期刊
FRONTIERS IN CHEMISTRY
卷 10, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2022.952936
关键词
vertically-ordered mesoporous silica film; mercury ion; electrochemical detection; pharmaceutical; soil
资金
- National Natural Science Foundation of China [21904117, 82160341]
- Zhejiang Provincial Natural Science Foundation of China [LY20B050007, LY21B050003]
- Guangxi Natural Science Foundation Key Project [2022GXNSFDA035060]
In this study, vertically-ordered mesoporous silica films were prepared and utilized for rapid and simple detection of mercury ions in pharmaceuticals and soil samples. The films displayed cationic selectivity and strong electrostatic interaction with Hg2+, enabling quantitative detection with a wide linear range and low limit of detection.
Rapid and simple determination of mercury ion (Hg2+) in pharmaceuticals and soil samples is vital for human health and the environmental monitoring. Vertically-ordered mesoporous silica films (VMSF) supported by the indium tin oxide (ITO) electrode surface were prepared by electrochemically assisted self-assembly method and utilized for electrochemical detection of Hg2+. Owing to the negatively charged channel walls and ultrasmall pore diameter, VMSF displays obvious cationic selectivity and has highly electrostatic interaction for Hg2+, giving rise to the strong electrochemical signals. By recording the anodic stripping signals of adsorbed Hg2+ using differential pulse voltammetry, quantitative detection of Hg2+ was achieved with a wide linear range (0.2 mu M-20 mu M) and a low limit of detection (3 nM). Furthermore, considering the anti-fouling and anti-interference capacity of VMSF, the proposed VMSF/ITO sensor has been successfully applied to detect Hg2+ in pharmaceuticals and soil samples without tedious pretreatment processes of samples.
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