Detection of trace nitroaromatic isomers using indium tin oxide electrodes modified using β-cyclodextrin and silver...

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Materials Science

Background:

• Nitroaromatic compounds are common environmental pollutants.
• Accurate detection methods are crucial for environmental safety.
• Composite materials offer enhanced sensing capabilities.

Purpose of the Study:

• To develop a selective electrochemical sensor for nitroaromatic compounds.
• To utilize β-cyclodextrin/silver nanoparticle composites for enhanced detection.
• To investigate the sensor's performance with various nitroaromatic isomers.

Main Methods:

• Fabrication of β-cyclodextrin/silver nanoparticle composite modified ITO electrodes.
• Electrochemical determination of nitroaromatic compounds in aqueous solutions.
• Analysis of reduction potentials and binding affinities.

Main Results:

• The sensor detected various nitroaromatic compounds with distinct reduction peaks (-550 to -913 mV).
• Demonstrated selectivity for specific isomers, notably 4-nitroaniline and 1-chloro-2-nitrobenzene.
• Showed a preference for nitroaromatic compounds with stronger complexation to β-cyclodextrin.

Conclusions:

• The developed sensor is effective for detecting and differentiating nitroaromatic compounds.
• The β-cyclodextrin/silver nanoparticle composite enhances sensor selectivity and sensitivity.
• This method holds promise for environmental monitoring of nitroaromatic pollutants.