检出限
介孔材料
碳纤维
电极
扫描电子显微镜
解吸
拉曼光谱
化学
分析化学(期刊)
吸附
线性扫描伏安法
材料科学
伏安法
电化学
核化学
有机化学
色谱法
复合材料
催化作用
循环伏安法
物理化学
物理
光学
复合数
作者
Ying Wang,Mengfei Qiao,Yiliyas Baikeli,Xamxikamar Mamat,Lei Li,Xun Hu,Yong Dong,Fengqin Chang,Hucai Zhang,Guangzhi Hu
标识
DOI:10.1016/j.jhazmat.2019.121550
摘要
In this study, ordered mesoporous carbon (OMC) was synthesized by applying a soft template method, and its mesoporous structure was characterized by scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption–desorption techniques. X-ray diffraction and Raman spectroscopic analyses were conducted to demonstrate the high graphitization and topological defects at the sample surface. An electrochemical sensor based on an OMC-modified glassy carbon electrode (OMC/GCE) was constructed to detect aristolochic acids (AAs) using cyclic voltammetry and linear sweep voltammetry. The dependence of the experimental parameters including solution pH, scan rate, and accumulation time were examined and optimized. Under the optimal conditions, the response of OMC/GCE was linear over wide concentration ranges of AAs (0.6–10 μM and 10–50 μM), with sensitivities of −1.77 and −0.31 μA/μM, respectively. The limit of detection was calculated to be 0.186 μM (at S/N = 3). Furthermore, the proposed OMC/GCE was applied to detect AAs in Asarum sieboldini and the content of AAs was calculated to be 8.9 μg/g with high accuracy and precision. In addition, the modified electrode also exhibited good selectivity, reproducibility, and stability. Therefore, the OMC/GCE can be used as a platform for the determination of AAs.
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