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Sensitive and selective impedimetric determination of TNT using RSM-CCD optimization
Morteza Soltani-Shahrivar1, Abbas Afkhami2, Tayyebeh Madrakian1
1Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran.
Talanta
|February 21, 2023
Summary
A new, inexpensive electrochemical sensor detects trace amounts of 2,4,6-Trinitrotoluene (TNT) using modified magnetic multiwalled carbon nanotubes. This sensor offers high sensitivity and selectivity for explosive detection in environmental samples.
Area of Science:
- Electrochemistry
- Materials Science
- Environmental Science
Background:
- 2,4,6-Trinitrotoluene (TNT) detection is crucial for security and environmental safety.
- Conventional methods for TNT detection lack sensitivity and selectivity or require complex procedures.
- Electrochemical impedance spectroscopy (EIS) offers high sensitivity but electrode modification remains a challenge.
Purpose of the Study:
- To develop an inexpensive, simple, sensitive, and selective impedimetric electrochemical sensor for TNT detection.
- To utilize magnetic multiwalled carbon nanotubes modified with aminopropyl triethoxysilane (MMWCNTs @ APTES) for TNT sensing.
- To investigate the sensor's performance and optimize detection conditions.
Main Methods:
- Fabrication of a sensor using MMWCNTs @ APTES modified electrodes.
- Utilizing the formation of a Meisenheimer complex between TNT and the modified electrode surface.
- Employing electrochemical impedance spectroscopy (EIS) to measure changes in charge transfer resistance (ΔRCT).
- Applying response surface methodology (RSM-CCD) to optimize sensor parameters (pH, contact time, modifier percentage).
Main Results:
- The sensor demonstrated a sensitive and selective response to TNT.
- Optimal conditions were determined as pH 8.29, contact time 479 s, and 12.38% modifier.
- A wide linear range (1-500 nM) and a low detection limit (0.15 nM) were achieved.
- The sensor showed no significant interference from other nitroaromatic compounds.
- Successful application in detecting TNT in real water samples with satisfactory recovery.
Conclusions:
- The developed impedimetric electrochemical sensor based on MMWCNTs @ APTES is a promising tool for sensitive and selective TNT detection.
- The sensor offers a cost-effective and simple alternative to conventional methods.
- The sensor's ability to detect TNT in water samples highlights its practical applicability for environmental monitoring.
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