Construction of Silver Quantum Dot Immobilized Zn-MOF-8 Composite for Electrochemical Sensing of 2,4-Dinitrotoluene
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) compos...
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MDPI AG
2019-11-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/9/22/4952 |
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| author | Sushma Rani Bharti Sharma Shivani Kapoor Rajesh Malhotra Rajender S. Varma Neeraj Dilbaghi |
| author_facet | Sushma Rani Bharti Sharma Shivani Kapoor Rajesh Malhotra Rajender S. Varma Neeraj Dilbaghi |
| author_sort | Sushma Rani |
| collection | DOAJ |
| description | 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 µA µM<sup>−1</sup> cm<sup>−2</sup>), selective, rapid and stable 2,4-DNT sensor. The dynamic linear range and limit of detection (LOD) was about 0.0002 µM to 0.9 µM and 0.041 µM, 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. |
| first_indexed | 2024-12-12T09:28:50Z |
| format | Article |
| id | doaj.art-1e1612635f8743fc82857f8328f34f28 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-12T09:28:50Z |
| publishDate | 2019-11-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj.art-1e1612635f8743fc82857f8328f34f282022-12-22T00:28:56ZengMDPI AGApplied Sciences2076-34172019-11-01922495210.3390/app9224952app9224952Construction of Silver Quantum Dot Immobilized Zn-MOF-8 Composite for Electrochemical Sensing of 2,4-DinitrotolueneSushma Rani0Bharti Sharma1Shivani Kapoor2Rajesh Malhotra3Rajender S. Varma4Neeraj Dilbaghi5Department of Chemistry, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, IndiaDepartment of Bio and Nano Technology, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, IndiaDepartment of Bio and Nano Technology, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, IndiaDepartment of Chemistry, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, IndiaDepartment of Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, Šlechtitelů 27, 783 71 Olomouc, Czech RepublicDepartment of Bio and Nano Technology, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, IndiaIn 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 µA µM<sup>−1</sup> cm<sup>−2</sup>), selective, rapid and stable 2,4-DNT sensor. The dynamic linear range and limit of detection (LOD) was about 0.0002 µM to 0.9 µM and 0.041 µM, 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.https://www.mdpi.com/2076-3417/9/22/4952naphthalene-2,6-dicarboxylic acidsilver quantum dot particleselectrochemical sensor2,4-dinitrotoluene |
| spellingShingle | Sushma Rani Bharti Sharma Shivani Kapoor Rajesh Malhotra Rajender S. Varma Neeraj Dilbaghi Construction of Silver Quantum Dot Immobilized Zn-MOF-8 Composite for Electrochemical Sensing of 2,4-Dinitrotoluene Applied Sciences naphthalene-2,6-dicarboxylic acid silver quantum dot particles electrochemical sensor 2,4-dinitrotoluene |
| title | Construction of Silver Quantum Dot Immobilized Zn-MOF-8 Composite for Electrochemical Sensing of 2,4-Dinitrotoluene |
| title_full | Construction of Silver Quantum Dot Immobilized Zn-MOF-8 Composite for Electrochemical Sensing of 2,4-Dinitrotoluene |
| title_fullStr | Construction of Silver Quantum Dot Immobilized Zn-MOF-8 Composite for Electrochemical Sensing of 2,4-Dinitrotoluene |
| title_full_unstemmed | Construction of Silver Quantum Dot Immobilized Zn-MOF-8 Composite for Electrochemical Sensing of 2,4-Dinitrotoluene |
| title_short | Construction of Silver Quantum Dot Immobilized Zn-MOF-8 Composite for Electrochemical Sensing of 2,4-Dinitrotoluene |
| title_sort | construction of silver quantum dot immobilized zn mof 8 composite for electrochemical sensing of 2 4 dinitrotoluene |
| topic | naphthalene-2,6-dicarboxylic acid silver quantum dot particles electrochemical sensor 2,4-dinitrotoluene |
| url | https://www.mdpi.com/2076-3417/9/22/4952 |
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