了电导率。Ni/NiO修饰玻碳电极（GCE）在0.78 V处有明显的氧化峰，当浓度在0.5至1000 μM之间时，NaNO₂的氧化峰电流与浓度呈线性关系，灵敏度为1.5319 μA mM⁻¹ cm⁻²（信噪比S/N = 3）。此外，实验结果还表明，Ni/NiO超薄纳米带不仅在腌制猪肉样品中NaNO₂的测定中表现出出色的重现性，而且回收率良好，可长时间保持稳定。
