期刊
APPLIED SCIENCES-BASEL
卷 9, 期 22, 页码 -出版社
MDPI
DOI: 10.3390/app9224952
关键词
naphthalene-2; 6-dicarboxylic acid; silver quantum dot particles; electrochemical sensor; 2; 4-dinitrotoluene
类别
资金
- Council of Scientific and Industrial Research (CSIR), New Delhi [09/752(0057)/2014/EMR-1]
- Life Science Research Board-Defence Research and Development Organization
- Operational Programme Research, Development and Education - European Regional Development Fund of the Ministry of Education - Youth and Sports of the Czech Republic [CZ.02.1.01/0.0/0.0/16_019/0000754]
In the present study, we report a highly effective electrochemical sensor for detecting 2,4-dinitrotoluene (2,4-DNT). The amperometric determination of 2,4-DNT was carried out using a gold electrode modified with zinc-metal organic framework-8 and silver quantum dot (Zn-MOF-8@AgQDs) composite. The synthesized nanomaterials were characterized by using transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD). The synthesized nanocomposite proved to be efficient in electro-catalysis thereby reducing the 2,4-DNT. The unique combination present in Zn-MOF-8@AgQDs composite offered an excellent conductivity and large surface area enabling the fabrication of a highly sensitive (-0.238 mu A mu M-1 cm(-2)), selective, rapid and stable 2,4-DNT sensor. The dynamic linear range and limit of detection (LOD) was about 0.0002 mu M to 0.9 mu M and 0.041 mu M, respectively. A 2,4-DNT reduction was also observed during the linear sweep voltammetry (LSV) experiments with reduction peaks at -0.49 V and -0.68 V. This is an unprecedented report with metal organic framework (MOF) composite for sensing 2,4-DNT. In addition, the presence of other species such as thiourea, urea, ammonia, glucose, and ascorbic acid displayed no interference in the modified electrode suggesting its practicability in various environmental applications.
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